ECL / PCL 82 Amplifier PCB

[Mike Watterson]

The radios often used either a combined diode in preamp valve, or if FM, three diodes (EABC80), so usually only needed a pentode alone on the output. Some sets didn't even have a triode preamp (short superhets). A few AM only sets used EBFxx final IF and so could use a triode--pentode.
Of course some record players had a high output cartridge and no triode.