The problem may be coming from the grounded-emitter transistor stages, which make good AM demodulators (like having a radio tuned to all the stations at once).
Might try lifting the emitter leads on the small transistors and tack in some small resistors (perhaps 470 ohm) and see if that helps. An input resistor can also help, in the range of 1k-10k.
Good Luck!
Might try lifting the emitter leads on the small transistors and tack in some small resistors (perhaps 470 ohm) and see if that helps. An input resistor can also help, in the range of 1k-10k.
Good Luck!