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Old 6th May 2009, 07:28 PM   #1
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Location: Denmark
Question Old metal tubes

Hey

I got some (+50 pcs) old octal metal tubes.

I know that some of them not usable for audio use and at this point I would like to hear from specialists. I will then put them furthest away in the basement.

6 and 12SG7 pentode (maybe audio)
12SC7 Dual triode
6AC7 Pentode ( driver audio)

6SA7 Heptode
12SQ7 Triode
6SS7 Pentode

12SK7 Pentode
6K7 Pentode
6SJ7 Pentode (audio)

6SH7 Pentode
6J5 Same as one triode unit of 6SN7GT (AUDIO)
6Q7 Double Diode-Triode

6F5 Triode
6SK7 Pentode
6J7 (Audio)
6K8 Triode-Hexode

Regards

Benny

Denmark
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Old 6th May 2009, 07:58 PM   #2
bigwill is offline bigwill  United Kingdom
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"Not usable for audio" is just someone's opinion really. A lot of those pentodes could be triode strapped and probably be quite linear. Have fun and experiment!
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Old 6th May 2009, 08:19 PM   #3
Colt45 is offline Colt45  Serbia
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As long as it isn't a 1B3GT, it's probably useful.
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Old 7th May 2009, 02:37 AM   #4
IDSKoT is offline IDSKoT  United States
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Quote:
Originally posted by Colt45
As long as it isn't a 1B3GT, it's probably useful.

What's wrong with the 1B3GT?
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Old 7th May 2009, 03:01 AM   #5
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Quote:
Originally posted by IDSKoT



What's wrong with the 1B3GT?

Nothing,if you need a HV low current rectifier.. Not particularly useful in the average audio-related circuit though.
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Old 7th May 2009, 03:16 AM   #6
Enzo is offline Enzo  United States
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However, a 1B3 is a very elegant looking tube in my opinion. The innards are very nice and simple.

As things to look at, the 1B3 is up on my list, along with the cute little metal 6H6, which looks more like a jumper plug than a tube. I have some metal tubes that are finished in bright red that are attractive as well.
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Old 7th May 2009, 04:13 AM   #7
IDSKoT is offline IDSKoT  United States
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Quote:
Originally posted by Enzo
However, a 1B3 is a very elegant looking tube in my opinion. The innards are very nice and simple.

As things to look at, the 1B3 is up on my list, along with the cute little metal 6H6, which looks more like a jumper plug than a tube. I have some metal tubes that are finished in bright red that are attractive as well.

I just Googled it, and I'll have to agree. A very nice looking tube. But I don't think the 6H6 is very aesthetically pleasing. Haha. Glass tubes takes the cake on that one.
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Old 7th May 2009, 06:24 AM   #8
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Hey

I sorted the tubes last night. There are over 100 pieces.

There are only 5 when I can not read type.

I have more than 30 pieces 6/12SG7.

There is also a part 6H6 tubes. Cute little tubes but unusable.

Benny
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Old 7th May 2009, 06:50 AM   #9
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"1B3GT" is a G lass T ube....
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Old 7th May 2009, 07:15 AM   #10
m6tt is offline m6tt  United States
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12sc7 is a high-mu dual triode that was used in the preamps of many hammond organs. Definitely useful for audio. 12SH7 can be used as an audio pentode, but you'll want to bias the heaters. Pretty much *any* tube can be used for audio if you're dedicated and understand the theory behind them. Sure, some have higher noise...use them as phase inverters or drivers. Sure, some have many, many grids....RCA handbooks have many applications for 6L7, which is a septode. Even the remote-cutoff parts can be used for compressors, volume controls and CCSes. Many of the original uses for these metal tubes involved linear amplification, in any case. This was the era of radio and not TV or computers.
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