Quote:
Originally Posted by Jeffhs
Someone on another antique radio forum (not ARF) told me shortly thereafter the rectifier tube will burn out soon if the radio is operated without the pilot light in the circuit. My question: Is the #47 pilot light in the H511 radios an integral part of the power supply? It must be, if the rectifier tube glows red if the bulb is burned out or is otherwise out of the circuit, but I don't see how, unless the bulb is part of a voltage divider or serves some other function in the B+ power supply.
Thanks much.
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Answer is yes. The pilot lightbulb is wired in parallel with a portion of the 35W4 rectifier heater. Off the hot side of the incoming powerline are connected the pilot light and the 35W4 heater portion mentioned above. Then the pilot light and heater tap in turn connects to the 35W4 rectifier plate. Thru the bulb and heater portion is about 300ma average of current, 150ma for the heater string, and the rest feeds the rectifier and in turn becomes the set's B+. The heater portion will get unhappy with all the 300ma. I think Radio Shack still sells #47 bulbs.
