(07-07-2025, 11:38 AM)Podbuilder Wrote: So here's where Im at... PCB done and donor coil/cores ready to wind. 3D printed bobbins and purchase most the components although I wasnt real happy with hFe readings on some of the germaniums.
It's a nice looking board
hFe readings on Germaniums generally are very low as compared to current silicon. Modern meters often don't cope with them either. I think it's probably their very high leakage, numbers of microamps, as compared to hFe's often of twenty or less. Power transistors can be even worse.
I have an old analogue meter which tests them Ok but when I tried some with a modern digital meter I had I got no sensible readings.
Tracy







