A) Visual Checks
(click for high res image)
There were five visible
- The power cord
insulation was badly cracked, taped up and needed replacement.
- The speaker wires
were exposed at the point where they came through the chassis.
- There was a
"mystery wire to no where."
- This cap wasn't
original; how old is it?
- Something black is
oozing from this bakelite "universal" capacitor. That can't
I replaced the power
cord and speaker wires, and removed the "mystery wire." I just
assumed that the cap (4) was suspect, and needed replacement.
The slightly oozing tar
filled "universal condenser" would be a mini project on it's own.
I tackled this (with help from the Philco
Repair Bench) as part of the complete electrical
B) Spot Checks
I checked the power transformer with an ohm meter. The schematic
identifies the nominal resistances, and as long as my ohm meter didn't indicate
a short or open winding, I was happy. There are 5 distinct windings, and
the largest deviation was a reading of 197 ohm instead of the prescribed 130
I spot checked resistors with an ohm meter.
(You'll need to be able to read the
schematic pretty well for this, otherwise you'll be fooled by loops and nearby
capacitors). I found several resistors that were off by more than 20%, but
nothing open or shorted.
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