UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Neil Purling · 13th Jul 2006, 6:35 pm

I was wondering if I could squeeze some more volume out of the circuit.
The design we both borrowed utilised a EBC33 triode part, and that offers more gain than the 6J5 we used. The volume does not increase after around 60% of the volume control travel.

You used a different regenerative detector. I do not know at present how much gain the EF39/6K7 RF Pentode gives, or if a EF91 would do any better.
I suppose there is only one way to find out.........
The only real way to find out would be to use a RF signal gen & scope in a bench test. I have neither item.

13th Jul 2006, 6:35 pm	#18
Neil Purling Nonode Join Date: Jul 2005 Location: Hull, East Yorkshire, UK. Posts: 2,087	Re: Regarding home made TRF I was wondering if I could squeeze some more volume out of the circuit. The design we both borrowed utilised a EBC33 triode part, and that offers more gain than the 6J5 we used. The volume does not increase after around 60% of the volume control travel. You used a different regenerative detector. I do not know at present how much gain the EF39/6K7 RF Pentode gives, or if a EF91 would do any better. I suppose there is only one way to find out......... The only real way to find out would be to use a RF signal gen & scope in a bench test. I have neither item.