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#1
Posted to rec.audio.tubes
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query re garbage console
Found a cheap old console on a curb, nothing special. But I'm having
trouble IDing the output tubes. There are two little 5 watt OTs, 10K primary, 4 ohm secondary. Since I'm just about to move in a few weeks, I don't want to open the thing up just yet to trace the wiring back from the OTs. The two tubes closest to the OTs are a 6BE6 and a 6BA6. Could those be the power amp tubes? I haven't found any other candidates. There is one EL80, but nothing that matches it for the other channel. |
#2
Posted to rec.audio.tubes
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query re garbage console
Bret Ludwig wrote:
thomas wrote: Found a cheap old console on a curb, nothing special. But I'm having trouble IDing the output tubes. There are two little 5 watt OTs, 10K primary, 4 ohm secondary. Since I'm just about to move in a few weeks, I don't want to open the thing up just yet to trace the wiring back from the OTs. The two tubes closest to the OTs are a 6BE6 and a 6BA6. Could those be the power amp tubes? I haven't found any other candidates. There is one EL80, but nothing that matches it for the other channel. As you know from Mr. Tube Manual.....you DO have a Tube Manual!!!!!.....the 6BA6 and 6BE6 are (in no particular order) an RF amp and a pentagrid mixer/oscillator for the tuner. They nearly always go together and were used in most serious radios. Thanks. I am moving. My books are packed and my knowledge of this stuff is rudimentary at best. Given that this is a stereo receiver, with two OTs, I expected to find two matching output tubes, but no such luck. There are two metal boxes on the chassis, each with a tube barely protruding, but I presume those are more radio parts. The only two identical tubes are 12AX7s, which are widely spaced apart on the chassis, and I doubt they would be used as power amp tubes anyway. BTW, I have an old Silvertone guitar amp that uses a little 6BE6 as the preamp tube driving a 6V6. The tone is rather vanilla right now, but I have yet to restore it. |
#3
Posted to rec.audio.tubes
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query re garbage console
thomas wrote:
Found a cheap old console on a curb, nothing special. But I'm having trouble IDing the output tubes. There are two little 5 watt OTs, 10K primary, 4 ohm secondary. Since I'm just about to move in a few weeks, I don't want to open the thing up just yet to trace the wiring back from the OTs. The two tubes closest to the OTs are a 6BE6 and a 6BA6. Could those be the power amp tubes? Those are tubes usually used in radio receiver circuits. Maybe someone stuck them in random sockets. Neither of those tubes would be able to do audio output duty. Something like a 6AQ5 might be the kind of tube for audio amps. That's a 7 pin tube. |
#4
Posted to rec.audio.tubes
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query re garbage console
On 18 Dec 2006 08:50:08 -0800, "thomas" wrote:
Found a cheap old console on a curb, nothing special. But I'm having trouble IDing the output tubes. There are two little 5 watt OTs, 10K primary, 4 ohm secondary. Since I'm just about to move in a few weeks, I don't want to open the thing up just yet to trace the wiring back from the OTs. The two tubes closest to the OTs are a 6BE6 and a 6BA6. Could those be the power amp tubes? I haven't found any other candidates. There is one EL80, but nothing that matches it for the other channel. I once saw a Bradford (W. T. Grant) stereo console that used a single ELL80 for the two output channels. That's a dual power pentode, essentially two EL95s in one bottle. |
#5
Posted to rec.audio.tubes
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query re garbage console
Tom Bavis wrote:
On 18 Dec 2006 08:50:08 -0800, "thomas" wrote: Found a cheap old console on a curb, nothing special. But I'm having trouble IDing the output tubes. There are two little 5 watt OTs, 10K primary, 4 ohm secondary. Since I'm just about to move in a few weeks, I don't want to open the thing up just yet to trace the wiring back from the OTs. The two tubes closest to the OTs are a 6BE6 and a 6BA6. Could those be the power amp tubes? I haven't found any other candidates. There is one EL80, but nothing that matches it for the other channel. I once saw a Bradford (W. T. Grant) stereo console that used a single ELL80 for the two output channels. That's a dual power pentode, essentially two EL95s in one bottle. Thanks, that must be the answer. The tube's ID is too worn off the glass to say for sure, but it does appear to have a symmetrical structure inside, consistent with two equivalent sections, one on each side. I got so curious that I was going to take the chassis apart and trace the wiring back to the OTs, but the darn thing requires a flat head screwdriver to disassemble, which are all packed away in my obsolete toolbox. Tubestore.com wants $50 for a NOS ELL80. Is there really a market for this bottle? I doubt I'll use it for anything. I'll probably strip this receiver all the way back, and use the chassis, the PT, and one of the OTs to make a low-power guitar amp. If anyone wants to trade me for the ELL80 let me know. It was an experience picking this thing off the curb. I am a gentrifier on a nice block of 1920s Craftsman houses that are situated in a working class minority neighborhood (ghetto, slum, whatever). The console's former owner came out to chat me up as I was removing the amp from the console. I think he was bemused to see a middle class white man picking through his garbage. I know him a little bit. Like about 50% of the poor people who live down here, he's got a job, owns his house, takes care of his kids and animals, and is a decent guy. It burns me up when politicians and libertarians demonize the poor. Some of them fit the negative stereotypes, but most don't. |
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