Triplett 631 AAAA adapter
Triplett 631 AAAA adapterby svschmitt.
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Shared on August 14th, 2016 21:44.
These PCBs are for battery packs to power a Triplett 631 vacuum tube voltmeter.
Three PCBs replace two XX15 batteries.
For more information, see http://stuartschmitt.com/triplett631/.