[Milsurplus] [ART-13_Transmitters] Working on my ART-13's

[J. Forster]

This is PURE SPECULATION.

My suspicion is that some metal ions diffuse from the cans into the oil.
These metal ions slowly catalyze the breakdown of the oil into into other
compounds, which in turn hasten the attack.

FWIW,

-John

===================



> Great ideas on the Caps.   I have been working on quite lot of SCR 274N
> equipment lately and have found that many of the caps, the oil filled
> cans,
> in the receivers, modulators, and in a couple of transmitters have failed
> or
> soon fail with power applied.  I always bring up the equipment with a
> variable current limited supply.  Of course pulling the brushes in the
> dynomonsters, and bring up the voltage slowly, watching the current, which
> should rise, and then fall.  After bringing up to voltage, run for at
> least
> 6  or so hours.  Then touch the cans.  They usually are puking a greeinish
> yellow substance.  Upon taking them apart, it seems there is a chemical
> reaction taking place between the can and the oil. The resulting green goo
> is conductive.  So, the result, not only the cap leaks, the can leaks.
> Much
> of this equipment was working fine business as late as 4 or 5 years ago.
> I
> have a complete test setup for the units and have tested them and ran them
> quite often.  It appears that at that at the age of 65 to 70 years old,
> these caps are failing in large numbers.  At least I have found that to be
> true in the command sets.
>
> BTW, I run all the equipment here from Dynamotours.  I have a BC 191 and
> ART
> 13, BC 348 and BC 312 currently on the air on the AM nets.  Also a TCS is
> set up nearby on the Dynamotours.
>
> WA4VAG
> Joe Munson
>
>
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