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 Post subject: ** Updated September 1 * Restoration Help - RCA R-93-C Phono
PostPosted: Aug Wed 18, 2021 9:35 pm 
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Joined: Dec Sun 29, 2013 8:09 pm
Posts: 217
Location: Portland, Oregon
Looking for someone to finish the restoration of my 1938 RCA Phono (see photo below).

I live in Portland, Oregon but am willing to pack and ship the small phono so the restoration can be completed.

These are basic record players that connect (via two screw terminals on the rear of the chassis) to 1936 or 1937 RCA radios allowing you to play 78 rpm records thru the radio (on any unused radio frequency).

Most of the restoration is complete:

- Cabinet is refinished.

- Platter motor works and the speed is correct.

- A P51-3 cartridge was purchased to replace the original Astatic 89T crystal cartridge.

The remaining restoration tasks are:

- Mount and install the replacement cartridge (it will take a bit of creativity to install it the right way.

- If necessary, offset the tonearm weight with a small spring or weight to match the recommended tracking weight for the replacement cartridge. (The tonearm on an RCA R-93C is much less than the heavy tonearms on the RCA R-93A phonos.)

- If possible reduce or eliminate a persistent thump of the platter (it is not super loud and you might not even hear it when a record is playing.

- It may need a few rubber parts where the wires go through the cabinet.

Thanks.


Attachments:
RCA R-93C Ad.jpeg
RCA R-93C Ad.jpeg [ 103.75 KiB | Viewed 786 times ]

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Last edited by patrick97214 on Sep Wed 01, 2021 11:16 pm, edited 3 times in total.
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 Post subject: Re: Restoration Help In Portland, OR – RCA R-93-C Phono
PostPosted: Aug Wed 18, 2021 10:11 pm 
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Joined: Jan Wed 16, 2013 12:04 am
Posts: 2578
Location: 77001
patrick97214 wrote:
The remaining restoration tasks are:

- Mount and install the replacement cartridge (it will take a bit of creativity to install it the right way.

- If possible reduce or eliminate a persistent thump of the platter (it is not super loud and you might not even hear it when a record is playing.

- It may need a few rubber parts where the wires go through the cabinet.Thanks.
Patrick,
RE: Thump. Most likely this is due to the rubber motor idler
wheel having a dent in it from sitting against
the speed turret on the motor.

You can remove the wheel and visually inspect it.
If that is the case, order a re-tired wheel from:

https://thevoiceofmusic.com/catalog/pho ... urrets.asp

Reference: https://www.radiomuseum.org/r/rca_phono_r93c.html

Good luck,
Hotwax


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 Post subject: Re: Restoration Help In Portland, OR – RCA R-93-C Phono
PostPosted: Aug Wed 18, 2021 11:28 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2664
Location: Haledon NJ USA
I believe this phono uses an induction disc motor, and does not have an idler wheel.


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 Post subject: Re: Restoration Help In Portland, OR – RCA R-93-C Phono
PostPosted: Aug Thu 19, 2021 8:54 pm 
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Joined: Nov Wed 27, 2013 5:59 am
Posts: 867
Location: Metzger Oregon
I could try to offer some help, but the reality is that I just don't have time to finish the things I need to get done, so other people's projects don't tend to make it to the top of the priority list.

That said, I suspect the first issue you are going to run into is reducing the tracking weight to a level that the new cartridge can handle. It looks like your tone arm is steel, correct? Is there any provision for a spring or counterweight? The only way I know to lighten the load on that type of arm is to either attach a clip on nut behind the pivot point and use a small bolt as a counter weight; Not pretty but it would at least do the job; or to try to add a mass behind the pivot point - solder works great for this, but it may take a lot to make a difference. Lastly you could get creative with a spring or custom machined counter weight, or just swap the arm for a newer one. I have lots of parts and pieces around if that's of any help, but I'm not sure I have an elegant solution to the tone arm weight.

The few restorers I know are pretty backed up right now unfortunately.


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 Post subject: Re: Restoration Help In Portland, OR – RCA R-93-C Phono
PostPosted: Aug Thu 26, 2021 1:50 am 
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Joined: Dec Sun 29, 2013 8:09 pm
Posts: 217
Location: Portland, Oregon
bump

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 Post subject: Re: ** Updated September 1 * Restoration Help - RCA R-93-C P
PostPosted: Sep Mon 06, 2021 2:25 pm 
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Joined: Dec Sun 29, 2013 8:09 pm
Posts: 217
Location: Portland, Oregon
bump

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