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#1
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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 |
#2
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![]() "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. |
#3
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![]() "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 |
#4
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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 |
#5
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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 |
#6
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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. |
#7
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![]() "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. |
#8
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![]() "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 |
#9
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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. |
#10
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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 |
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