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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Fri 26, 2018 6:34 am 
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Location: Waxahachie Texas
Notimetolooz wrote:
Nice work spotting those C26, C35 gimmicks!
I don't think I've ever seen any like that.


First time I saw something like that too.

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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Fri 26, 2018 6:35 am 
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Location: Waxahachie Texas
philsoldradios wrote:
Eric H wrote:
There are some tubes that have phosphors in the neck that glow to help adjust the trap, I think Phil Nelson has one? I remember it being green but I guess it could be purple also.
My Hoffman 7M112 TV had a Rauland CRT with a patch of green phosphor in the neck to aid in adjusting the ion trap magnet:

https://antiqueradio.org/Hoffman7M112Te ... #GreenGlow

Those are the biggest gimmick capacitors I've ever seen. I'd leave 'em alone -- they are just wires -- and avoid bending them into new shapes.

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html

Image


I'm not messing with them, that's for sure.

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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Fri 26, 2018 6:35 am 
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Location: Waxahachie Texas
I forgot to post this picture of the chassis with everything labeled.


Attachments:
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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Fri 26, 2018 6:36 am 
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Location: Waxahachie Texas
Started working on replacing the E-Caps tonight. I won't go into detail on how I make them up. BTW, these E-Caps all have cardboard covers so I left about 1/4 of the "donor" can to help align the PVC sleeve. Then the original can will be trimmed in length for the cardboard cover.

I want to get new E-Caps in so I could power it up and see where I am.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Fri 26, 2018 10:50 pm 
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Location: Waxahachie Texas
I finished re-stuffing the E-Caps. Then I installed them.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Fri 26, 2018 10:52 pm 
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After carefully checking my work and a good look see. I powered it up. First without the LV rectifier tubes, then with them but no H. Osc tube. All went well. Then all the tubes and my test CRT.

I got a raster and clear but faint sound. I tried twiddling all the controls but I couldn't get the horizontal to lock.

Then I installed the CRT that came with the set. Works great! A little too much light in my shop to really check for that purple glow. I'll do that tonight.

I switched over to FM, then screen went blank but I couldn't get any signals.

Overall I'm happy so far. BTW, the sound was very quiet. No hum or hash.

Later on after I check the CRT again, I'll start on the recap.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Sat 27, 2018 6:57 am 
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Crist Rigotti wrote:
I forgot to post this picture of the chassis with everything labeled.

Not quite everything is labeled. There is no label on the chassis saying chassis! :)

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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Sat 27, 2018 9:48 pm 
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This is a DuMont clone chassis. One of the things that has fascinated me about DuMont is that they seemed to enjoy symmetry transformations. This chassis is very similar to an RA-103, but with the CRT on the right and the tuner on the left.

Even more fascinating is that they used Inductuners both with CW rotation and CCW rotation, on the same model. Different dial scales and gearing for the two...

This had to be a lot of extra work for what would appear to be no benefit. Wonder what the motivation was?

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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Sat 27, 2018 11:44 pm 
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Tom Albrecht wrote:
This is a DuMont clone chassis. One of the things that has fascinated me about DuMont is that they seemed to enjoy symmetry transformations. This chassis is very similar to an RA-103, but with the CRT on the right and the tuner on the left.

Even more fascinating is that they used Inductuners both with CW rotation and CCW rotation, on the same model. Different dial scales and gearing for the two...

This had to be a lot of extra work for what would appear to be no benefit. Wonder what the motivation was?


I wonder if there was a tug of war between left- and right-handed engineers in the design department!

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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Sun 28, 2018 12:32 am 
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Location: Waxahachie Texas
After turning the chassis over to start recapping, I found this on my bench top. Wax drippings from a capacitor! A quick visual showed which one started dripping. It was C81. 1 of the Damper filter caps. L29 is the H. Linearity Coils.
Looks like I was pushing the limits when I powered it up.

Here are the before and after pictures along with the schematic.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Sun 28, 2018 2:31 am 
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aj2x wrote:
I wonder if there was a tug of war between left- and right-handed engineers in the design department!

Yeah, arm wrestling wasn't working!

.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Sun 28, 2018 10:59 pm 
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Location: Waxahachie Texas
I have a question about a cap that is used in this TV. It is C63 and it is listed as a .00025uf 600V cap. The one in the chassis is indeed a .00025uf 600 paper cap. It is used as a Sync Coupling cap. Can I use a 250pf 500V mica cap instead? I can't find this value anywhere in a film capacitor. I've included the area of the schematic that it is used. I would think a mica cap would be better than using a ceramic disc cap.....right?


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Sun 28, 2018 11:47 pm 
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Yes, a mica cap is a good choice there. I routinely replace these kinds of small value paper caps with mica. 500 V rating looks sufficient at this point in the circuit.

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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Mon 29, 2018 12:12 am 
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Tom Albrecht wrote:
Yes, a mica cap is a good choice there. I routinely replace these kinds of small value paper caps with mica. 500 V rating looks sufficient at this point in the circuit.

Great! Thanks Tom.

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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Mon 29, 2018 7:49 am 
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OK, finished the Horizontal section tonight. Tomorrow I'll power it up and check my progress.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Jan Wed 31, 2018 6:52 pm 
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Finished the vertical section yesterday.
When I powered it up I still got good audio but still no video. I then tried direct video injection and after turning the H. Freq. adjustment I got a picture. Things are looking up.

I think I'll do the Video Amp section then roll onto the Audio next.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Feb Thu 01, 2018 5:32 am 
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Completed some of the power supply section and the video amp section. The picture below is direct video injection to the video amp tube. Getting better.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Feb Fri 02, 2018 5:53 am 
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Completed the audio section today.
Tomorrow I think I'll do a little troubleshooting as to why I'm not getting any picture when running the signal through the IF section. Picture works great with video injection.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Feb Tue 06, 2018 2:01 am 
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Location: Waxahachie Texas
I need a little clarification on the alignment instructions.
I don't really understand what or how to hook up my test equipment. Maybe I'm a little tired.
The Sams instructions are below. What I don't quite understand is how do I continue to use my Eico 369 sweep generator to produce the 21.9MC signal and my demod cable? IT seemed to work for steps 6 and 7. But when I move the RF out cable and the Demod cable as in step 8, I still get the same waveform as in fig 3 and not fig. 4.


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 Post subject: Re: Crosley 9-403M Restoration
PostPosted: Feb Tue 06, 2018 2:17 am 
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Before you go to all that trouble, what's the AGC voltage? Your IFs might be cut off.


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