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#11
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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 |
#12
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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. |
#13
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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 |
#14
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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) |
#15
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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." |
#16
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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." |
#17
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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 |
#18
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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 |
#19
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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 |
#20
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"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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