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My latest find - Motorola X15A

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Post by Greg Davis Mon Jul 04, 2016 8:01 pm

Found this at an antique mall in WI on my recent trip there. It was $22, but in super clean condition. Circa 1960... it's as old as I am.

My latest find - Motorola X15A DSCN9659

My latest find - Motorola X15A DSCN9660

My latest find - Motorola X15A DSCN9661
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Post by Bill Cahill Mon Jul 04, 2016 8:52 pm

It looks nice. It's been repaired. I think it was worth the price.........

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Post by 75X11 Tue Jul 05, 2016 8:31 am

That is an interesting model.  I didn't know Motorola marketed a pocket unit.  Their larger portables were of domestic production.  I guess the miniature discrete domestic production was reserved for 2 way and pager manufacture.  Good find.
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Post by Wildcat445 Tue Jul 05, 2016 1:32 pm

Greg, do you repair and restore transistor radios, or collect them, working or not?

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Post by Greg Davis Tue Jul 05, 2016 2:05 pm

More the latter. I can repair transistor circuits, but I never understood the circuits enough to diagnose problems that aren't blatantly obvious.
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Post by Wildcat445 Tue Jul 05, 2016 2:15 pm

I'm not sure I could do that well!

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Post by 75X11 Tue Jul 05, 2016 2:28 pm

They're not too bad actually, although I would prefer troubleshooting one with a signal generator and oscilliscope. The first 2 way radios and pagers I repaired weren't too much different in construction from your radio.
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Post by Wildcat445 Tue Jul 05, 2016 5:43 pm

I have a cute little Airline transistor radio I have had since I was a tadpole. It does not work anymore and I'd like to get it going one of these days. I know how to turn it on, adjust the volume, change the station and install batteries. Nothing else makes any sense to me. How about some SS instruction, 75?

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Post by 75X11 Tue Jul 05, 2016 6:09 pm

To be honest, The biggest and most difficult to obtain help, would to get a good equivalent of the perpetual troubleshooters library for getting good working drawings with the good test points. The older transistor units are laid out much like it's tube based counterparts. They are relatively easy to check and align with a good signal generator. I have always used and prefer to use a oscilliscope to perform my measurements. I can check levels but also check for any distortion that can indicate a problem in the circuit.

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Post by Wildcat445 Tue Jul 05, 2016 6:17 pm

I know transistor circuits are low voltage. I've heard that batteries in meters can damage transistors if you don't know what you are doing. Emitter, collector, base. I get their elements confused with their tube counterparts.

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Post by 75X11 Tue Jul 05, 2016 6:27 pm

The higher voltage batteries like the 22.5 volt in some VOM's can ruin a component. That's why I use the o scope for signal work and use proportionate resistance ranges with the meter. I always used an analog meter as they can show small cut outs and level changes a bit better than a digital.
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Post by Bill Cahill Tue Jul 05, 2016 6:33 pm

Warning Will Robinson!!!!!!!

The early transistors had higher leakage than the newer ones.
The earlier transistors are not interchangeable with the newer ones.

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Post by 75X11 Tue Jul 05, 2016 6:35 pm

I always recommend this book to anyone wanting to sharpen up on solid state electronics. It was originally published when the technology was still new. It is an excellent reference book as well. I have just about worn out my second copy. I bought my first in 1976.

https://www.amazon.com/Basic-Electronics-Dover-Books-Engineering/dp/0486210766/ref=sr_1_6?s=books&ie=UTF8&qid=1467757747&sr=1-6&keywords=basic+electronics
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