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Old 09-25-2010, 10:16 PM
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radiotvnut radiotvnut is offline
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Panasonic AC/battery radio/phonograph

A friend gave me this Panasonic model SG-773 AM/FM radio/record player after it finally died completely. It will run on 120VAC or 6 D cell batteries. Several years ago, he asked me to fix a loud hum, which turned out to be a bad filter cap. The phonograph didn't work then and he said not to worry about the phonograph, as it had not worked in ages and he didn't have any records left to play on it even if it did work. He claimed he bought this sometime in the late '60's; but, who knows. If anyone else has any input as to when this was made, I'd appreciate it since I'm finding very little on the Internet about this record player.

The other day, he called and said it died and he wasn't fooling with it anymore. I plugged it in and I get no reception on AM or FM. In phonograph mode, the platter does not turn; but, I can turn the record by hand and hear faint, distorted sound from the speaker. At this point, I suspect a full recap is in order. The turntable plays at 33 and 45 rpm and there is a badge inside the record playing compartment that reads "solid state electronic RPM control". I have not removed the turntable platter; but, it appears to be idler driven and there is a button that is pressed down, when the lid is closed, which disengages the idler wheel. I hope the problem is not with the motor itself, as I don't know where one would find a replacement motor for this unit. The tonearm is fairly heavy and looks to have a cheap ronette cartridge with a needle that's held in place by a setscrew. I really don't think I want to play my prized records on this; but, it would be neat if I can get it operational again if for no other reason than to show kids that this was what people carried around as a portable music device before the days of MP3 players, Ipods, portable CD players, etc. And, battery operated record players are something that I don't find that often. All I have now is a mid '60's Mercury/Philips 3 speed portable, a circa 1980 Mickey Mouse two speed "close & play" portable, and the Panasonic that I just got. I bought the Mickey Mouse one off of ebay because I had one like it when I was very young.

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Old 09-26-2010, 12:07 AM
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Findm-Keepm Findm-Keepm is offline
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I may have the service manual on microfiche at work. Lemme check for you on Monday.
As for the motor, in the end bell of those Panasonic/National motors, there is a tiny circuit board with a pot, two or three resistors, a metal can transistor (2SB172 or 2SB324 IIRC), a disc cap, and a pot. The transistor will develop leakage and eat the pot or one of the resistors. The resistors are little grey colored things with no markings. Modern Mabuchi motors won't directly replace them - you'd probably be able to identify a motor that would work, but have to fashion a mount. MCM used to carry them - they may still. It's either a 6V or 9V motor, my bet is on 6V, fairly common back then. Most of the 6V motors were identical from product to product, just with different brass pulleys or idler shafts.
Somewhere I may have one, albeit without the circuit board...

USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"

When fuses go to work, they quit!
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Old 09-26-2010, 01:50 AM
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Thanks for the info and if you can find that SM, I'd really appreciate it as I'm sure it will help me repair this animal.
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