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 Post subject: Vacuum Tube Question
PostPosted: May Sat 04, 2019 10:17 pm 
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I have these tubes that just have numbers on them like 6080 and 807 etc. Where can I find what they replaced so I know if I need them or not.


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 Post subject: Re: Vacuum Tube Question
PostPosted: May Sat 04, 2019 10:34 pm 
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Those seem to be transmitting tubes. Sell them to hams if you don't want them. They are not really used in anything but vintage ham transmitters, maybe vintage military or commercial transmitters too. A few amp designs have utilized the 807 tubes in the audio output stages as they are about equal to a 6L6 or so. Except for having the additional nuisance of having plate caps connections. Specs for all those types are readily available online.


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 Post subject: Re: Vacuum Tube Question
PostPosted: May Sun 05, 2019 1:10 am 
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The 6080 is a low-mu double triode, typically used as a series regulator tube in a regulated power supply. They can be utilized as a small P-P triode amplifier, but tend to be unstable under fixed bias, but get very hot under the chassis with the safer cathode bias! There are a few 6080 amplifier designs out there.
807s make good audio amplifiers... use 6L6 component and voltage circuit values on the 807 base... the top cap is the plate, of course... need well insulated cap!
Cheers,
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 Post subject: Re: Vacuum Tube Question
PostPosted: May Sun 05, 2019 2:14 am 
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The first 1625 is an 807 with a different heater voltage, I think. And I see what appears to be 6146 tubes and maybe a fat 811? Still would consider all those transmitter tubes. I think the 1625 is what was used in the WW2 aircraft transmitters. But they could be used in the same circuits as the 807. They are worth something working. Not worth much if duds. For some of those tubes the only way that someone has to test them is in an actual transmitter. But alot of tube testers can handle the 6146 tubes. Basic screening is whether or not the filaments are open and if there is visible damage such as air leaks causing the getter film to turn white, or broken pins etc. Then someone might want them to try versus duds which are displays or landfill. Or BB gun targets. The metal based tubes that look like 6146 tubes might be something else. There were versions made for fast heating/emission in mobile applications that had a different number. Make a list of the numbers on the tubes and we can offer some advice.


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 Post subject: Re: Vacuum Tube Question
PostPosted: May Sun 05, 2019 4:18 am 
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In some old magazine I remember seeing plans for a 75 watt audio amplifier using a pair of 6146s. Just because those are "transmitting" tubes doesn't mean that that is the only thing they can be used for. I have a power supply using a pair of 807s as the pass tubes.

The 6080 is electrically equivalent to a 6AS7 but a lot smaller physically. Note that this is 6AS7, not 6SA7.

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Sun 05, 2019 11:35 am 
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wazz wrote:
The first 1625 is an 807 with a different heater voltage, I think.


Yes and a 7 pin base. The 807 has a 5 pin base. I suppose this was to avoid mistaking one for another in the field.

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Sun 05, 2019 12:35 pm 
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I have a bushel basket full of 807 tubes. I'm waiting until the world runs out of 6L6 tubes, after which they should be worth $422 each to the "audiophiles".

They are also as noted a popular pass tube in older lab power supplies.... my 407D high voltage supply uses 6 of them if memory serves.

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Sun 05, 2019 2:46 pm 
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Any of these worth a lot of money before I sale them all and the other tubes.


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 Post subject: Re: Vacuum Tube Question
PostPosted: May Sun 05, 2019 3:06 pm 
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I don't see anything of high value. Maybe some would have value if they were checked good, but transmitter tubes are best tested in the transmitter they would be used in.

I like those little doorknob shaped tubes. (WE-717A VT-269) They were the WWII precursor to the miniature 6AK5 VHF pentode.

-Steve

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Sun 05, 2019 3:31 pm 
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If you want to see what tubes like this are "worth" ..... check the numbers on Ebay for SOLD items. Just look up the numbers there.

You can do the same on some of the tube seller's websites, but keep in mind that resalers that do this for a living, DO test them and post the test results for high value tubes.

A tube is only worth something if someone will buy it... otherwise they are only good to look at. ;-)

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Mon 06, 2019 1:12 pm 
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Hey Steve

If you want to drive down here and pick them up you can have them for free.

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Mon 06, 2019 6:23 pm 
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There's a bunch of 832 tubes there. They make a nice pentode push-pull audio amp (I know because I built one). They're worth about $7-10 each.


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 Post subject: Re: Vacuum Tube Question
PostPosted: May Mon 06, 2019 6:25 pm 
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... the 829 do a nice parallel single ended audio amp too. They will sell if posted on diyaudio.com's forums.


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 Post subject: Re: Vacuum Tube Question
PostPosted: May Tue 07, 2019 6:30 am 
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The long one is a vidicon tube. They aren't worth much but they are interesting to look at.

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Tue 07, 2019 12:24 pm 
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Metal and glass always looks nice together. Like Brass/Chrome and Wood.

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Tue 07, 2019 2:43 pm 
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Or Brass, Bakelite and Wood :D

-Steve

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Tue 07, 2019 7:23 pm 
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I thought those 832 and 829 were tetrodes. Dual tetrodes. Were used in military transmitters and old ham projects, mainly as VHF amplifiers. They are easily overshadowed by transistor amplifiers that equal or exceed their abilities. I have a couple of each and sockets and frankly find them useless except they look neat. As for the little octal doorknob tubes, those were used as IF amps in WW2 radar or something. Some Asians devised a hi fi preamp that used them for some reason. I have several and they are like the others, cool but useless to most people. You could build something with them just to be different but they are not in demand. The bottles in the first picture would actually be worth more if any good.


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 Post subject: Re: Vacuum Tube Question
PostPosted: May Tue 07, 2019 7:38 pm 
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Bob Dobush at http://www.findatube.com shows the 807 for sale @ $15 new and $7 used.
The 6080 is shown as $9 new $4 used.

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 Post subject: Re: Vacuum Tube Question
PostPosted: May Wed 08, 2019 12:42 am 
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But I assume that is used and tested, not used, as-found.


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 Post subject: Re: Vacuum Tube Question
PostPosted: May Wed 08, 2019 1:33 am 
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wazz wrote:
But I assume that is used and tested, not used, as-found.

yeah, I guess... so.... I would expect so....

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