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Old 4th July 2009, 01:41 PM   #21
kegger is offline kegger  United States
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Join Date: May 2004
Location: michigan
The main issue I personally would have with your suggestion an giving the amp back to
the customer is the removing of the 10ohm cathode resistor and biasing the amp with a
scope, at that point the customer has no clue how to check his amp, replace tubes, ect.

Cathode bias and triode are things known and understood, even for the guy just listening.

(I do appreciate the suggestions though, thanks)

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Old 22nd April 2015, 10:50 AM   #22
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Join Date: Nov 2002
Anyone have a schematic of the ST-85 power amplifier that they would share?
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Old 22nd April 2015, 07:37 PM   #23
ColinF is offline ColinF  New Zealand
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Join Date: Jul 2009
This link isn't of the st-85 but the st-75 would be very similar, but it uses kt90s instead of el34s.
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Old 22nd April 2015, 07:57 PM   #24
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Join Date: Jul 2003
Location: Ann Arbor, MI
That is lunacy; 550V on U-L rigged audio tubes? I have no issue doing this( actually 600V ) to 813 and 4E27, but they are not in the same class as these KT90...LOL
the Tnuctipun will return
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