09-27-2013, 10:40 PM
It is strange that the BFO circuit no longer oscillates. Did you change any parts in the circuit?
I am surprised that they used a 22k grid leak resistor for a low transconductance battery tube like a 1U5, as it loads down the tuned circuit and there is not much gain to spare. You might try a 47k or 100k instead and see if it makes a difference.
I am surprised that they used a 22k grid leak resistor for a low transconductance battery tube like a 1U5, as it loads down the tuned circuit and there is not much gain to spare. You might try a 47k or 100k instead and see if it makes a difference.
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