ampage Tube Amps / Music Electronics	For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

previous: R.G. Sure. Wherever you have a cathode f... -- 1/10/2000 7:58 PM

Re: Cathode follower drive to output tubes

1/10/2000 9:14 PM
lion	Re: Cathode follower drive to output tubes Wait a minute RG – let me get this straight! Does it mean that I can use an IRF820 – no, two IRF820’s it must be – hooked up with the drain’s to 450V B+ and –50V at the cathode’s. Could it be that they could even be connected to the same B+ as the PI tube or the power tube plates ... – no there has to be a seperation with a dropping resistor and a decoupling cap – right? What about the cathode resistors – value? And no heater current problems - and drilling big holes in the chassis. This solid state (why is it that I don’t like this word) solution would certainly be a lot easier to implement – I’m really tempted. Thanks for the suggestion. Regards Lion

1/10/2000 9:14 PM

lion

Re: Cathode follower drive to output tubes

Wait a minute RG – let me get this straight!

Does it mean that I can use an IRF820 – no, two IRF820’s it must be – hooked up with the drain’s to 450V B+ and –50V at the cathode’s.

Could it be that they could even be connected to the same B+ as the PI tube or the power tube plates ... – no there has to be a seperation with a dropping resistor and a decoupling cap – right?

What about the cathode resistors – value?

And no heater current problems - and drilling big holes in the chassis.
This solid state (why is it that I don’t like this word) solution would certainly be a lot easier to implement – I’m really tempted.

Thanks for the suggestion.

Regards
Lion

Replies:

R.G. q{Does it mean that I can use an IR... -- 1/11/2000 4:04 AM