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Fender Hot Rod Deville switch chatter no bias reading

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  • #16
    You said the amp is working. If there is no bias current, I would expect audible crossover distortion on clean settings.
    What is the DC voltage on the power tube grids?

    Edit: re-reading, you are getting more than 600mV (OL for fluke 117) when checking the bias test point on mV range?
    "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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