previous: R.G. q{Just break that connection and in... -- 1/10/2000 5:22 PM

Re: Cathode follower drive to output tubes

1/10/2000 7:18 PM

lion

Re: Cathode follower drive to output tubes Thanks for the fast replies!     Randall.   Sounds like it would be worth a try.   I’m not sure about the extra 300mA load on the filament supply though. I don’t have the specs on the PT – it’s from an old Selmer amp with 4 x 12ax7’s – which is also what I have now. Would it seriously damage anything to give it a try, or could I in anyway verify if it’s feasible? The alternative would be a seperat filament transformer for the extra tube - I guess.     Regarding the negative supply to the cathode resistor. Is it OK with –50V, otherwise I could tap off the bias supply at an earlier stage (–77V) maybe in a parrallel line with a small dropping resistor and a cap – how much additional filtering would be needed?   Last thing - what’s the value of the cathode resistor.     Thanks and sorry for all the questions.     RG   ??? – could you elaborate a little on this one. Thanks.     Regards   Lion

 

Replies:

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