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Old 24th July 2002, 11:45 AM   #1
Higo is offline Higo  Argentina
diyAudio Member
Join Date: Feb 2002
Location: Argentina
Question Tomb Raider

Hello guys. Iīm working in a telecommunications company.
Yesterday, I was in a store place and I found a couple
of tubes. I decided to take a pair, īcause they are
reeplacements of equipment that It was out of service a
couple of years ago...well...more than 10...I felt like Lara Croft...
Here a list of the tubes:
National: 5Y3GT, 6360A, 6CK6/EL83
Sylvania: 6F6GT, 6AK5/EF95
Phillips: EF91

A good mix, not??
Well, I was searching in the Web, īcause I donīt have
any experience with tubes and I found only three are
used in audio applications:
5Y3GT,12AT7 and 6F6GT...Is it rigth???
5Y3GT is a rectifier
12AT7 is used in preamps
6F6GT is used in amps.
The others:
EF91 (RF applications), 6CK6 (Video), 6AK5 (HF amp),
6360A (???)

I want to make a good preamp and, if Itīs possible, a
decent amplifier (I mean 30W... more or less)

Question: I was reading that is possible to use 12AT7 in
"replacement" of 12AX??? When I said replacement I mean
that is suitable for similar application... What are your
Question: Any idea of schematics of some of the tubes???
Something about 6F6GT??? I think that the "others"
are a litle more common...

Any comments and advices will be appreciate.
Thank you very much.
from Buenos Aires - Argentina
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Old 25th July 2002, 12:31 AM   #2
diyAudio Member
Tom Bavis's Avatar
Join Date: Jun 2002
Location: Macedon NY
6F6 is a power pentode - a pair can deliver 15 watts or more. If there are four, it would be a start at a stereo amp. If there are two, a single ended stereo amp is a possibility - but only about four watts per channel. I have a little amp like this on my computer (12AX7 and 6AQ5s). If you want to build something, I can give some pointers.

12AT7 is lower gain, higher power than 12AX7 - makes a good driver tube as well as preamp. 6360 is a odd one - dual pentode for RF amp at 200 MHz - but it is specified for audio too - see
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Old 25th July 2002, 12:41 PM   #3
Higo is offline Higo  Argentina
diyAudio Member
Join Date: Feb 2002
Location: Argentina
Thank you for your answer Tom.
In these days, Iīll start a design, in spite of Iīm not specialized in tubes. Yesterday I was reading a lot and I think that Itīs not so complicated. At leat I hope so...
Greetings and Iīm sorry for my english...
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Old 22nd May 2006, 02:27 AM   #4
diyAudio Member
Join Date: Jul 2004
Location: Bangok

National: 5Y3GT, 6360A, 6CK6/EL83
I found EL83 can make a nice amplifier.

Good luck,
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