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Old 12th June 2006, 11:36 AM   #21
beamnet is offline beamnet  Netherlands
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use an 6sn7 or two 6j5's

but i have plenty 7193-like valves for sale..

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Old 20th January 2007, 05:19 PM   #22
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2K for primary impedance isn't to low for Gu50, i know that the tube needs arround 5K.
have you made changes to the schematic after you solved the problems or the schematic is the final...
do you have a schematic for the power supply of the circuit???and for de output transformer

thanks
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Old 20th January 2007, 07:50 PM   #23
Zibi is offline Zibi  Poland
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http://www.tubefreak.de/
http://www.goldenmiddle.com/english/trans.htm
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Old 21st January 2007, 12:53 PM   #24
beamnet is offline beamnet  Netherlands
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There is no former there that would survive the gu-50

Im have used beard p-100 output formers.

The other link doesn' have a schem

I would advidse the schem i gave. It is simple as hell and allows for easy mods. i have ccs on the tail now and various other tweaks.

The ps:
schematic

Good luck!
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Old 21st January 2007, 08:28 PM   #25
Zibi is offline Zibi  Poland
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adishor_2005 wrote: 2K for primary impedance isn't to low for Gu50, i know that the tube needs arround 5K.

http://www.goldenmiddle.com/english/trans.htm :
5k/8ohm 40W Recommended tubes: 6P3S, 6L6, 6S4S/2A3, 300B, 6550, EL34, 6P41S, 6P36S, 6P45S, KT66, KT88, G807, GU50, 6R3S, GU19
6k/8ohm 50W Recommended tubes: RB300-3CX, KT66, KT88, 6550, GU50

http://www.realaudiotechnika.bacska.hu/parts.htm :
PPP Raa 2K5/8ohm 120W PPP GU50 (AB 120W RMS!)
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Old 21st January 2007, 09:17 PM   #26
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Quote:
Originally posted by Zibi


http://www.realaudiotechnika.bacska.hu/parts.htm :
PPP Raa 2K5/8ohm 120W PPP GU50 (AB 120W RMS!)

What is PPP? 2 tubes in parallel?
One pair of GU-50 gives 120W in PP mode with 6K CT transformer.

Actually, it was a LS-50 stolen from WW-II enemy by Soviet engineers. It was designed by Telefunken ray pentode, after the war they used to produce EL152 that was cheaper than military version LS-50 and Soviet clone GU-50, but anyway it was expensive because of materials and technology. Rated for 40W plate dissipation it could survive more because of specially treated nickel plate that could glow red without a harm for a tube.

http://www.tubecollector.org/main/ls50.jpg
http://www.wiwitubes.com/pic/tube/TFKel152.jpg
http://www.tubecollector.org/main/r-gu50.jpg

I was intended too keep silence about it, because ePay reacts fast on publications on forums...

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Old 21st January 2007, 10:22 PM   #27
Zibi is offline Zibi  Poland
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parallel push-pull

120W@6k load O.K. - but what about anode voltage?
800V? 1kV?
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Old 21st January 2007, 10:49 PM   #28
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Quote:
Originally posted by Zibi
parallel push-pull

120W@6k load O.K. - but what about anode voltage?
800V? 1kV?
750 in my amps.
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Old 22nd January 2007, 03:23 PM   #29
Zibi is offline Zibi  Poland
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Pretty high.
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Old 22nd January 2007, 07:15 PM   #30
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Just enough for an excellent sound.
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