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Crate Blue Voodoo BV300HB
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Crate Blue Voodoo BV300HB

Tube Guitar Amp Head from Crate

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Thread BV300HB Bias

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1 BV300HB Bias
Help!
I have a BV300HB and the schematic and some know how...I went to set the bias on a new set of 6550's. The specs say set to -120mV to ground on tp #1.
It's a negative bias setup so reducing the voltage to say -110mV would make it run hotter...I had the new tubes in it for a couple of months with no problems but i thought hey...maybe I can make it sound better by heating it up a bit. So I broke out the DVM and went to set the bias and it reads -88mV! should have exploded way back. The tubes do not glow/get hot after several hours on. Why would it be out of range like this? Any ideas or things to try?
tom
2
Do you happen to have the bias setting for tp 2 as well?