![]() ![]() ![]() Do this again using another starting wire, and continue until you have measured all possible wire to wire combinations, AND you have found the highest resistance. As you do that write down the dc resistance values between each pair.įor instance, if you picked the Black wire as your starting wire, you might have something like this:ģ. ![]() Pick any of the primary wires and measure to each of the other wires. If it's autoranging, don't worry about it.Ģ. Ohmmeters use the most current on the X1 ohms range, but the X10 range should have enough resolution for the task, so use it instead. When testing low level audio transformers, It's generally a good idea to try to keep the DC test current as low as possible to avoid causing any magnetic build-up in the core. Use a digital ohmmeter and set it to its X10 range. To identify the primary winding taps, try this.ġ. You should be able to figure ot the windings and the input taps with a ohmmeter.Īs you surmised, the Blue and white wires are probably the secondary (grid) output and the secondary common (ground). The Stancor A-4351 is a standard mic to grid transformer. Whew, A Masco MA-8 is beyond "vintage" and well into "antique". ![]()
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