[ARC5] ARC R-511 Capacitor Failure

[Cliff Miller]

I recently acquired an ARC R-511 Type 12 receiver, 190-550khz, with
dynamotor.  The receiver appeared used but relatively clean. After some
initial checks, I serviced the dynamotor bearings and then applied power.
The receiver worked long enough to run up and down the band a few times
looking for my local NDB.
After several minutes there was a loud bang and the radio actually hopped
off the desk an inch or two.  The dynamotor kept running but I shut things
down quickly.
C-634, a 5mfd dated 2-56 on the high voltage bus, had expelled its'
contents inside the radio.  Nothing else appears damaged.
I've run other Type 12 radios for hours without re-capping.  What's the
history with these?  Comments welcome!

-- 
Cliff Miller W4HGR
cliff52 at gmail.com
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