New GM70-SET amp from Poland

Wow! Those are beautiful looking amplifiers. Nicely done!

What are the two tall amplifiers in this picture? :
Are they tube powered subwoofers, or just really tall amplifiers?

big tower amplifiers gm70

jtwrace · « **Reply #9 on:** 17 Nov 2011, 04:09 pm »

Quote from: utopia on 17 Nov 2011, 04:08 pm

big tower amplifiers gm70

me likey.

utopia · « **Reply #10 on:** 17 Nov 2011, 04:21 pm »

Quote from: jtwrace on 16 Nov 2011, 12:44 pm

Do you make them or are you a customer that's selling his/her pair?

I have built I

jtwrace · « **Reply #11 on:** 17 Nov 2011, 04:23 pm »

Quote from: utopia on 17 Nov 2011, 04:21 pm

I have built I

I don't understand.

utopia · « **Reply #12 on:** 17 Nov 2011, 04:25 pm »

http://www.audiostereo.pl/wzmacniacz-na-gm70_40454.html

jtwrace · « **Reply #13 on:** 17 Nov 2011, 04:36 pm »

Quote from: utopia on 17 Nov 2011, 04:25 pm

sorry but my English is not too good:)

I myself have built amplifiers DIY

http://www.audiostereo.pl/wzmacniacz-na-gm70_40454.html

FullRangeMan · « **Reply #14 on:** 17 Nov 2011, 05:03 pm »

I too fell the amp looks cool.

I not know this circuit, as it use two tubes for supply rectification and three tubes for input.
Would be nice to know more about it, if possible.
Thanks

utopia · « **Reply #15 on:** 17 Nov 2011, 05:05 pm »

FullRangeMan · « **Reply #16 on:** 17 Nov 2011, 05:40 pm »

OK, thanks, I appreciated your effort. But I can not read schematics.
All I can see is the output B+=1200V and primary=7Kohms.
Thanks anyway, it is my fault.

utopia · « **Reply #17 on:** 17 Nov 2011, 05:49 pm »

output transformers

k, normal c-core, without silver...
primary impedance 7kOhm
secondary impedance 6 Ohm
Power output 50W

amplifier is 35 watts
6sn7>6h30p (buffer reduces the inductance)>300b>gm70

FullRangeMan · « **Reply #18 on:** 17 Nov 2011, 10:02 pm »

Thanks Utopia for more info.
As a curious info I mention below, some other GM70 input stage tubes:
De Havilland: 12SN7 + 300B + GM70 old model
De Havilland: 12SN7 + 6AU5 + GM70 new model
SAC-Thailand: 6SL7 + 2A3 + GM70 SET from a custom order
SAC-Thailand: 6N1P + 6BL7 + interstage to two GM70 PP=70W
300B is a great drive tube, being a triode, DHT and plenty of power to drive the GM70.

utopia · « **Reply #19 on:** 17 Nov 2011, 10:05 pm »

Quote from: FULLRANGEMAN on 17 Nov 2011, 10:02 pm

Thanks Utopia for more info.
As a curious info I mention below, some other GM70 input stage tubes:
De Havilland: 12SN7 + 300B + GM70 old model
De Havilland: 12SN7 + 6AU5 + GM70 new model
SAC-Thailand: 6SL7 + 2A3 + GM70 SET from a custom order
SAC-Thailand: 6N1P + 6BL7 + interstage to two GM70 PP=70W

SAC-Thailand: 6SL7 + 2A3 _ GM70 SET from a custom order
SAC-Thailand: 6N1P + 6BL7 + interstage to two GM70 PP=70W

This does not play, I do not recommend heard these amplifiers