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In Reply to: RE: PL Prologue autobias adjustment ...part 2 posted by johns dad on December 28, 2015 at 08:07:18
The 6CA7 quad is new with 50 hours on it. The bias point is 62mA for all of them but I could not get over 340mV or 34mA with any of them. They sound fine though. The "adaptive" bias does not seem very adaptive to me.
Follow Ups:
Sorry I thought that only one tube was exhibiting this problem. Is this a new problem?
I think it's always been that way. I never checked it until I had the urge to try 6550/kt88 tubes and I thought I could set the bias higher basically to the Prologue 5 setting. So yes, the amp can work with a lot of other tube types but I don't see the point of trying them if those tubes are running on the cold side.
What is the stock tube for this unit?
Johns dad, stock tubes are Chinese EL34B rebranded.
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