Old metal tubes

Hojvaelde · 6th May 2009, 07:28 PM

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

bigwill · 6th May 2009, 07:58 PM

"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!

Colt45 · 6th May 2009, 08:19 PM

As long as it isn't a 1B3GT, it's probably useful.

IDSKoT · 7th May 2009, 02:37 AM

Quote:

Originally posted by Colt45
As long as it isn't a 1B3GT, it's probably useful.

What's wrong with the 1B3GT?

DigitalJunkie · 7th May 2009, 03:01 AM

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.

Enzo · 7th May 2009, 03:16 AM

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.

IDSKoT · 7th May 2009, 04:13 AM

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.

Hojvaelde · 7th May 2009, 06:24 AM

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

costis_n · 7th May 2009, 06:50 AM

"1B3GT" is a G lass T ube....

m6tt · 7th May 2009, 07:15 AM

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.

6th May 2009, 07:28 PM	#1
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	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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6th May 2009, 07:58 PM	#2
bigwill General Nuisance diyAudio Member Join Date: Dec 2004 Location: UK	"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!

6th May 2009, 08:19 PM	#3
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	As long as it isn't a 1B3GT, it's probably useful.

7th May 2009, 03:16 AM	#6
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	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.

7th May 2009, 06:24 AM	#8
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	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

7th May 2009, 06:50 AM	#9
costis_n diyAudio Member Join Date: Aug 2008	"1B3GT" is a G lass T ube....

7th May 2009, 07:15 AM	#10
m6tt diyAudio Member Join Date: Aug 2007	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.