11-07-2016, 04:25 AM
That reminds me, I have a few late 1950s and early 60s car radios I need to test that use those sorts of tubes with the 12 volt plate and screen voltages. I think that they work on the space charge principle, but in most of the North American car radios the final output is a power amp transistor, not a tube like that write up about the ECC86 mentioned.
Regards
Arran
Regards
Arran