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Old 26th December 2009, 12:05 AM   #31
adam2a3 is offline adam2a3  Greece
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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
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Old 27th April 2013, 05:53 PM   #32
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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).
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