15-07-2022, 06:11 AM
Well done Adrian.
I have not made a complete superhet with them although I have some modules that I have made. I have a circuit using a 1j37b as a mixer which I have tested. It is a hybrid with transistor output driving a ceramic filter though so not purely valve. Apart from the selectivity it got me round the transformer issue a bit. To get size down a little, and for better stability, I have been experimenting with these tubes (and traditional ones to some extent) with manhattan style layout and surface mount components. Size wise I find I get little difference as I can pack them using conventional tequniques but it should be far better for the higher frequencies.
Tracy
I have not made a complete superhet with them although I have some modules that I have made. I have a circuit using a 1j37b as a mixer which I have tested. It is a hybrid with transistor output driving a ceramic filter though so not purely valve. Apart from the selectivity it got me round the transformer issue a bit. To get size down a little, and for better stability, I have been experimenting with these tubes (and traditional ones to some extent) with manhattan style layout and surface mount components. Size wise I find I get little difference as I can pack them using conventional tequniques but it should be far better for the higher frequencies.
Tracy
