Quote:
Originally Posted by jr_tech
As I understand it, the series connected 300 ma tubes are arranged in 2 parallel strings to total 600 ma that feed the CRT heater (600 ma) and the 6J6s (450 ma shunted with resistors to make 600 ma).
jr
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You are correct. There is a Candohm resistor inside the tuner which is a 2 section resistor. One section is 27 Ohms (measured) in parallel with the 6AG5 300ma heater pins, and the other is 47 Ohms (measured) in parallel with the 6J6 450ma heater pins. This then allows 600ma through the tuner string. There is also that 1 resistor on the outside. That is 15.6 Ohms (measured) which is in series of the entire filament string. Bringing the entire filament string to handle up to 130V.