![]() Not having one on hand but wanting to go ahead with the change I used a 12.6V filament transformer wired up backwards so the usual 117V primary now becomes the new HV secondary winding and the transformer's 12.6V filament winding goes to the 12.6V filament connection of the EICO power transformer. These are still around and not so expensive. ![]() A small 125VAC 15mA power transformer could do the job. The voltage can be anything from 100V to 250V DC. The current demand is small-not likely to exceed 5 mA. Stopping short of replacing the power transformer I came up with the idea of adding a small transformer just to power the 1629 tube triode plate and target circuits. ![]() Not being fully content with the circuit, results and performance of the late model EICO 950A cap checkers (high serial number), I've been thinking about a way to separate the power supplies for the 1629 eye tube and leakage tests.
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