Fixed Bias Supply Voltage

a DIY, modified Mullard 5-20 monoblock design

Fixed Bias Supply Voltage

Postby HiFiGuy » Mon Nov 09, 2015 6:07 am

In the manual it states that the bias supply should be -50V in the power up test. I would like to change this to -70V, the bias supply caps are 250V rated so this should not be a problem. Are there a couple of parts I could change in the supply to get this higher voltage?

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Re: Fixed Bias Supply Voltage

Postby battradio » Tue Nov 10, 2015 12:14 am

Most likely it will go that high to begin with , if it doesn't change C18 a .1uf cap to .15 uf and you will get the voltage you desire
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