What is this part?

Gotta watch those Fresnel zones!
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lewiscallaway
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What is this part?

Post by lewiscallaway » Fri Jun 24, 2016 9:47 pm

I'm repairing a Mc Martin RPU receiver and I need to get a replacement for the part that is circled. For the life of me I can't remember what this part is called. If you guys could identify it that would be awesome!
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Shane
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Re: What is this part?

Post by Shane » Fri Jun 24, 2016 9:54 pm

The designation on the circuit board, T2, would suggest it is a tunable I.F. transformer. Adjustable because has a tuning slug visible up top.
Mike Shane, CBRE
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lewiscallaway
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Re: What is this part?

Post by lewiscallaway » Sat Jun 25, 2016 7:11 am

Thanks! Now where could I get a new one? I checked digikey but I didn't get any results...

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Bill DeFelice
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Re: What is this part?

Post by Bill DeFelice » Sat Jun 25, 2016 8:44 am

I know Charlie Goodrich of Goodrich Enterprises has been servicing McMartin gear longer than some people have been alive, I don't know if he's still doing so. If so, there's a good chance he can help you out.

Edited for clarity.
Last edited by Bill DeFelice on Sat Jun 25, 2016 6:26 pm, edited 1 time in total.
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Shane
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Re: What is this part?

Post by Shane » Sat Jun 25, 2016 2:14 pm

Does Mouser deal in these things? After Charlie i'd look at all the various parts houses.
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kcbooboo
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Re: What is this part?

Post by kcbooboo » Sun Jun 26, 2016 7:05 am

Kind of an odd part to go bad. There usually isn't much current flowing in an IF transformer. Solder connections do go bad, and the wires that connect to the terminals can break or form poor connections if the insulation wasn't thoroughly removed. I'd look elsewhere and rule out everything else before condemning that transformer. However, if the driving transistor shorted it could have burnt out the transformer winding.

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Re: What is this part?

Post by TPT » Sun Jun 26, 2016 8:24 am

Too much tweaking over the years, and the tuning slug won't stay in place.

kcbooboo
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Re: What is this part?

Post by kcbooboo » Sun Jun 26, 2016 12:34 pm

A little bit of candle wax should help, or wrap the slug with some Teflon plumbing tape.

I'm also thinking that coil probably should only be adjusted perhaps twice in its entire lifetime.

Bob M.

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Dale H. Cook
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Re: What is this part?

Post by Dale H. Cook » Mon Jun 27, 2016 6:00 am

kcbooboo wrote:I'm also thinking that coil probably should only be adjusted perhaps twice in its entire lifetime.
It may have encountered someone with a golden screwdriver.
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PID_Stop
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Re: What is this part?

Post by PID_Stop » Wed Aug 24, 2016 10:12 am

Dale H. Cook wrote:
kcbooboo wrote:I'm also thinking that coil probably should only be adjusted perhaps twice in its entire lifetime.
It may have encountered someone with a golden screwdriver.
A golden screwdriver with a magnetic tip.

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