Output Transformer

Paul Smith · Post by **Paul Smith** » 3 Jun 2023 3:20 pm

Hello, I had a question regarding a Fender Output Transformer: Codes 022889 and 606930, Im not sure if that would be 30th week of 1969 or 1979? I measure resistance in the primary from the Center Tap Red, to blue, which measured 35 ohms, and Center tap Red, to Bronws which also measured 35 ohms, however measuring from Brown To Blue, does not show an ohms reading, just O.L on my DMM. Is this ok? The Blue and Brown wires of the primary are the wires that connect to the plates of the Output Tubes. The Secondary wires which connect to the speaker output, measures at .5 ohms. I think all this is ok, but perhaps an expert could chime in?

thanks very much,

Paul Smitty Smith

Bill A. Moore · Post by **Bill A. Moore** » 3 Jun 2023 4:46 pm

What scale is your meter set for?

Paul Smith · Post by **Paul Smith** » 3 Jun 2023 5:50 pm

Its a flike 87 DMM set to ohms resistance, i do not think you can set the scale

Donny Hinson · Post by **Donny Hinson** » 3 Jun 2023 9:19 pm

First off, that’s a 1969 transformer. Second, what you describe with the ohms readings cannot happen unless there’s an intermittent connection somewhere. Could be in the meter leads, or in the transformer leads. Try again with the meter leads firmly fastened to the transformer leads. Then wiggle to see if the readings change.

If a=16, and b=16, then a+b has to equal 32.

Bill A. Moore · Post by **Bill A. Moore** » 4 Jun 2023 5:25 am

An 87 is auto ranging, unless the "range" button is pressed, (sometimes inadvertently), don't ask me how I know!

Dave Grafe · Post by **Dave Grafe** » 4 Jun 2023 6:56 am

What Donny said

Paul Smith · Post by **Paul Smith** » 4 Jun 2023 1:28 pm

Thanks very much for your input, I cut off/stripped some insulation off of the ends of the Blue, and Brown wires, and I can now get a reading between the 2 wires.

thanks for all your help!

Smitty