14-07-2022, 07:59 PM
This has kept me occupied for several days, probably over a week, making IF coils and Osc coil, winding the ferrite aerial, making up a spreadsheet so I could work out the values for the Osc to track the aerial tuning, or best I can anyway. All part of the learning experience.
Looking at the board, it is a bit of a Frankenstein, with trimmer caps strapped to allow for adjustment, wires bridging sections etc.
But it works and has been a very satisfying little project.
6 x 9 Volt battery for HT 4.4 mA HT current.
3 x 1J18B valves, 1 for local Osc, mixer and RF amp. 1 for IF stage and 1 for driving a speaker, 1 Ge diode for detector.
if anyone knows of a Ki-cad library that includes the rod valves I could draw out a circuit.
Inspiration came from http://www.hi-ho.ne.jp/ux-45/russian.html now if only I could get things that small?
Adrian
Looking at the board, it is a bit of a Frankenstein, with trimmer caps strapped to allow for adjustment, wires bridging sections etc.
But it works and has been a very satisfying little project.
6 x 9 Volt battery for HT 4.4 mA HT current.
3 x 1J18B valves, 1 for local Osc, mixer and RF amp. 1 for IF stage and 1 for driving a speaker, 1 Ge diode for detector.
if anyone knows of a Ki-cad library that includes the rod valves I could draw out a circuit.
Inspiration came from http://www.hi-ho.ne.jp/ux-45/russian.html now if only I could get things that small?
Adrian
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve