You know... little directly heated guys: 1T4/DF91, 1U5/DAF92, 3V4, 3S5, etc. I had a few in pentode and triode mode traced out in Curve Captor, but my hard drive crashed and I lost them... and i have not reinstalled Curve Captor or any of the Tcl support... or even my full operating system.
if anyone has some, I'd greatly appreiciate it.
if anyone has some, I'd greatly appreiciate it.
I can't help with Spice.
The tube complement I can help with. 1R5 pentagrid converter as combined 1st detector/local oscillator. 1T4 remote cutoff pentode as IF amp. 1S5 diode/pentode as 2nd detector/AGC rectifier and AF voltage gain. 3S4 as audio O/P.
67.5 V. B+ is enough. You'd want 90 V. B+ for a 3V4 "final".
If you can scrounge up a 3 section tuning cap., a 1U4 TRF gain block will IMPROVE image rejection.
The tube complement I can help with. 1R5 pentagrid converter as combined 1st detector/local oscillator. 1T4 remote cutoff pentode as IF amp. 1S5 diode/pentode as 2nd detector/AGC rectifier and AF voltage gain. 3S4 as audio O/P.
67.5 V. B+ is enough. You'd want 90 V. B+ for a 3V4 "final".
If you can scrounge up a 3 section tuning cap., a 1U4 TRF gain block will IMPROVE image rejection.
Eli Duttman said:
Thanx. I am trying to spice a few things to improve my understanding and to experiment... for example, I still can't get simple AVC like you see in these old radios to work right unless i dupe a previous circuit. i also have piles of those little directly heated pentodes around and want to experiment with them a bit, but would rather spice the whole thing first.
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