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This OGR thread might be related.  If your symptoms are similar there are 2 transistors that behave like the iconic "triac" used to control the AC track voltage.

mth 50-1013 lock on

The IRFZ34 is (was) a widely used part and is readily available.  Example from Amazon shown above.  Given USPS package postage rates start at about $5, while you obviously don't need 10 pieces, I'm not sure you'll find a much better deal shipped to your door.  Well, I did look on eBay and there are some U.S. sellers where you might save a buck or so...

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  • mth 50-1013 lock on

Since you'll have 10 pieces, I suggest you just replace both transistors.  Yes, we could go into troubleshooting mode using a meter to diagnose if it's just 1 of the 2 that failed or whatever, but why bother.

I just checked on eBay and it appears if you bide your time you can buy a 50-1013 working unit for around $30 (or less).  But bidding/buying on eBay is not for everyone.  I get that.

ir lockon

So if going the DIY route, when you get the parts, if it seems too daunting a task, I will replace them for you.  All I'd ask is you pay for shipping.  My understanding is this remote-control lockon is no longer available (at least the MTH site availability page suggests that).  So if this is what's stopping your from enjoying your trains at age 92 (wow!) I might be able to help...

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  • ir lockon
Last edited by stan2004
@stan2004 posted:
So if going the DIY route, when you get the parts, if it seems too daunting a task, I will replace them for you.  All I'd ask is you pay for shipping.  My understanding is this remote-control lockon is no longer available (at least the MTH site availability page suggests that).  So if this is what's stopping your from enjoying your trains at age 92 (wow!) I might be able to help...

Classy offer Stan.

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