Tomb Raider

Higo · 24th July 2002, 11:45 AM

Hello guys. I´m 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, ´cause 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
RCA:12AT7/ECC81
Sylvania: 6F6GT, 6AK5/EF95
Phillips: EF91

A good mix, not??
Well, I was searching in the Web, ´cause I don´t 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 It´s 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
opinions?
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.
Greetings.
Marcelo
from Buenos Aires - Argentina

Tom Bavis · 25th July 2002, 12:31 AM

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 http://frank.pocnet.net/sheets/133/6/6360.pdf

Higo · 25th July 2002, 12:41 PM

Thank you for your answer Tom.
In these days, I´ll start a design, in spite of I´m not specialized in tubes. Yesterday I was reading a lot and I think that It´s not so complicated. At leat I hope so...
Greetings and I´m sorry for my english...

Marcelo.

papanohn · 22nd May 2006, 02:27 AM

Hello,

Quote:

National: 5Y3GT, 6360A, 6CK6/EL83

I found EL83 can make a nice amplifier.

Good luck,

24th July 2002, 11:45 AM	#1
Higo diyAudio Member Join Date: Feb 2002 Location: Argentina	Tomb Raider Hello guys. I´m 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, ´cause 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 RCA:12AT7/ECC81 Sylvania: 6F6GT, 6AK5/EF95 Phillips: EF91 A good mix, not?? Well, I was searching in the Web, ´cause I don´t 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 It´s 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 opinions? 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. Greetings. Marcelo from Buenos Aires - Argentina

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25th July 2002, 12:31 AM	#2
Tom Bavis diyAudio Member 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 http://frank.pocnet.net/sheets/133/6/6360.pdf

25th July 2002, 12:41 PM	#3
Higo diyAudio Member Join Date: Feb 2002 Location: Argentina	Thank you for your answer Tom. In these days, I´ll start a design, in spite of I´m not specialized in tubes. Yesterday I was reading a lot and I think that It´s not so complicated. At leat I hope so... Greetings and I´m sorry for my english... Marcelo.