United Motors Delco 1107, elctrolytic

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United Motors Delco 1107, elctrolytic

Post by Ben Delk on Sun Jun 03, 2012 9:45 am

So just when you thing you have learned how to do something, you spend the next 10 hour trying to figure out where you went wrong. United Motors Delco 1107. Recapping was pretty straight forward but then can the multi-section aluminum can. This being a smaller chassis I thought I’d try cutting open the can, remove the insides and put the new electrolytic inside and close up the can. The schematic shows 3 section (red+) 8mfd, ( yellow+) 8mfd, (can-) 8mfd. Does this mean there were 3 caps to this electrolytic or 2 caps and the can is – or ground. The bottom or underside of the chassis end of the can has 3 connection points. I called myself making detailed notes and took pictures. Obviously I’m missing something because I get no sound. The speaker tests good, I checked all the tube on a tester and they all light up when in the chassis. I can connect my signal tracer to the tuner and hear a radio station.
Can anyone explain to me how this should be connected? I’m at the point where I can’t see the forest for the trees. If not, know anyone I can send it to so they can complete it? Somedays this hobby is fun, somedays, not so much>>>>>>>>>>>>>>


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Re: United Motors Delco 1107, elctrolytic

Post by Bill Cahill on Sun Jun 03, 2012 6:56 pm

May not be that. May be open resistors, or, bad mica caps.
Sounds like a two filter can to me. Were there wires? If so, how manny, what colors?
Bill Cahill

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Re: United Motors Delco 1107, elctrolytic

Post by Ben Delk on Mon Jun 04, 2012 8:11 am

No wires in the can just gause, tar and thin foil strips. There's no insulator around the bottom edge of the can or underneath so the can is the ground. In this case I fed a wire from the neg. end of the caps back thru the bottom of the can to a chassis ground. I replaced suspect resistors that were out of tolerance. I will admit 2 things here, one my frustation level is in the red zone and two, there is alot about these old radios I don't quite understand but I'm still waiting for the light to come on.
Ok, I'll put the caps back in the the way I had them and start with a different approach and see if I get a different result. Admitting ones faults is suppose to help clear the path to enlightment.
I know ...."patience grasshopper".

Blessings and many thanks,
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Re: United Motors Delco 1107, elctrolytic

Post by Ben Delk on Tue Jun 05, 2012 7:54 am

Here's the schematic on the 1107, does it not appear to have 3 electrolytics in that can?
http://www.nostalgiaair.org/PagesByModel/373/M0022373.pdf

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Re: United Motors Delco 1107, elctrolytic

Post by Bill Cahill on Tue Jun 05, 2012 10:28 am

O.K. I've figured it out.... Thanks for schematic.
This radio has what is called a stacked power supply for doubling voltage capacity of filters.
Also, chassis is in B+ supply. Not B-.
There are 3 filters. ANegative goes to B- with center tap of power trans.
A+ goes to low end of first resistor, and, - end of B.
+ end of B goes to chassis, and, - end of C.+ End of C goes to junction of two resistors in center.The other end of second resistor goes to chassis.
That's how they get their three sets of voltages for the set.
Bill Cahill

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Re: United Motors Delco 1107, elctrolytic

Post by Ben Delk on Tue Jun 05, 2012 2:00 pm

Ok, at least I'm not blind. Grasshopper appreciates the master.
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Re: United Motors Delco 1107, elctrolytic

Post by Bill Cahill on Tue Jun 05, 2012 7:08 pm

[b]I try to help. Hope it helped. Was it wired incorrectly?
Maybe one of the resistors is open?
Or, another one?
Or, bad micas?
Bill Cahill

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Re: United Motors Delco 1107, elctrolytic

Post by Ben Delk on Tue Jun 05, 2012 7:53 pm

Bill.....................YOU ARE MY HERO!!!!!!!!!!!!!!!
It took be a few minutes for whatr you were telling me to do to filter its way past my senior citizen mental lapse but the info finaly made sence when I drew it out on the schematic, step by step. I have all the caps temporaryly tacked in place and it works like a charm. Now maybe I can retain those brain cells long enough to see if I can put the caps back in the can and seal it up. Once again you have come to the rescue.....what a man...... Do be very honest with you had already spoken with someone about completing the fix and getting ready to box it up and ship it out when I got your reply. Prefect timing.....Thanks again.
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Re: United Motors Delco 1107, elctrolytic

Post by Ben Delk on Tue Jun 05, 2012 8:34 pm

Sorry....so excited I did not answer your questions.
Caps ok just not wired incorrectly and only had 2, needed 3.
Mica ok, resistors ok.
Installer....ok now just has much to learn.
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Re: United Motors Delco 1107, elctrolytic

Post by Bill Cahill on Wed Jun 06, 2012 2:12 am

That's how we all learn. Through mistakes, and, asking others more knowledgeable.. I'm always happy to help. Glad it worked out. Let us see pictures of your work when finnished.
Bill Cahill Very Happy

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Re: United Motors Delco 1107, elctrolytic

Post by Ben Delk on Wed Jun 06, 2012 10:54 am

Will do.....this radio, other than chassis rebild issue, was a cherry pick. The cabinet is almost flawless and just needs dusting.

thanks again.
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Re: United Motors Delco 1107, elctrolytic

Post by Ben Delk on Thu Jun 07, 2012 8:52 pm

The Delco 1107 is finished and ready for a prominent spot in the house. Many thanks to Bill for his guidance and patience. I picked this radio up at and auction for $100 and I have roughly $15 in parts. I did reaplace all the caps and out of spec resistors. The electrolytic can had 3 caps in it but I only but 2 back in the can and the third underneath because of its close proximity to its connects, just made sence. All I needed to do to the outside is a light wipe down, apply one coat of Watco rejeuvinater, buff it and "bam" it's done. See the pix below.

http://www.servimg.com/image_preview.php?i=12&u=17421296
http://www.servimg.com/image_preview.php?i=13&u=17421296
http://www.servimg.com/image_preview.php?i=14&u=17421296
http://www.servimg.com/image_preview.php?i=15&u=17421296
http://www.servimg.com/image_preview.php?i=16&u=17421296
http://www.servimg.com/image_preview.php?i=17&u=17421296
http://www.servimg.com/image_preview.php?i=18&u=17421296
http://www.servimg.com/image_preview.php?i=19&u=17421296
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Re: United Motors Delco 1107, elctrolytic

Post by Tony V on Thu Jun 07, 2012 8:58 pm

Beautiful radio and neat and tidy restoration. You did a nice job on this one Ben!
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Re: United Motors Delco 1107, elctrolytic

Post by Bill Cahill on Fri Jun 08, 2012 7:31 am

Indeed. Very fine job... Looks beautiful!!
Congradulations on a very fine job....
Bill Cahill

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Re: United Motors Delco 1107, elctrolytic

Post by Ben Delk on Fri Jun 08, 2012 7:50 am

Thanks guys..............
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