29-06-2020, 07:11 PM
Hi
Thanks Tracy and Michael.
I've scrapped the idea of using the 1Ж42А for a mixer in the meantime. So today I used one as an RF amp from a ferrite rod antenna and tuning cap with a little positive feedback from the G2 and HT of two turns around the ferrite rod. The anode was loaded with a 2mh choke. The stage worked well with only RF on the anode, using a set of high impedance phones, coupling cap and a germanium diode I was able to receive half a dozen stations with no external aerial. Three were well loud enough for comfortable listening, performance being far more than I expected. Later I added another 1Ж42А wired as a leaky grid detector, the result was disappointing. I then decided to use the germanium diode as the detector and the second stage as an audio amp. The results are truly brilliant, I'm sitting in the living room listening to Spirit Radio from Ireland at good volume. I'll put up the circuit tomorrow.
Thanks Tracy and Michael.
I've scrapped the idea of using the 1Ж42А for a mixer in the meantime. So today I used one as an RF amp from a ferrite rod antenna and tuning cap with a little positive feedback from the G2 and HT of two turns around the ferrite rod. The anode was loaded with a 2mh choke. The stage worked well with only RF on the anode, using a set of high impedance phones, coupling cap and a germanium diode I was able to receive half a dozen stations with no external aerial. Three were well loud enough for comfortable listening, performance being far more than I expected. Later I added another 1Ж42А wired as a leaky grid detector, the result was disappointing. I then decided to use the germanium diode as the detector and the second stage as an audio amp. The results are truly brilliant, I'm sitting in the living room listening to Spirit Radio from Ireland at good volume. I'll put up the circuit tomorrow.
