Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Gu50 output problems
Gu50 output problems
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 26th December 2009, 12:05 AM   #31
adam2a3 is offline adam2a3  Greece
diyAudio Member
Join Date: Mar 2008
Hello, I have built a QUAD II amp using an original QUAD output transformer and in place of KT66's I used the GU50's. Apart from the different cathode resistor I had to install 47R anode stop resistors and to stabilize by VR tubes the g2 voltage. I added an extra 12V dc filament supply. The tubes are used with aluminum heatsinks (!), taken from a USSR transmitter. The dual socket assy as well.
Also there was a PP KT88 amp published in Glass Audio several years ago, in which output tubes were driven from their cathodes by an opamp chip. In this amp the KT88's could be replaced by GU50's that worked whithout problems and as I remember the output was more than 30 Watts of excellent sound. adam2a3
  Reply With Quote
Old 27th April 2013, 05:53 PM   #32
zdenoeddie is offline zdenoeddie
diyAudio Member
Join Date: Feb 2010
Hi mates!
I renew this thread, I'm going to build PP UL gu50 amplifier. But I'm afraid cause maximum voltge on G2. I have Ub cca 450V. Are anybody tested this tubes (gu50) with Ug2 voltage higher than 300V? Is there any problem, or some faults? Thanks very much!
(Output tran. is 3k/60W/UL taps 43%, with cathode feedback).
  Reply With Quote


Gu50 output problemsHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gu50 cristelu2006 Tubes / Valves 13 18th November 2009 10:29 PM
IR2110 output problems G4ME Class D 7 15th January 2008 04:25 PM
41hz Amp 4 Output Problems emu Class D 1 20th December 2007 09:04 PM
Gu50 Set ? pwan Tubes / Valves 3 22nd April 2007 04:15 PM
Audio schematics for GU50 ???? felixx Tubes / Valves 16 8th February 2007 05:19 AM

New To Site? Need Help?

All times are GMT. The time now is 06:03 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio