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 Post subject: RCA AR-?? or CR-?? What is it that I've gotten myself into?
PostPosted: Apr Mon 15, 2019 12:05 am 
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Joined: Jan Fri 20, 2012 10:25 pm
Posts: 130
Location: Warminster, PA
Some more iron followed me home last weekend. It may be a CR-88 or CR-88A but you typically don't see them with the black panel.

Please follow this link to a bunch of pics https://www.thdesignsinc.com/Mystery_RCA.html

I've been in contact with Henry, WA7YBS, at radioblvd and he is a bit stumped also.

Any guesses? Note the black IF transformer tops and silver cans. The tops appear to be original and not something someone painted.

I'll also need a GOOD source for parts - need some dials and a couple other things.

This one is going to be a project.......

Tom

W3TA


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 12:11 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7847
Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
This looks to be an RCA AR88-D. I don't of anything in the AR88/CR91 series with an AM BCB bandswitch position except the AR88-D, but I am a long way from being an expert.

Here's a page that might help, (given the diversity control on yours) : https://www.radioblvd.com/ar88.htm


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 12:22 am 
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Joined: Jan Fri 20, 2012 10:25 pm
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Location: Warminster, PA
John Bartley wrote:
This looks to be an RCA AR88-D. I don't of anything in the AR88/CR91 series with an AM BCB bandswitch position except the AR88-D



My understanding (subject to being wrong.....) is that the "D's" were not a diversity receiver as this is.

My thought is it may be an AR-88F which was a diversity receiver or a CR-88A.

There are subtle differences between each model and this one but I have not been able to say for sure which it is.

Tom


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 1:45 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Seattle WA US
Tom-
I don't see the tell-tale pattern of four tapped screw holes on the front panel that would mark a military receiver with its nameplate missing.
I do see what looks like an RCA commercial nameplate on the removable RF Section cover. Could you get a better photo of that nameplate ??


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 1:53 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7847
Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
thoyer wrote:

My thought is it may be an AR-88F which was a diversity receiver or a CR-88A.




Having dug a bit deeper, I think you may be correct. I had only ever known of the AR88D as having a BC band option, but apparently the "F", diversity receiver also receives the BC band.


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 1:57 am 
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Joined: Jan Fri 20, 2012 10:25 pm
Posts: 130
Location: Warminster, PA
K7MCG wrote:
Tom-
I don't see the tell-tale pattern of four tapped screw holes on the front panel that would mark a military receiver with its nameplate missing.
I do see what looks like an RCA commercial nameplate on the removable RF Section cover. Could you get a better photo of that nameplate ??


Yes, there are no holes in the front panel - which by the way is in Excellent shape (after some cleaning....)

The nameplate you see on the main tuning cover is just the remnants of the name plate that WAS there at some point. Totally illegible - I tried to rear it even under magnification but it is just a ghost image that is not readable.....

Tom


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 2:03 am 
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Joined: Jan Fri 20, 2012 10:25 pm
Posts: 130
Location: Warminster, PA
John Bartley wrote:
thoyer wrote:

My thought is it may be an AR-88F which was a diversity receiver or a CR-88A.




Having dug a bit deeper, I think you may be correct. I had only ever known of the AR88D as having a BC band option, but apparently the "F", diversity receiver also receives the BC band.



But did the "F" have crystal phasing?


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 2:44 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3265
Location: Seattle WA US
Could you get some photos, or high resolution scans of the obliterated nameplate ? Sometimes photoshop can do surprising things to a photo.
-Chuck


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 3:00 am 
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Location: Montvale NJ, 07645
Wild guess, a CR-88A that got a black finish instead of gray....


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 2:43 pm 
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Joined: Jan Mon 28, 2013 9:35 pm
Posts: 1444
Location: Santa Rosa, CA
Is there anything on your radio that points to it being from Canada?
I've got a CR-91A that has very similar mods as yours. They were professionally
done with added silk screening on the panel but not RCA quality.
Have seen a few AR and CR receivers from Canada with these types
of mods (usually for diversity).

Before you spend a lot of time and money on this take a close
look at the band switch. Wish I had. It had seen very heavy use
and was so worn (deep grooves in the moving contacts) its
very intermittent and nearly impossible to repair.
Steve

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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 4:18 pm 
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[Small world. Turns out I owned that very CR-88A back in 2003 - 2004. It didn't look like that though. I sent the photos to Tom, not knowing it was the same receiver. It received that damage in storage when the roof leaked. :cry:[img]_1200[/img]

Here is a link to the remaining photos: https://1drv.ms/a/s!AqsLNQOu9T7vtx_nJWQdUN5Bvjl4


Attachments:
img_1200.jpg
img_1200.jpg [ 87.69 KiB | Viewed 470 times ]

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Gulfport, MS.
Dx'ing Since '57
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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 5:48 pm 
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Joined: Jan Fri 20, 2012 10:25 pm
Posts: 130
Location: Warminster, PA
Les Locklear wrote:
[Small world. Turns out I owned that very CR-88A back in 2003 - 2004. It didn't look like that though. I sent the photos to Tom, not knowing it was the same receiver. It received that damage in storage when the roof leaked. :cry:[img]_1200[/img]

Here is a link to the remaining photos: https://1drv.ms/a/s!AqsLNQOu9T7vtx_nJWQdUN5Bvjl4



Les, my goal is to get it looking that pretty again!

Tom


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 Post subject: Re: RCA AR-?? or CR-?? What is it that I've gotten myself in
PostPosted: Apr Mon 15, 2019 10:54 pm 
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Location: Montvale NJ, 07645
Scott wrote:
Wild guess, a CR-88A that got a black finish instead of gray....


Well, the "wild guess" was not too far off. It got a refinish in black along with the transformer covers.

Image

I would put film capacitors in those oil filled ones because they will eventually leak and you will be hauling it to the bench cursing sometime in the future if you don't do it now.

The chassis is cadmium plating over copper. Depending on how deep the rust pits are, you may want to think about having the whole thing replated. The copper is relatively cheap, not to sure about the cadmium and if there are many platers left doing cadmium.

I hooked up with a guy in FL who occasionally lists AR-88 parts on E-bay, and he says he has a lot. Not sure about dials and the stuff that tends to go fast, but he hooked me up with a couple of critical parts. I have his private email address and can give it to you if you PM me.

You would have had a heck of a lot less work with mine Tom, but I am now grateful I did not let it go and I will restore it.


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