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What use is an 829B tube?
Hi all,
I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave |
"Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave The last rig I saw using an 829 was about 35 to 50 watts in the 50 to 70 MHZ range. Makes a good 2 Meter amp. Nice tube. Not QRP IMO... I have three of them around here somewhere. |
"Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave The last rig I saw using an 829 was about 35 to 50 watts in the 50 to 70 MHZ range. Makes a good 2 Meter amp. Nice tube. Not QRP IMO... I have three of them around here somewhere. |
"Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. They are WWII military tubes. As you surmised, mostly for VHF work. The smaller cousin was the 832B tube, used in the SCR-522 transmitter (driver, PA stages). A very popular conversion for 2-meter AM through the 50s and early 60s. The modern version of the 829 is the 5894 power tube. Pete |
"Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. They are WWII military tubes. As you surmised, mostly for VHF work. The smaller cousin was the 832B tube, used in the SCR-522 transmitter (driver, PA stages). A very popular conversion for 2-meter AM through the 50s and early 60s. The modern version of the 829 is the 5894 power tube. Pete |
I just found several 829B tubes - believe it or not in my garage - I
must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. They are about the same as a pair of 6146 tubes in one envelope but are more efficient at higher frequencies. Good for about 100 watts out at 2 meters and somewhat ueuable at 440 mhz. I think the old VHV book had an amp in it for 144 mhz that was rated for about 40 watts out on AM and more on CW/SSB. |
I just found several 829B tubes - believe it or not in my garage - I
must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. They are about the same as a pair of 6146 tubes in one envelope but are more efficient at higher frequencies. Good for about 100 watts out at 2 meters and somewhat ueuable at 440 mhz. I think the old VHV book had an amp in it for 144 mhz that was rated for about 40 watts out on AM and more on CW/SSB. |
They also make good push-pull stereo amps :-)
-- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
They also make good push-pull stereo amps :-)
-- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
Motorola used them in the "K" strip series of transmitters....60 watts at
150Mhz. Usually driven with a 2E26. That tube with 700 Volts on the plates would make that kind of power all day...Eddie "Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave |
Motorola used them in the "K" strip series of transmitters....60 watts at
150Mhz. Usually driven with a 2E26. That tube with 700 Volts on the plates would make that kind of power all day...Eddie "Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave |
Dave wrote:
I just found several 829B tubes - believe it or not in my garage... So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. You've gotten some good responses from some others in the NG. The most unusual application for the 829B that I saw was their being used to drive the magnetic-core memory modules in the Whirlwind I computer racks on display in the Computer Museum in Boston. The sockets may have originally been designed for 832's and "upgraded" to 829's for more drive or longer life. Jim Bromley, K7JEB Glendale, AZ |
Dave wrote:
I just found several 829B tubes - believe it or not in my garage... So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. You've gotten some good responses from some others in the NG. The most unusual application for the 829B that I saw was their being used to drive the magnetic-core memory modules in the Whirlwind I computer racks on display in the Computer Museum in Boston. The sockets may have originally been designed for 832's and "upgraded" to 829's for more drive or longer life. Jim Bromley, K7JEB Glendale, AZ |
they are 2 ea 6l6 tubes in 1 envelope and were used for a lot of vhf
transmitters you get 40 to 60 watts in a class c fm transmitter. "Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave |
they are 2 ea 6l6 tubes in 1 envelope and were used for a lot of vhf
transmitters you get 40 to 60 watts in a class c fm transmitter. "Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave |
On Fri, 06 Feb 2004 01:03:55 GMT, "Dave" wrote:
|Hi all, | |I just found several 829B tubes - believe it or not in my garage - I |must have got them in a box of stuff at a ham fest at one time. |A check on Ebay shows they're pretty much worthless for the sake |of dollars, but they're so COOL! With the two plate caps that are |actually just stiff pins, they look like little Martians. | |I put a pair on my office credenza just to look geeky cool. Fresh |out of the box as NOS they look amazing - just like they were made |yesterday. It's a pity they have no value - maybe as a homebrew |project?? | |So can someone tell me what they would have been used for? |Something tells me they're a VHF power tube. | |Any application as a one-tube QRP rig of any sort? Any stories |about using them in the past? I've built a lot of little rigs over the |years, but never knew about the 829 I used one on two meters in the early 60's. The amp was of course push-pull and had a tuned line plate circuit with link coupling. I ran AM and CW and used the modulated high voltage out of my Heathkit DX-100 for plate and screen voltage. The original exciter was a converted SCR-522, which used the 829's baby brother, the 832 as frequency multipliers and final. Later I replaced the 829 with a 5894 and the 832s with a baby version of the '94, whose part number escapes me at the moment (6907 I think). These later tubes were more efficient at vhf and were tetrodes rather than the 832-829 "beam-power" tubes. The 832 was sort of like a pair of 2E26s sharing a cathode and the 829 was sort of like a pair of 807s. Eventually, I replaced the clunky '522 with a more compact exciter out of the Handbook that used somethin' or the other as oscillator/doubler/tripler and a 6360 tripler driving another 6360. Real progress came when I converted the second 6360 to a high level mixer driven with a Central Electronics 10A SSB exciter. (I don't even want to think what the IMD out of this mess must have been.) |
On Fri, 06 Feb 2004 01:03:55 GMT, "Dave" wrote:
|Hi all, | |I just found several 829B tubes - believe it or not in my garage - I |must have got them in a box of stuff at a ham fest at one time. |A check on Ebay shows they're pretty much worthless for the sake |of dollars, but they're so COOL! With the two plate caps that are |actually just stiff pins, they look like little Martians. | |I put a pair on my office credenza just to look geeky cool. Fresh |out of the box as NOS they look amazing - just like they were made |yesterday. It's a pity they have no value - maybe as a homebrew |project?? | |So can someone tell me what they would have been used for? |Something tells me they're a VHF power tube. | |Any application as a one-tube QRP rig of any sort? Any stories |about using them in the past? I've built a lot of little rigs over the |years, but never knew about the 829 I used one on two meters in the early 60's. The amp was of course push-pull and had a tuned line plate circuit with link coupling. I ran AM and CW and used the modulated high voltage out of my Heathkit DX-100 for plate and screen voltage. The original exciter was a converted SCR-522, which used the 829's baby brother, the 832 as frequency multipliers and final. Later I replaced the 829 with a 5894 and the 832s with a baby version of the '94, whose part number escapes me at the moment (6907 I think). These later tubes were more efficient at vhf and were tetrodes rather than the 832-829 "beam-power" tubes. The 832 was sort of like a pair of 2E26s sharing a cathode and the 829 was sort of like a pair of 807s. Eventually, I replaced the clunky '522 with a more compact exciter out of the Handbook that used somethin' or the other as oscillator/doubler/tripler and a 6360 tripler driving another 6360. Real progress came when I converted the second 6360 to a high level mixer driven with a Central Electronics 10A SSB exciter. (I don't even want to think what the IMD out of this mess must have been.) |
Many thanks to all who replied, both here and by email.
They sound like a great tube for LOTS of purposes. My favorite suggestion was building a regen, using each half in place of the 6AQ5's called for in the ARRL handbook design from the 50's! How about an oscillator / amplifier for HF, running low plate voltage for a relatively low RF output? Seems they should be able to do that - and having a separate oscillator stage it wouldn't be prone to runaway and exessive crystal current. And it would look VERY cool! What sort of plate caps were used? There are just pins, and it looks almost as if there would have been a ceramic gizmo like a tube socket to have bridged the two of them.... Again, thanks for the info!! Dave |
Many thanks to all who replied, both here and by email.
They sound like a great tube for LOTS of purposes. My favorite suggestion was building a regen, using each half in place of the 6AQ5's called for in the ARRL handbook design from the 50's! How about an oscillator / amplifier for HF, running low plate voltage for a relatively low RF output? Seems they should be able to do that - and having a separate oscillator stage it wouldn't be prone to runaway and exessive crystal current. And it would look VERY cool! What sort of plate caps were used? There are just pins, and it looks almost as if there would have been a ceramic gizmo like a tube socket to have bridged the two of them.... Again, thanks for the info!! Dave |
To see the tube photo -- go to googe.com type in "829B tubes"
Select IMAGES not web. I recall these in Military Aircraft of the 50's --- I believe ARC-27 -- a UHF Transceiver by Collins Radio The ARC-1 Transceiver used a smaller rounded version 832B -- we called them door knob tubes -- see google So would make a VHF/UHF power output stage maybe 10 watts or so -- 73- Cambio - Keyboard To You (:-) ----------------------------------- "Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave |
To see the tube photo -- go to googe.com type in "829B tubes"
Select IMAGES not web. I recall these in Military Aircraft of the 50's --- I believe ARC-27 -- a UHF Transceiver by Collins Radio The ARC-1 Transceiver used a smaller rounded version 832B -- we called them door knob tubes -- see google So would make a VHF/UHF power output stage maybe 10 watts or so -- 73- Cambio - Keyboard To You (:-) ----------------------------------- "Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave |
In UcPUb.7963$IF1.3703@fed1read01 (rec.radio.amateur.boatanchors), Cambio wrote:
To see the tube photo -- go to googe.com type in "829B tubes" Select IMAGES not web. I recall these in Military Aircraft of the 50's --- I believe ARC-27 -- a UHF Transceiver by Collins Radio The ARC-1 Transceiver used a smaller rounded version 832B -- we called them door knob tubes -- see google So would make a VHF/UHF power output stage maybe 10 watts or so They were the final in the TX of the AN/ARC-3, too. I never got mine lit up, as I went into the USAF not long after I got mine -- surplused (or something) from the Civil Air Patrol, way back in 1964. -- Any research done on how to efficiently use computers has been long lost in the mad rush to upgrade systems to do things that aren't needed by people who don't understand what they are really supposed to do with them. -- Graham Reed, in a.s.r. |
In UcPUb.7963$IF1.3703@fed1read01 (rec.radio.amateur.boatanchors), Cambio wrote:
To see the tube photo -- go to googe.com type in "829B tubes" Select IMAGES not web. I recall these in Military Aircraft of the 50's --- I believe ARC-27 -- a UHF Transceiver by Collins Radio The ARC-1 Transceiver used a smaller rounded version 832B -- we called them door knob tubes -- see google So would make a VHF/UHF power output stage maybe 10 watts or so They were the final in the TX of the AN/ARC-3, too. I never got mine lit up, as I went into the USAF not long after I got mine -- surplused (or something) from the Civil Air Patrol, way back in 1964. -- Any research done on how to efficiently use computers has been long lost in the mad rush to upgrade systems to do things that aren't needed by people who don't understand what they are really supposed to do with them. -- Graham Reed, in a.s.r. |
In .com (rec.radio.amateur.homebrew), Dave wrote:
What sort of plate caps were used? There are just pins, and it looks almost as if there would have been a ceramic gizmo like a tube socket to have bridged the two of them.... On the transmitter for the AN/ARC-3, the plate leads just had push-on clips with a little bit of spring-loading, much like the contacts in a tube socket. -- You haven't lived until you've seen the households Great Hunter Panther^wtomcat cowering in terror under a bush after being caught in an instant thunderstorm on a sunny day. -- Lionel, about his owner, in the Monastery |
In .com (rec.radio.amateur.homebrew), Dave wrote:
What sort of plate caps were used? There are just pins, and it looks almost as if there would have been a ceramic gizmo like a tube socket to have bridged the two of them.... On the transmitter for the AN/ARC-3, the plate leads just had push-on clips with a little bit of spring-loading, much like the contacts in a tube socket. -- You haven't lived until you've seen the households Great Hunter Panther^wtomcat cowering in terror under a bush after being caught in an instant thunderstorm on a sunny day. -- Lionel, about his owner, in the Monastery |
I just found several 829B tubes - believe it or not in my garage - I
....[snip].... So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. ....[snip].... A nice article starting on page 40 of the August, 1949, issue of QST describs a two-tube (6AG7 oscillator [26MHz xtal]/doubler and 829 amplifier) for 75 watts output in the 6-meter band. --Myron. -- Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448 NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol) |
I just found several 829B tubes - believe it or not in my garage - I
....[snip].... So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. ....[snip].... A nice article starting on page 40 of the August, 1949, issue of QST describs a two-tube (6AG7 oscillator [26MHz xtal]/doubler and 829 amplifier) for 75 watts output in the 6-meter band. --Myron. -- Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448 NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol) |
In article 20GUb.14771$An3.12809@edtnps84, Gregg wrote:
They also make good push-pull stereo amps :-) I was looking at doing something like that years ago, using a homebrew output transformer, but I never finished it. I do know that the 829 was used in some of the modulation decks for aircraft band transmitters at one point, so they should be fun at AF. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
In article 20GUb.14771$An3.12809@edtnps84, Gregg wrote:
They also make good push-pull stereo amps :-) I was looking at doing something like that years ago, using a homebrew output transformer, but I never finished it. I do know that the 829 was used in some of the modulation decks for aircraft band transmitters at one point, so they should be fun at AF. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Dave wrote:
Many thanks to all who replied, both here and by email. They sound like a great tube for LOTS of purposes. My favorite suggestion was building a regen, using each half in place of the 6AQ5's called for in the ARRL handbook design from the 50's! How about an oscillator / amplifier for HF, running low plate voltage for a relatively low RF output? Seems they should be able to do that - and having a separate oscillator stage it wouldn't be prone to runaway and exessive crystal current. And it would look VERY cool! If I recall, the 829 is one of the tubes with the cathodes tied together to a single pin, isn't it? This reduces the utility for such things. What sort of plate caps were used? There are just pins, and it looks almost as if there would have been a ceramic gizmo like a tube socket to have bridged the two of them.... They are little ceramic clips. You can use Molex pins in a pinch. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Dave wrote:
Many thanks to all who replied, both here and by email. They sound like a great tube for LOTS of purposes. My favorite suggestion was building a regen, using each half in place of the 6AQ5's called for in the ARRL handbook design from the 50's! How about an oscillator / amplifier for HF, running low plate voltage for a relatively low RF output? Seems they should be able to do that - and having a separate oscillator stage it wouldn't be prone to runaway and exessive crystal current. And it would look VERY cool! If I recall, the 829 is one of the tubes with the cathodes tied together to a single pin, isn't it? This reduces the utility for such things. What sort of plate caps were used? There are just pins, and it looks almost as if there would have been a ceramic gizmo like a tube socket to have bridged the two of them.... They are little ceramic clips. You can use Molex pins in a pinch. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
That's right on! The rig was the Collins ARC-1. It used one in the final and one
in the modulator. The thing was for 100-156 MHz. Later conversions for the airlines in the late 40's added 50 or so channels (sort of like the ARC-3 and the ARC-49). snip- I was looking at doing something like that years ago, using a homebrew output transformer, but I never finished it. I do know that the 829 was used in some of the modulation decks for aircraft band transmitters at one point, so they should be fun at AF. --scott |
That's right on! The rig was the Collins ARC-1. It used one in the final and one
in the modulator. The thing was for 100-156 MHz. Later conversions for the airlines in the late 40's added 50 or so channels (sort of like the ARC-3 and the ARC-49). snip- I was looking at doing something like that years ago, using a homebrew output transformer, but I never finished it. I do know that the 829 was used in some of the modulation decks for aircraft band transmitters at one point, so they should be fun at AF. --scott |
Dave, as I recall there was a design in one of the ARRL books..... maybe VHF
manual that included an 829B. I also recall Motorola using this in a very old radio, don't remember exactly. Anyway I think it's good for 40-50 watts. I wouldn't mind having them if your looking to part with them. Clay "Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave |
Dave, as I recall there was a design in one of the ARRL books..... maybe VHF
manual that included an 829B. I also recall Motorola using this in a very old radio, don't remember exactly. Anyway I think it's good for 40-50 watts. I wouldn't mind having them if your looking to part with them. Clay "Dave" wrote in message news.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. I put a pair on my office credenza just to look geeky cool. Fresh out of the box as NOS they look amazing - just like they were made yesterday. It's a pity they have no value - maybe as a homebrew project?? So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 Thanks, Dave |
I just found several 829B tubes - believe it or not in my garage - I
snip So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 The datasheet is he http://www.mif.pg.gda.pl/homepages/f...049/8/829B.pdf A lot of The Radio Amateur's Handbooks of the '50s and '60s had 892B projects in them. The 1953 edition, immediately to my left as I write this, has "A 100-Watt RF Amplifier for 50 and 144 Mc." on page 405. It runs push-pull class-C, up to 120 Watts CW or FM, and 100 Watts AM. And the following fellow has gone to an awful lot of trouble to use two 829Bs in parallel single-ended triode mode in a stereo amplifier: http://www.pmillett.addr.com/829b_amplifier.htm |
I just found several 829B tubes - believe it or not in my garage - I
snip So can someone tell me what they would have been used for? Something tells me they're a VHF power tube. Any application as a one-tube QRP rig of any sort? Any stories about using them in the past? I've built a lot of little rigs over the years, but never knew about the 829 The datasheet is he http://www.mif.pg.gda.pl/homepages/f...049/8/829B.pdf A lot of The Radio Amateur's Handbooks of the '50s and '60s had 892B projects in them. The 1953 edition, immediately to my left as I write this, has "A 100-Watt RF Amplifier for 50 and 144 Mc." on page 405. It runs push-pull class-C, up to 120 Watts CW or FM, and 100 Watts AM. And the following fellow has gone to an awful lot of trouble to use two 829Bs in parallel single-ended triode mode in a stereo amplifier: http://www.pmillett.addr.com/829b_amplifier.htm |
In article fmCUb.12231$gl2.8324@lakeread05, " Uncle Peter"
writes: "Dave" wrote in message tnews.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. They are WWII military tubes. As you surmised, mostly for VHF work. The smaller cousin was the 832B tube, used in the SCR-522 transmitter (driver, PA stages). A very popular conversion for 2-meter AM through the 50s and early 60s. The modern version of the 829 is the 5894 power tube. The 829 was the final amplifier in the AN/TRC-1 and AN/TRC-4 VHF radio relay transmitter that was first fielded in Europe in 1943. 70 to 90 MHz, crystal controlled, phase modulation at a low frequency, multiplied many times. Probably designed about 1941 but no data on that. Dual pentode with common cathode, plates brought out to heavy pins on the envelope top. Pushed and operating at maximums, it can put out about 75 W at 6 Meters. TRC-1 and TRC-8 (high VHF) radio relay equipment was on 24/7 "hot spares" service for landline coupling backup at Army station ADA in Tokyo up to 1954. Had literal hands-on with those. :-) Those TRC-1 transmitters ran for hours and hours and hours without fail, 40 to 50 Watts RF output. A small tale on Lubriplate from Hank Kolesnik's mention in another thread: The old radio relay equipment had separate receiver and and transmitter cases and the TRC-1s had brushless shaded-pole fan motors in the lids. While very cheap, those shaded-pole motors are quite reliable. They have a (felt?) lubricant pad for sleeve bearings; no appreciable load to require ball bearings nor high speed. A well-intentioned newbie on one shift decided to "improve motor performance" with Lubriplate (then a very new product in 1954) and loaded the lubricant pads with it. While Lubriplate is a very good product, it is a SLOW-SPEED thing. The shaded-pole fan motors would seize up eventually, their normal light oil lubricant displaced by the Lubriplate. For about three months it was SOP for all shifts to have the "VHF man" check all the fans. Any fan with low or no flow meant a bothersome job of removing the fan, replacing it with a spare, then soaking the lubricant pad for several hours in solvent, saturating it afterwards in the proper light oil, checking it out, keeping it as a spare for the next stopped fan. Really put a kink in my magazine reading on the night shifts...:-) Lubriplate is a fine lubricant for dial drives and shaft bearings but should NOT be used in motor bearings. Other than one incident with a blown fuse in one transmitter, the dozen-plus AN/TRC-1s and TRC-8s ran and ran and ran reliably. Len Anderson retired (from regular hours) electronic engineer person |
In article fmCUb.12231$gl2.8324@lakeread05, " Uncle Peter"
writes: "Dave" wrote in message tnews.com... Hi all, I just found several 829B tubes - believe it or not in my garage - I must have got them in a box of stuff at a ham fest at one time. A check on Ebay shows they're pretty much worthless for the sake of dollars, but they're so COOL! With the two plate caps that are actually just stiff pins, they look like little Martians. They are WWII military tubes. As you surmised, mostly for VHF work. The smaller cousin was the 832B tube, used in the SCR-522 transmitter (driver, PA stages). A very popular conversion for 2-meter AM through the 50s and early 60s. The modern version of the 829 is the 5894 power tube. The 829 was the final amplifier in the AN/TRC-1 and AN/TRC-4 VHF radio relay transmitter that was first fielded in Europe in 1943. 70 to 90 MHz, crystal controlled, phase modulation at a low frequency, multiplied many times. Probably designed about 1941 but no data on that. Dual pentode with common cathode, plates brought out to heavy pins on the envelope top. Pushed and operating at maximums, it can put out about 75 W at 6 Meters. TRC-1 and TRC-8 (high VHF) radio relay equipment was on 24/7 "hot spares" service for landline coupling backup at Army station ADA in Tokyo up to 1954. Had literal hands-on with those. :-) Those TRC-1 transmitters ran for hours and hours and hours without fail, 40 to 50 Watts RF output. A small tale on Lubriplate from Hank Kolesnik's mention in another thread: The old radio relay equipment had separate receiver and and transmitter cases and the TRC-1s had brushless shaded-pole fan motors in the lids. While very cheap, those shaded-pole motors are quite reliable. They have a (felt?) lubricant pad for sleeve bearings; no appreciable load to require ball bearings nor high speed. A well-intentioned newbie on one shift decided to "improve motor performance" with Lubriplate (then a very new product in 1954) and loaded the lubricant pads with it. While Lubriplate is a very good product, it is a SLOW-SPEED thing. The shaded-pole fan motors would seize up eventually, their normal light oil lubricant displaced by the Lubriplate. For about three months it was SOP for all shifts to have the "VHF man" check all the fans. Any fan with low or no flow meant a bothersome job of removing the fan, replacing it with a spare, then soaking the lubricant pad for several hours in solvent, saturating it afterwards in the proper light oil, checking it out, keeping it as a spare for the next stopped fan. Really put a kink in my magazine reading on the night shifts...:-) Lubriplate is a fine lubricant for dial drives and shaft bearings but should NOT be used in motor bearings. Other than one incident with a blown fuse in one transmitter, the dozen-plus AN/TRC-1s and TRC-8s ran and ran and ran reliably. Len Anderson retired (from regular hours) electronic engineer person |
"Dave" wrote in message news.com... Many thanks to all who replied, both here and by email. They sound like a great tube for LOTS of purposes. My favorite suggestion was building a regen, using each half in place of the 6AQ5's called for in the ARRL handbook design from the 50's! How about an oscillator / amplifier for HF, running low plate voltage for a relatively low RF output? Seems they should be able to do that - and having a separate oscillator stage it wouldn't be prone to runaway and exessive crystal current. And it would look VERY cool! I'd think running the 829 in parallel for a HF PA, with another 829 as a P-P modulator would be a neat project. Pete |
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