Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Masterwaiter on January 24, 2019, 10:00:01 am
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So my 5e3 build saga continues. Trying a different power transformer, so new post. I have all the windings id’d and wired in, but I have these two brown wires that are confusing me. This winding is not the high voltage centertapped winding and when I power the transformer out of the circuit, just one brown lead to ground is giving me a voltage reading so high that my multimeter won’t even register it. My suspicion is that the transformer is shorted, but I just wanted to run it past wiser men than myself in case I’m looking at something beyond my knowledge. I promise that this is my last attempt to make this amp work with junk I have on hand before I order a new classic tone with proper specs.
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Measure resistance between the two brown wires. Then measure resistance between one brown wire and all the other wires. Probably infinity ohms. Measure resistance between one brown wire and the bolts on the transformer. Probably infinity ohms. Report your resistance readings.
Now measure voltage between the brown wires. Several PTs have a separate bias winding and the wires are brown. Show us the data sheet for that transformer. Or at least tell us which PT you have.