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IF Transformer Woes [message #25701] Fri, 27 May 2005 01:43 Go to next message
Thermionic is currently offline  Thermionic
Messages: 208
Registered: May 2009
Master
I recently received a Dynaco FM-3 in for repairs that wasn't functioning at all. I found a few broken ferrite slugs in the IF transformers. After some troubleshooting, I found that one IF coil was REALLY messed up. There was no AC continuity through it and no capacitance or inductance that could be measured. I disassembled it to find the coil former had rotated in the base when someone had previously attempted to turn the stuck slugs, and the coils were partially unwound and the magnet wire broken at the connections to the base capacitors.

I have access to a small lathe to turn another identical coil former, and can simply wind new coils on it. But, I still need the 1/4"-28 ferrite slugs. Does anyone know of a source for 1/4"-28 slugs, or replacement IF transformers for the tuner for that matter? I've found #10-32 slugs, but not 1/4"-28.

Thermionic



Tuner repair [message #25702 is a reply to message #25701] Mon, 30 May 2005 15:32 Go to previous messageGo to next message
colinhester is currently offline  colinhester
Messages: 1349
Registered: May 2009
Location: NE Arkansas
Illuminati (3rd Degree)
I have a MD FT-101 that is in need of some TLC. Please email me if you think you can help......Colin (colinhester (at) yahoo (dot) com)

Re: IF Transformer Woes [message #25795 is a reply to message #25701] Wed, 01 March 2006 10:58 Go to previous message
W. Gallagher is currently offline  W. Gallagher
Messages: 1
Registered: May 2009
Esquire
I just read your post and have the same problem - I need to locate 1/4" -28 ferrite slugs for a Dynaco FM-3 (in my case the T-5 discriminator transformer). Did you find a source?

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