01-10-2016, 09:03 AM
(This post was last modified: 01-10-2016, 09:09 AM by Mike Watterson.)
Valves:
Entirely 1j24b and 78V - 80V HT from CR2032 (parallel stacks with 1N4148), or safer use PP9.
OR
Hybrid set using maybe 1 off 1j24b for VHF mixer/osc if 1j42a doesn't work. Otherwise all 1j42a. Use TBA820 or 8 pin stereo head phone amp (they are not just SMD, 8 pin DIL are on eBay) in bridge.
Investigate safer A23 or similar 12V batteries (about size of N / Lady cell) in series and parallel with 1N4148, stacks of CR2032 are dangerous, though nice fit for a B101.
Note, don't operate 1j42a above 9V!
If using alkaline batteries for filament rather than NiMH, then put 39 or 43 ohms in each f- lead, (1j42a or 1j24b). They are designed for Silver Zinc and NiCd power.
You'd use 1j29b as front end RF preamp and a pair in push pull for audio out on a high performance set with Shortwave.
The 1j29b in Push Pull will also do RF transmit up to nearly 3W peak (SSB).
The 1p24b are shorter life high power (hence 220mA parallel, 110mA serial) for radar in proximity fuses up to 200W peak! You can run them about 16W to 20W total power out as a pair in class B push pull RF. Perhaps 10W reliably class AB at good quality audio.
Entirely 1j24b and 78V - 80V HT from CR2032 (parallel stacks with 1N4148), or safer use PP9.
OR
Hybrid set using maybe 1 off 1j24b for VHF mixer/osc if 1j42a doesn't work. Otherwise all 1j42a. Use TBA820 or 8 pin stereo head phone amp (they are not just SMD, 8 pin DIL are on eBay) in bridge.
Investigate safer A23 or similar 12V batteries (about size of N / Lady cell) in series and parallel with 1N4148, stacks of CR2032 are dangerous, though nice fit for a B101.
Note, don't operate 1j42a above 9V!
If using alkaline batteries for filament rather than NiMH, then put 39 or 43 ohms in each f- lead, (1j42a or 1j24b). They are designed for Silver Zinc and NiCd power.
You'd use 1j29b as front end RF preamp and a pair in push pull for audio out on a high performance set with Shortwave.
The 1j29b in Push Pull will also do RF transmit up to nearly 3W peak (SSB).
The 1p24b are shorter life high power (hence 220mA parallel, 110mA serial) for radar in proximity fuses up to 200W peak! You can run them about 16W to 20W total power out as a pair in class B push pull RF. Perhaps 10W reliably class AB at good quality audio.
