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Tue, 03/25/2014 - 09:27
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Yet another bias Q: HD-130 (SS preamp)

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Mark P.
Posted on Friday, August 26, 2005 - 05:27 am:   
I've read every thread on biasing an HD-130, and I'm still confused(!)

Quick question: When biasing a four tube HD-130 (all SS preamp, no splitter tube), shouldn't the voltage drop across the 3.9 ohm resistors be twice as much as for the HD-65 model? In other words, should we be aiming for a ballpark figure of 50mV on the HD-130, compared to 25mV for the HD-65?

-Mark
Mark P.
Posted on Wednesday, September 14, 2005 - 09:09 pm:   
anyone who can clear this up for me?

-Mark
Mike (mike_h)
Username: mike_h

Registered: 06-2006
Posted on Wednesday, May 16, 2007 - 07:00 pm:   
yea, I'm working on my brother's 130 and the same thought occurred to me. until now, I've only worked on mine with two tubes. mmm....
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