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In Reply to: RE: Help: Hammond 272DX 125 Tap not working, but 115 is working. posted by banpuku on September 23, 2016 at 13:58:42
If you're sure of your mains wiring, you'll need to test the Hammond with an Ohmmeter. The white, gray and black wires should all have continuity. If not, the transformer is defective.
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Buy Chinese. Bury freedom.
Follow Ups:
I just checked, all three wires DO have continuity. Any other thoughts?
2 alternatives in case the 125V tap is not working:
1. put in a #47 light bulb after the fuse to reduce voltage by 6V.
2. get a new transformer. In your opinion, Mr. Triode_Kingdom, is the power transformer a critical component that should be updgraded from a Hammond product? Or is Hammond as good as it gets? I have Hashimoto OPTs and wondering if a Hashimoto PT, or other brand, would have sonic improvements.
Did you unsolder all the leads before measuring with the ohmmeter? If so, you've connected something wrong. Inserting any resistance in series (like a lamp filament) will degrade regulation. Some people use a bucking transformer, which has less negative effect. If you want to discuss Hammond vs other brands, that should really be a different thread.
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Buy Chinese. Bury freedom.
Statistically, it's most likely you made a bad solder joint. Just sayin' ... :^)
Paul, you were correct. Except, it was a bad solder job by Hammond. See my update to the original post.
unplug EVERYTHING and check resistance of primary across white and black. should be 2.869 ohm + or - 20% at room temp, according to link
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