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 Post subject: audio tube list
PostPosted: May Sun 26, 2019 3:08 pm 
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i have searched and didn't find a audio tube list, i have found a few boxes of tubes at a auction house not far from me , i don't want to get tv tubes that i will never use , looked like most are in the 6 series for numbers
there are some 12 series and i know those are audio tubes .
does anyone know of such a list that would cover all audio tube lists
Cheers Don


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 Post subject: Re: audio tube list
PostPosted: May Sun 26, 2019 4:24 pm 
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The most commonly used audio tubes would be: 12AX7/7025/ECC83, 6L6/5881/7581, 6CA4/EL34, 6550/KT88, 6BQ5/EL84/7189, 6V6, 12AU7/ECC82, 12AT7/ECC81.

Some others: 7199, 12DW7/7247, 6DJ8/ECC88/6922, 6267/EF86, 6EU7, 7591, 7868, 2A3, and more.

You can get an idea of the demand by looking at a list of what a tube seller will BUY: http://www.audiotubes.com/bidlist.htm

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 Post subject: Re: audio tube list
PostPosted: May Sun 26, 2019 6:24 pm 
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Thanks Tom
i know of these audio tubes , as i have a few older radios also i just figured i should see if i can find a audio tube list that covers all tubes in radios too
Cheers Don


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 Post subject: Re: audio tube list
PostPosted: May Sun 26, 2019 10:03 pm 
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One of our members made this radio tube list about 15 years ago - I had to use the "Wayback Machine" to find it... front side is list of tubes, back is "sets" of tubes used in various years...


Attachments:
Radio_tubes.pdf [273.36 KiB]
Downloaded 41 times

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 Post subject: Re: audio tube list
PostPosted: May Sun 26, 2019 11:06 pm 
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Ancient folk wisdom: "If you open a can of worms, it takes a larger can to get them back in"

Things that are typically sold as "audio" tubes have characteristics in common with tubes made for more difficult applications. One example is a simple triode. Something that is good for audio frequencies might not work well at 100MHz. But, the 100MHz tube would probably be perfectly fine for audio. And tubes intended for TV sweep circuits can make good audio power stages.

It would be interesting to see what could be built using nothing but the "1$ specials" at ESRC.

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 Post subject: Re: audio tube list
PostPosted: May Mon 27, 2019 2:13 am 
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pixellany wrote:
Ancient folk wisdom:
It would be interesting to see what could be built using nothing but the "1$ specials" at ESRC.

Absolutely Mark...

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 Post subject: Re: audio tube list
PostPosted: May Mon 27, 2019 3:49 am 
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Weren't some of the early horizontal sweep tubes variants of the 6L6 design? I know the 807 was intended for transmitter use, but was primarily a 6L6 with the plate brought out through the top cap and included a Micanol base for lower RF losses.
John

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 Post subject: Re: audio tube list
PostPosted: May Mon 27, 2019 4:26 am 
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OldWireBender wrote:
Weren't some of the early horizontal sweep tubes variants of the 6L6 design? I know the 807 was intended for transmitter use, but was primarily a 6L6 with the plate brought out through the top cap and included a Micanol base for lower RF losses.
John
The 6BG6(A) TV sweep tube is electrically equivalent to the 6L6.

Another, but not 'identical to', tube is the 6HB6. It was intended as a vertical deflection amp for TV sets but it is, in essence, a 'high gain' 6BQ5 with a gm of 20000. John and I used that in his Prince John amplifier. The nice thing about that one, besides the gain, is it's relatively unknown and were 1 buck each.

The 'same thing as" 6BQ5 tube (but with a different pinout) is the 6GK6. I used those as a 6BQ5 replacement back when they were cheaper than the 6BQ5.

Of course, if you're building your own custom amp you're not constrained to using 'conventional' heaters so that opens up things like the 5V6, 10BQ5, 10GK6 (what I actually used) and the 16GK6 (as just a few examples).


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 Post subject: Re: audio tube list
PostPosted: May Tue 28, 2019 1:45 pm 
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nice helpful list Tom.
these posts are very interesting reads .
Cheers


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 Post subject: Re: audio tube list
PostPosted: May Tue 28, 2019 8:31 pm 
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Perhaps a better list would be TV-specific tubes to avoid...... :wink:

Some TV types could be pressed into audio service quite easily, and others have certainly proved this. The key is to know not to pay any premium prices for the TV stuff, hence a "different" list....

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 Post subject: Re: audio tube list
PostPosted: May Thu 30, 2019 12:26 am 
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[quoteI know the 807 was intended for transmitter use, but was primarily a 6L6 with the plate brought out through the top cap and included a Micanol base for lower RF losses. John[/quote]

.....which is why I am hanging on to literally a bushel basket full of 807 tubes :-D .... one of these days, when the 6L6 costs $500, I can make a real killing with these muahahahahaha. In the meantime, my bench Fluke HV power supply uses 6 of the 807s, so a few spares are also nice.

not really ... but what else can I do but hope. ;-)

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 Post subject: Re: audio tube list
PostPosted: May Thu 30, 2019 4:42 pm 
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The 6L6 audiophiles go nuts over is the 6L6GC due to its higher plate dissipation and better power handling.

Over the regular 6L6s, the 807 has a higher plate voltage rating which does help a little. However, the screen cannot handle anywhere near as much voltage, so in the popular "Williamson" circuit the plate voltage can't be any higher than the screen can handle.

The 6L6G and GB are popular because of their looks, which the 807 shares, but try to sell a straight black metal 6L6. You can hardly give them away.

-Steve

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 Post subject: Re: audio tube list
PostPosted: May Thu 30, 2019 9:51 pm 
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That is surprising, because they were original equipment in many RCA amplifiers; some of them specified the 1622, which was just a selected 6L6. Like the metal 6F6, they run hot as fire when in operation.

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 Post subject: Re: audio tube list
PostPosted: May Fri 31, 2019 2:31 am 
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Back on the $1 specials---I bought a handful of these several years ago:
http://www.nj7p.org/Tubes/SQL/Tube_quer ... ype=6AD10A

One section is "beam pentode"--AKA audio output tube--good for about 4-5 watts.

The the other section is a "dual control" pentode intended for FM use. I'll bet 3 cookies it will make an OK 1st audio stage.

So, one tube gives us a general-purpose audio amplifier......

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 Post subject: Re: audio tube list
PostPosted: May Fri 31, 2019 12:18 pm 
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Mark, I am curious how that turns out on the 6AD10.
The FM pentode is intended to be used as a quadrature or "Locked-in Oscillator" FM detector.

The 6J10 or 6Z10 is very similar in that it has a FM detector with an audio output stage.
However, it uses the same special FM detector as the 6BN6 gated beam discriminator which is very unique in construction.
It was developed by Dr. Robert Adler a Zenith engineer and inventor who also developed the Zenith Space Command TV remote control.

I would be surprised if the 6J10/6Z10 could be made to be a two stage audio amplifier, but I'm not ruling it out.

-Steve


Attachments:
6BN6_applic_and_symbol.png
6BN6_applic_and_symbol.png [ 74.67 KiB | Viewed 220 times ]

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 Post subject: Re: audio tube list
PostPosted: May Fri 31, 2019 12:47 pm 
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This data sheet gives "typical" operation of the Pentode section as a class-A amplifier:
https://frank.pocnet.net/sheets/191/6/6AB4.pdf

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"Measure voltage, but THINK current." --anon.


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 Post subject: Re: audio tube list
PostPosted: May Fri 31, 2019 2:02 pm 
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Pete Millett used the similar 6T10 in a small audio amp - he found lowest distortion with grid 3 biased a few volts positive: http://www.pmillett.com/midget.htm

I've seen a commercial amp using the 6AD10, but the 6T10 is still on the dollar menu,

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