[Milsurplus] BC-9: Is It Halloween??

[Hubert Miller]

Oh - and my thinking is: 
To try to replicate original operating characteristics, you must use batteries for all 4 voltage sources. No external supplies.
And, you must use a filamentary ( DC ) tube, no tube with a cathode. Because i think a certain amount of RF is coupled 
back into the circuit via the filament. I think you're kind of chasing your tail, without setup as original as possible.

I think to bring it down to 3500 kHz, instead of a larger loop, why not just put a mica across the loop connections? 

Dale VE3LYX, wrote about a regen receiver where he jumpered the regen control pot with a jumper wire about 10 inches
long, and it caused the frequency to shift 19 kHz. RF does funny things; it kind of pours all over where it can, and turns up
all kinds of odd reactances. 
-H