djmiyta
Well-known member
So playing around with my Dr Boogie and Pal800 both utilizing SMD J201’s , the Dr.Boogie sounds fantastic but it seems every 3rd or 4th time I play with it I have to adjust the trimmers slightly to get the certain sound I like. I know that germanium trannys are affected by temp changes but what causes silicone (?) trannys to drift. I thought maybe it was my ears so I did some recordings and I definitely can hear a difference
With the Pal800 using the same J201’s all biased properly I can get NO distortion from it. So with the Pal800 do I need to audition J201’s to get it right and with Dr Boogie what legs of the trimmer get measured for the resistance? Cause if the trannys aren’t drifting then it must somehow be the trimmers shifting. And do you people think trimmers can add to the overall noise of a build meaning if resistors instead of trimmers were used it’d be quieter?
I’ve read and tried to understand about biasing but haven’t really found answers to these questions especially measuring the trimmers for resistors. I know its a simple thing once I know how
Thanks for any help
With the Pal800 using the same J201’s all biased properly I can get NO distortion from it. So with the Pal800 do I need to audition J201’s to get it right and with Dr Boogie what legs of the trimmer get measured for the resistance? Cause if the trannys aren’t drifting then it must somehow be the trimmers shifting. And do you people think trimmers can add to the overall noise of a build meaning if resistors instead of trimmers were used it’d be quieter?
I’ve read and tried to understand about biasing but haven’t really found answers to these questions especially measuring the trimmers for resistors. I know its a simple thing once I know how
Thanks for any help