SE-EL34 Design Help

[pgambon]

I haven't been here for awhile. Things have changed! I've kind of taken an amp building break. But now I've got the urge to melt some solder!
My next projext will be a SE-EL34 amp on a Tweed Deluxe chassis. It will have two channels; one voiced for single coils and one for buckers, single tone control. I plan to have the first stage followed by two more using the second AX7. This will feed an EL-34 and a Heyboer 18wt OT. The design concept is to get a pure EL-34 tone by hitting the tube pretty hard. So, I'm thinking a pretty robust power supply ,5AR4 with a 50/50uf filter cap.
Here's my question: I'd like to go with a adjustable bias. I find the cathode bias to be a little primitive sounding (i.e. tweed tone). Virtually all SE amps seem to be cathode biased. So, there aren't many (any) schematics with an adjustable bias. I'm thinking that design wise I could just use a typical Fender/Marshall type bias and adapt it to the SE amp. Does anyone have any experience with this kind of amp design to share?
Thanks

[Enzo]

Bias is bias, just make sure things don't leave class A. Unless that is an effect you desire.

[DirtyGeorge]

You are on the right track with the bias. Just copy a Marshall circuit but you will probably need a lower (less negative) bias voltage.

As for OT if the 18W you referred to is a push-pull unit I would not use it. The idle current will be too much. You need an OT designed for SE use. I used a Hammond 125FSE for an EL34 SE build.

Aim for 300v on the plate and idle about 85mA and you will be good.

DG