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Speco Portable Signal Tracer
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05-23-2014, 07:01 PM
jr_tech
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Join Date: Sep 2009
Posts: 4,520
The 3S4 has a center-tapped filament so it can be connected to work at *either* 1.4V at 0.100 amp *or* 2.8V at 0.050 amp.
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