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 Post subject: Re: GE P-1810A project...
PostPosted: Feb Fri 17, 2017 4:17 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4528
Location: Indianapolis, IN
Hey Marty---that's great ! Thanks VERY much for looking !

Will e-mail you tonight... Am PM'ing now...

Thanks again !!!

John


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 Post subject: Re: GE P-1810A project...
PostPosted: Feb Wed 22, 2017 2:30 am 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4528
Location: Indianapolis, IN
Bought the oscillator coil and tuning knob from Marty's parts set and it arrived today !

Installed coil and with slight adjustment radio seemed to work well, but not what I expected. Just happened to touch an area of PCB bottom near RF amp and signal level increased dramatically---puzzled by this, touched components in area on topside and heard some scratching, then same result ! Turned out that the RF transistor emitter resistor had a bad solder connection from factory---wiggling it would cause level to fall & rise greatly... The lead pulled right out of solder-filled plated through hole and appeared to have a thin coating of dried flux on it---probably has never worked correctly since new !

Thanks again, Marty !

More to come...

John


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 Post subject: Re: GE P-1810A project...
PostPosted: Feb Fri 24, 2017 1:44 am 
Member

Joined: Nov Mon 26, 2012 1:21 am
Posts: 60
Glad I could help.
-Marty


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 Post subject: Re: GE P-1810A project...
PostPosted: Feb Sat 25, 2017 4:05 am 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4528
Location: Indianapolis, IN
Hello All,

Finally completed this set today !

Since it had been wiggled so much during troubleshooting, replaced the 1K RF amp transistor emitter resistor which wasn't properly soldered from factory with a new 1/4W carbon-film part. The adjusting screw to movable element solder joint on the ceramic RF trimcap (all trimmers separate with this tuning cap) came loose while tweaking and had to be resoldered. After verifying operation with test leads to speaker, reassembled into case and tweaked once again for maximum performance.

Since most of the chrome was worn off of the new tuning knob (which has a good bright), used stubby (cut down bristles) toothbrush with Novus-2 to remove the remainder and polish the grooves.

Radio is an excellent performer on the upper end of band and has very good sound for it's size with plenty of usable volume. The sensitivity at lower end of band isn't as good, but that's a problem for another day (when I get a good signal generator)...

Below are the final project pics...

John


Attachments:
1ARF 1810 PCB BOT DONE.jpg
1ARF 1810 PCB BOT DONE.jpg [ 211.65 KiB | Viewed 144 times ]
2ARF 1810 PCB TOP DONE.jpg
2ARF 1810 PCB TOP DONE.jpg [ 215.57 KiB | Viewed 144 times ]
3ARF 1810 PCB POLYVARI.jpg
3ARF 1810 PCB POLYVARI.jpg [ 198.62 KiB | Viewed 144 times ]
4ARF 1810 CMPLT INS.jpg
4ARF 1810 CMPLT INS.jpg [ 209.62 KiB | Viewed 144 times ]
5ARF 1810 CMPLT BK.jpg
5ARF 1810 CMPLT BK.jpg [ 202.65 KiB | Viewed 144 times ]
6ARF 1810 CMPLT FRT LFT.jpg
6ARF 1810 CMPLT FRT LFT.jpg [ 229.35 KiB | Viewed 144 times ]
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