[Amps] Westinghouse BC Ammeter QX-37

[Jim Kearman]

From: HAROLD B MANDEL <ka1xo at juno.com>

> 1. Will this ammeter be able to handle 2545 volts?

You shouldn't be connecting it in the plate lead. Measure the cathode current, which is at low voltage. 

> 2. Does this ammeter need another external shunt?

What's the resistance measured across the terminals? If it's a 2-A meter it should be pretty low, a fraction of an ohm. You could test with a variable dc supply, a series resistance bank, and a separate meter with known calibration, like a DVM. You don't have to go all the way to 2 amps. If both meters read, say, 100 mA, at the same time, you know the scale calibration is correct. 

73,

Jim, KR1S