12-31-2010, 09:36 PM
John hit the nail on the head. I have a Canadian Philco 1940 year book...your Model 21 is a 1940 model, not 1939. (It would have been introduced in June 1939 as a 1940 model.)
Looking at the schematic, I see that Canadian Model 21 is electronically equivalent to USA Model 40-195.
39-6445E is not a valid model number in the USA or Canada. That is a part number for a sticker, probably the tube layout sticker.
The hum is probably caused by faulty electrolytic capacitors. You'll have to replace all of the paper and electrolytic capacitors for safety and reliability.
You will have to check and see if the wiring under the chassis is insulated with rubber or not. Philcos made in the USA between 1939 and 1942 used rubber insulation on the wires, and that stuff dries out and falls off over time. Yours may use cloth insulation? I have a Canadian 39-330AT, and its wiring under the chassis is mostly cloth, not rubber. The only rubber insulation it had were the wires coming out of the IF transformers.
Looking at the schematic, I see that Canadian Model 21 is electronically equivalent to USA Model 40-195.
39-6445E is not a valid model number in the USA or Canada. That is a part number for a sticker, probably the tube layout sticker.
The hum is probably caused by faulty electrolytic capacitors. You'll have to replace all of the paper and electrolytic capacitors for safety and reliability.
You will have to check and see if the wiring under the chassis is insulated with rubber or not. Philcos made in the USA between 1939 and 1942 used rubber insulation on the wires, and that stuff dries out and falls off over time. Yours may use cloth insulation? I have a Canadian 39-330AT, and its wiring under the chassis is mostly cloth, not rubber. The only rubber insulation it had were the wires coming out of the IF transformers.
--
Ron Ramirez
Ferdinand IN
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
