06-07-2020, 09:54 PM
Hello Mike.
From an earlier post....
Thanks for the exposition, I hadn't realized that there was a restriction on the number of valves.
Now that you have said common mode choke, I understand. But to get that to work at AF for a cathode follower wouldn't be easier than other methods of demodulation.
My interest in the more commonly available rod pentodes, or other subminiature filamentary cathodes valves is their possible use as substitutes for the rarer battery valves. Dads Vidor was so equipped for the output stage with a little plug in module using a rod pentode running only half its filament, don't know the details, but one day bravery will allow me to investigate. I recall Dad saying that it was a better performance than the original valve.
You mentioned that there was a vhf superregen one valve pocket set, Dad had a collection of 'vest pocket' sets from the US that he collected when working over there, he had a set like that, but it had two valves, called the 'Hastings FM junior'. There is a similar circuit diagram on the radio museum site.
Amie.
From an earlier post....
Thanks for the exposition, I hadn't realized that there was a restriction on the number of valves.
Now that you have said common mode choke, I understand. But to get that to work at AF for a cathode follower wouldn't be easier than other methods of demodulation.
My interest in the more commonly available rod pentodes, or other subminiature filamentary cathodes valves is their possible use as substitutes for the rarer battery valves. Dads Vidor was so equipped for the output stage with a little plug in module using a rod pentode running only half its filament, don't know the details, but one day bravery will allow me to investigate. I recall Dad saying that it was a better performance than the original valve.
You mentioned that there was a vhf superregen one valve pocket set, Dad had a collection of 'vest pocket' sets from the US that he collected when working over there, he had a set like that, but it had two valves, called the 'Hastings FM junior'. There is a similar circuit diagram on the radio museum site.
Amie.
