say,
Anyone know how to adjust the bias on a Musicman 65? Looks like they control it through 2 transistors in the cathodes of the 6l6's.
At idle, the centertap of the OT measures increadibly low like 4ma, however the amp behaves rather normally.
I'm thinking this arrangement somehow tracks the bias through it's power range, so you don't need to cook the tubes at lower power levels...not sure.
I see it is basically set up as cathode bias with a lower positive voltage on the grids than the cathode equating to about -40vdc between g-1 & K.
That sounds about right, but I don't quite know where (how) they want you to adjust this 'tracking' circuit', if that is indeed what it is.
thanx, g
Anyone know how to adjust the bias on a Musicman 65? Looks like they control it through 2 transistors in the cathodes of the 6l6's.
At idle, the centertap of the OT measures increadibly low like 4ma, however the amp behaves rather normally.
I'm thinking this arrangement somehow tracks the bias through it's power range, so you don't need to cook the tubes at lower power levels...not sure.
I see it is basically set up as cathode bias with a lower positive voltage on the grids than the cathode equating to about -40vdc between g-1 & K.
That sounds about right, but I don't quite know where (how) they want you to adjust this 'tracking' circuit', if that is indeed what it is.
thanx, g
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