Re: Mystery suitcase & unknown chassis
I remember seeing some PL36s used with a hunky transformer as a DC-to-AC inverter (for those people who still had DC mains but needed to run AC-only radios/tape-recorders/tellies) They're beefy and work well as output-valves. Not seen them used single-ended, push-pull AB2 is definitely an option though! I've also seen them used as RF linear-amplifiers.
50L6 is a power-output bottle but nowhere near as beefy as a 6L6; it's probably closer to a 6V6. Commonly used in US 'midget' radios with series heater-strings.
CBL31 was intended for cheap superhets: the diodes are for detector/AVC and the pentode-bit is a relatively-high-slope one so it can be driven directly from the detector.
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