I'm looking for the diagram for a Philco radio/record player combo "HiFI". The circuit board is marked 54-6280-7, which seems consistent with normal Philco model numbering system. It looks like a typical 5 tube superhet built on a PCB, two speakers. The filter shorted and took out the output transformer, rectifier and couple of resistors. Other numbers: 11291-1 and 2680805.....thanks, nb

Number from the circuit board isn't much to go on. Make sure there isn't a paper sticker on the back or inside the cabinet showing a model or chassis number. Go to samswebsite.com to see if schematic is available.

Richard

:Number from the circuit board isn't much to go on. Make sure there isn't a paper sticker on the back or inside the cabinet showing a model or chassis number. Go to samswebsite.com to see if schematic is available.
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:Richard
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Well, there is a paper sticker, BUT where the label indicates "model:" they glued the serial number, and there's nothing underneath that. The serial# is SC98139, there's a rubber stamp on the cabinet that has two #'s: 11291-1, and CAB 260805, which I assume are cabinet styles, My current problem is that I've replaced all the electrolytics, tubulars, and resistors that are out of value, tested the tubes, checked the IF's for continuity, it lights up, gives off a low 60 cycle hum as it should, but no sound, not even with the finger test. Suggestion? thanks, nb

You could use any AA5 schematic with the same tube line up. Trouble shoot the radio using that schematic for voltage pin out. Oscillator negative volts on grid one Ect. Does the set make a buzz when you touch the center lug of the volume control? If so the audio amp section is working. If the amp section is working you can use that as a signal tracer with a diode to back trace the signal path. This is a low tech way if you do not have any test equipment.

Your mention of circuit board and hi-fi suggests a 1960's set. The link below does a database search with a few tubes of a radio's tube complement and creates a list of possible models. Select Howard Sams Red Book database or all 3 databases. It will be a long shot but nothing to lose. Richard

http://www.grillecloth.com/sylvania/tubelist.php

:Your mention of circuit board and hi-fi suggests a 1960's set. The link below does a database search with a few tubes of a radio's tube complement and creates a list of possible models. Select Howard Sams Red Book database or all 3 databases. It will be a long shot but nothing to lose. Richard
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:http://www.grillecloth.com/sylvania/tubelist.php
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Surprise solution to this problem: Pondering the history of this device, I recalled that the access panel had been removed before I got the set. Guess what? Busy little fingers had reversed the 12BA6 and the 12BE6 and TaDa!, it plays like champ. Thanks for your help....nb

12BE6 being in the wrong socket would mean no oscillation and no sound. Glad that mystery is solved. Just leaves the model mystery. Congrats!

Richard