EL34 SE ultralinear schematic

[dirkwright]

I just want to know, do you intend to drive the screen grid of the EL34 instead of the control grid (pin 5 instead of pin 1)?

Otherwise, I would suggest trying the ultrapath feedback network in the output stage. You'd need one choke per channel for that.

I would also suggest adding loop feedback to control gain and reduce distortion.

 

[celestar32]

I just want to know, do you intend to drive the screen grid of the EL34 instead of the control grid (pin 5 instead of pin 1)?

Otherwise, I would suggest trying the ultrapath feedback network in the output stage. You'd need one choke per channel for that.

I would also suggest adding loop feedback to control gain and reduce distortion.

I don't think I want to put extra choke per channel. I want it in triode mode. I will take note of the loop feedback to reduce distortion.

 

[dirkwright]

The extra choke doesn't have anything to do with triode mode it goes in the power supply for the ultrapath feedback. Good luck with your amp.

 

[dirkwright]

Like thus and so. The choke can be any ordinary power supply filter choke since it only has to function at low frequencies. It's wired in series between your power supply and the output transformer.

 

[TDHien59]

Dear all,
My amp El34 SE with UL (43%) designed follow schematics below:
Any good idea for mod this schematics diagram?
Thanks.