I have an old Edison 7R that I found a schematic for but shows 6 tubes where I have 5 and shows many other things that I don't have, like a phono plug. The schematic I found is here http://bentongue.com/edison/Service_manual_for_Edison_Radios_R6_R7.pdf
Was wondering if anybody has a better schematic or info on it. The main problem I have is getting into several metal boxes pined to the chasis that contain bad capacitors that I need to replace, assuming I can figure out what type of capacitors they are.
Wayne Parham Messages: 18790 Registered: January 2001
Illuminati (33rd Degree)
Wow, that's cool! But I'll bet it's a booger to align.
What tubes are missing? I wonder if it has been completely rewired, maybe even made into a newer circuit type.
Once I had a Stewart Warner radio that had been rewired to make use of an alternate output tube. I'm sure a repair shop rewired it to make use of a tube they had in stock that had different pinouts.
Amazingly no tubes where missing when I got it, but I did replace 2 227's that read weak. And after replacing a very bad power cord and slowly bringing up the voltage I do get (and only get) a 60hz hum. So all thats left to do now it take a hammer to it or something so I can get to the capacitors inside the metal boxes. They are held on by what looks like non removeable pins since they probly thought nothing bad would ever happen to them old capacitors COUGH COUGH yeah riiight!
Wayne Parham Messages: 18790 Registered: January 2001
Illuminati (33rd Degree)
You said the schematic shows six tubes yet your chassis only holds five. I was asking what the differences were, what tube was missing or if the whole circuit (maybe even the whole chassis) is different.
Wayne Parham Messages: 18790 Registered: January 2001
Illuminati (33rd Degree)
That is so, so cool! Love the cotton insulated wire. Chassis looks like it's in pretty good shape, just needs a little cleaning.
The 60Hz hum symptom is a pretty common one. It can mean just about anything. Could be as simple as coupling caps gone bad, and if they haven't been replaced, that's likely. I generally replace all paper/oil caps with polys, first thing. Could be a tube too, or alignment, but I'd start with the caps.
Oh yeah and the tubes in her do read good. But now getting them boxes off the chases held on by pins is another story. The cap's in them are so bad, wax leaked outa the boxes and onto the power supply that took some cleaning.
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that took some cleaning.
