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#1 2013-03-22 12:22:51

Fefo72
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Registered: 2013-03-22
Posts: 2

V4 Bias supply question

Hello

I'm quite puzzled about the behavior of the bias supply on my V4.
When I switch the amp on I have -567V on power tubes grid, but when I put the stand-by switch on the play position, the bias voltage is correctly set at -36V (I have an adjustable bias).

Looking at the schematic this could sound correct, but my question is: won't the -567V damage the power tubes grid?


http://www.ampegv4.com/images/VT22_Schem2.jpg

Last edited by Fefo72 (2013-03-22 12:24:56)

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#2 2013-06-20 06:50:45

stillbatt
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Registered: 2013-06-20
Posts: 1

Re: V4 Bias supply question

I found that strange but not certain why.  I will say this - from a design perspective, it looks like that stage had a gain of 11, which more or less equals the gain LOST by the baxandall tone stack when set flat.




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Last edited by stillbatt (2016-01-20 07:39:13)


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