setting bias voltage

a DIY, modified Mullard 5-20 monoblock design

setting bias voltage

Postby audioray » Thu Oct 14, 2004 11:03 am

no voltage at tp1 & tp2.
do tubes have to be plug in to measure this voltage.
i cannot get -50 volts.
audioray
 
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Re: setting bias voltage

Postby Shannon Parks » Thu Oct 14, 2004 1:04 pm

audioray wrote:no voltage at tp1 & tp2.
do tubes have to be plug in to measure this voltage.
i cannot get -50 volts.


Hi AudioRay,

Yes, you can leave the tubes out for now. Check pin 5 of each EL34 socket. Adjust R15 and R16 to get this adjusted to -50V before you put your tubes in.

Shannon
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