Hi from Brisbane Australia

nick62 · 23rd May 2010, 01:01 PM

Hello there,
I am new to this forum and have been into valve hi fi gear for about two years now and am eager to learn how to build my own valve gear.
Currently I have two Sound Reference monos each running 4xWinged C KT88's and two 6922's, great clean massive sound running into Sound Reference Pre(tube) with phono stage, Vandersteen 2c's and a Rega Planar3 with RB600 tonearm and Ortofon 2M Bronze stylus.
I love the sound I am getting from those KT's!

I have recently been reading up on the Soviet GU50 copied from the LS50. I am intrigued by these tubes and was wondering if anyone out there has schematics and transformer specs for something single ended? There is little on the net and I would love to build something out of this wonderful bizarre tube.
Thankyou in advance.
Nicko from Brisbane

Prophetmaster · 24th May 2010, 11:06 AM

HI! In Russian Internet are very many information about schematics and transformer specs for GU-50, but in russian language

I have found about transformer: I max = 120 mA, Ra/Rn = 3.5 k\4-8 Om (6.3 optimal), transformation factor 26:1, 20 Hz-25000 kHz
Schematics: http://klimanski.com/wp-content/uplo...10/gu_50_9.gif
Still write that power output is more than 5 W it is not necessary to do - if Your want very good sound.

nick62 · 24th May 2010, 02:23 PM

Thanks for your help Prophetmaster, much appreciated! Do you have any sources of these valves and the sockets (die cast) that hold them in?
Thanks Nicko

Prophetmaster · 25th May 2010, 08:36 AM

It I do not know

. I do not design valve amplifiers, only on semiconductors. Here, for example: Chip Amp Photo Gallery

Cal Weldon · 26th May 2010, 04:43 AM

Hello Nicko and welcome to the forums.

Jonathan Bright · 05:22 AM

Suburb? I'm at Camp Hill.....S/side.......mainly solid state I'm afriad but the redeeming feature is that they do run in class A and I at least have the tubes to build a RIAA pre-amp eventuallllllllllllllllllllllllly!!!!! Ha ha.

Welcom aboard. There was a speaker builders thread for the Brisbane area active a year or two ago. They met several times.

If you want local contact you might modify your personal deatils so the locals know Qld...Great South East etc.....on the otherhand I CAN understand the desire for a quiet life. And today we can all say "Go the Cane Toads!" or words to that effect.
Jonathan

23rd May 2010, 01:01 PM	#1
nick62 diyAudio Member Join Date: May 2010	Hi from Brisbane Australia Hello there, I am new to this forum and have been into valve hi fi gear for about two years now and am eager to learn how to build my own valve gear. Currently I have two Sound Reference monos each running 4xWinged C KT88's and two 6922's, great clean massive sound running into Sound Reference Pre(tube) with phono stage, Vandersteen 2c's and a Rega Planar3 with RB600 tonearm and Ortofon 2M Bronze stylus. I love the sound I am getting from those KT's! I have recently been reading up on the Soviet GU50 copied from the LS50. I am intrigued by these tubes and was wondering if anyone out there has schematics and transformer specs for something single ended? There is little on the net and I would love to build something out of this wonderful bizarre tube. Thankyou in advance. Nicko from Brisbane

24th May 2010, 11:06 AM	#2
Prophetmaster diyAudio Member Join Date: Apr 2010 Location: Russian Federation, Moscow	HI! In Russian Internet are very many information about schematics and transformer specs for GU-50, but in russian language I have found about transformer: I max = 120 mA, Ra/Rn = 3.5 k\4-8 Om (6.3 optimal), transformation factor 26:1, 20 Hz-25000 kHz Schematics: http://klimanski.com/wp-content/uplo...10/gu_50_9.gif Still write that power output is more than 5 W it is not necessary to do - if Your want very good sound. __________________ Adcom GDV-870 (DVD-Audio), Nakamichi ZX-7(Tape), Y-1 from A. Klyachin http://www.klyachin.ru/images/PF.jpg (Speakers), Pioneer PL-1250 (Vinyl), Prophetmaster's RIAA preamp & Power Amplifiers

25th May 2010, 08:36 AM	#4
Prophetmaster diyAudio Member Join Date: Apr 2010 Location: Russian Federation, Moscow	It I do not know. I do not design valve amplifiers, only on semiconductors. Here, for example: Chip Amp Photo Gallery __________________ Adcom GDV-870 (DVD-Audio), Nakamichi ZX-7(Tape), Y-1 from A. Klyachin http://www.klyachin.ru/images/PF.jpg (Speakers), Pioneer PL-1250 (Vinyl), Prophetmaster's RIAA preamp & Power Amplifiers

26th May 2010, 04:43 AM	#5
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Hello Nicko and welcome to the forums. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

26th May 2010, 05:19 AM	#6
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	Suburb? I'm at Camp Hill.....S/side.......mainly solid state I'm afriad but the redeeming feature is that they do run in class A and I at least have the tubes to build a RIAA pre-amp eventuallllllllllllllllllllllllly!!!!! Ha ha. Welcom aboard. There was a speaker builders thread for the Brisbane area active a year or two ago. They met several times. If you want local contact you might modify your personal deatils so the locals know Qld...Great South East etc.....on the otherhand I CAN understand the desire for a quiet life. And today we can all say "Go the Cane Toads!" or words to that effect. Jonathan __________________ "It was the Spring time of the year when aunt calls to aunt like mastodons across the frozen waste." P.G. Wodehouse. Last edited by Jonathan Bright; 26th May 2010 at 05:22 AM.


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24th May 2010, 02:23 PM	#3
nick62 diyAudio Member Join Date: May 2010	Thanks for your help Prophetmaster, much appreciated! Do you have any sources of these valves and the sockets (die cast) that hold them in? Thanks Nicko

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