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Old 21st April 2005, 04:21 PM   #1
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Default Someone help: SE shematic with GK71?

Hello, i have some of these GK71 Russian tubes and i want make SE amp with two (i think) of them..
Someone please help with shematic for these tubes?
Thank You in advice
Best Reggards!
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Old 23rd April 2005, 09:18 PM   #2
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Default eh

Hello Tube Manicas, is there anyone who may help me with ideas about GK71 in some sheme for amplifier?!
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Old 24th April 2005, 05:02 AM   #3
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This is the same tube as a GM70. here are 2 links.
http://diyparadise.com/nikcgm70.html
http://www.republika.pl/diytriode/drugi_eng.htm
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Old 24th April 2005, 09:28 AM   #4
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Default :)

Thank You for Your reply...
In the beginning when I wanted to make some SE "monster" I go gor GM70 choice, but there is so difficult getting two of GM70, and then i go to second choice - GK71, that's because i already have these tubes. But I don't think that GK71 is analog to GM70... even in triode use...
The polish link I know from before, but the other is new to me, but thank You for the links ...
...
The question is remain the same- the sheme with GK71 in SE
maybe with 6c33c or gu50 - driver... I don't know yet...
any suggestions are necessary and welcome!
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Old 24th April 2005, 10:20 AM   #5
noyan is offline noyan  Turkey
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Default GK-71

May be you can use ECL86 to drive GK71. Here is the shematic.
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Old 26th April 2005, 04:41 AM   #6
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Default :)

hm, i don't want ecl... but Thank You
I think about something like: GK71 in triode - mode, plus Triode for driver, i thing about double triode 6SN7 ot probably Russian analog 6H8C. Without transformer between two lamps, but only output transformer. Power about 800-900V... Something like this
Best Reggards!
Niki / Bulgaria
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Old 26th April 2005, 10:27 AM   #7
noyan is offline noyan  Turkey
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Default Driver

6N7C is more powerful tube and may be better than 6N8C.
Good luck!
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Old 26th April 2005, 10:37 AM   #8
noyan is offline noyan  Turkey
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Default 6H7C + Gm-70

I bought 17 ea. GM-70 tubes for my projects in Russia and planning to make se amp using 6H7C triode tube as driver. I was talked by Russian old guys that, this driver tube will give me good result with GM-70. I want to use 800-900v DC. I will use silicone diode rectifiers. Do you have any shematic for this?
Regards
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Old 26th April 2005, 09:20 PM   #9
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Default hm... i have to think about this...

I think that 6n8s is better than 6n7s in this case because i may use only one tube for two gk71... and i've heard from some diyers that 6n8s is more musical tube than 6n7s
...
In the other case look at attachment for interesting sheme with GM70 from A.Manakova - one of the best RU diyers
...
Best Reggards

p.s. and what about output transformers?
i've heard for something Turkish firm that make this kind of transformers?
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Old 27th April 2005, 07:10 PM   #10
Radames is offline Radames  United States
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Default How much gain do you want?

I wasn't able to find the datasheet of the GK71. But anyhow, if is similar to the GM70, you could probably use the 417A or the 6C45PE as a single driver tube.

That way, you could keep a two stage topology and as both driver tubes will give a relatively low output impedance stage, you probably won't need an interstage trans.

Cheers,

Rada
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