[Milsurplus] Unknown vibrator supply

[Hubert Miller]

I found this DC to DC vibrator supply, 6 DC to unknown B+ high voltage.
No markings on it whatsoever. Has cable to multi point Jones type connector. Inside
I found a 'job time card' for the Pan American technician working on engines, instruments,
or radio for aircraft DC-3, DC-4, L-49, or B-377, or "Other". Anyone here seen this power
unit before, know what it powered?
thanks-  Hue

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