23-09-2021, 10:22 PM
(This post was last modified: 23-09-2021, 10:30 PM by Mike Watterson.)
I don't know. I do know that on some sets where I replaced the DF96 by 1j24p that it was only stable with an added resistor from g2 to f- (or f+) to set the voltage at about 40V. It was motor-boating.
I did mean to try the 1j24p at 12 to 18V (2x PP3 to exhaustion) with a centre tap transformer on g2 and anode for RF, IF and also AF preamp to see did it improve performance. But I never actually even thought it through fully, maybe a silly idea. Certainly they do work tying g2 to anode and pretending it's a triode.
It's a unique type of valve that is pentode like. The susceptibility to magnetic fields is significant and the versions with the g1 plates connected separately are strange, where a differential voltage in EITHER direction reduces the output.
I did mean to try the 1j24p at 12 to 18V (2x PP3 to exhaustion) with a centre tap transformer on g2 and anode for RF, IF and also AF preamp to see did it improve performance. But I never actually even thought it through fully, maybe a silly idea. Certainly they do work tying g2 to anode and pretending it's a triode.
It's a unique type of valve that is pentode like. The susceptibility to magnetic fields is significant and the versions with the g1 plates connected separately are strange, where a differential voltage in EITHER direction reduces the output.
