Thanks for trying out my suggestions. You couldn't make it work it but it is still as I said, an early version of what later will be the function of the receiver BFO. It was well known that BH tubes generated RF noise, (see the 1937 Raytheon tube manual). Here some clever person turned a problem into a feature by making use of the noise, maybe anticipating later noise diodes such as the Sylvania 5722. Using a buzzer to excite a tank circuit for testing and detecting CW signals was also a known practice. This is a very cool device. It would be worthwhile to spend more time trouble shooting it. I would love to see you demonstrate it working.
It could be that the tube is faulty, only one side of it is conducting and it should have both sides conducting as it is a full wave rectifier. I've ordered another one (pre 1925) and I'll try that one after I get it.
Perhaps. The two fat pins on the tube are the anodes I should have written that the ring of the phono jack goes to positive. I also wonder if the main capacitor section setting got changed after measuring the resonance.
Thanks for trying out my suggestions. You couldn't make it work it but it is still as I said, an early version of what later will be the function of the receiver BFO.
It was well known that BH tubes generated RF noise, (see the 1937 Raytheon tube manual). Here some clever person turned a problem into a feature by making use of the noise, maybe anticipating later noise diodes such as the Sylvania 5722. Using a buzzer to excite a tank circuit for testing and detecting CW signals was also a known practice.
This is a very cool device. It would be worthwhile to spend more time trouble shooting it. I would love to see you demonstrate it working.
It could be that the tube is faulty, only one side of it is conducting and it should have both sides conducting as it is a full wave rectifier. I've ordered another one (pre 1925) and I'll try that one after I get it.
Perhaps. The two fat pins on the tube are the anodes I should have written that the ring of the phono jack goes to positive. I also wonder if the main capacitor section setting got changed after measuring the resonance.