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 Post subject: Columbia model 518 (captured in the wild)
PostPosted: Apr Fri 30, 2021 10:32 am 
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Joined: Apr Fri 30, 2021 4:55 am
Posts: 3
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Found this time capsule on Marketplace yesterday for $5.
She’s got weak/intermittent rotation to the platter and a humming out of the speakers. I’ll be attempting a restoration over the next couple weeks. Any guidance to keep me from rookie mistakes is greatly appreciated.
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 Post subject: Re: Columbia model 518 (captured in the wild)
PostPosted: Apr Fri 30, 2021 3:55 pm 
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Joined: Jan Wed 16, 2013 12:04 am
Posts: 2617
Location: 77001
Welcome to the Phono forum.

That's a great buy for $5. With some parts investment
and restoration, it will sound very good.
Your model may have an electrostatic tweeter.

Attaching the schematic for you.

Also a thread from Ed, doing a Voice of Music
record changer restoration similar to yours.
Both are Voice of Music 1200 series changers.

viewtopic.php?f=9&t=186294&hilit=restoration+zenith

And 1200 video series by Chris Cuff (RIP): https://www.youtube.com/watch?v=RZffuxl9bB0


1.Electrolytic filter capacitors and selenium rectifier
to be replaced. Resistors checked.

Recommend replacing 50C5 output tubes with
new ones. The old tubes can cause hum due
to internal age problems after decades of use
and their high voltage filaments.

2.Tonearm appears to have a crystal turn-over cartridge.
It is probably defunct, and for replacement.

3.Old rubber idler wheel needs replacement.
See: thevoiceofmusic.com for any V-M parts.

4. Thorough cleaning of record changer mechanism.

Hotwax


Attachments:
Columbia 517-518.pdf [190.04 KiB]
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 Post subject: Re: Columbia model 518 (captured in the wild)
PostPosted: Apr Fri 30, 2021 4:05 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 19222
Location: Mountains of Mourne. Ireland.
Attached below is the service manual for the changer...
Sams Photofact Set-353 Folder-16

The amplifier is in Set-376 Folder-9
I don't have it!

------------

You will need to remove and replace all the hardened grease. All rubber parts may also need replacing due to age related deterioration.

For service literature, motor mounts and other rubber parts which have deteriorated with the passage of time, Gary Stork at thevoiceofmusic.com is a good guy to deal with→ http://thevoiceofmusic.com/

When disconnecting interconnecting cables, label them with masking tape flags or directly with a sharpie.
Example: tuner chassis terminal-A to amp chassis terminal-A
B to B etc.
otherwise you'll get lost when it comes to reassembly... :shock:

Take your time and work methodically... :)
For anyone disassembling a record changer for the first time, taking photos along the way can often get you out of a jam later on,
and, Watch out for the Dammit clips!

Buckle-up...
Here are a few (Chris Cuff) video links that will give you an insight into the world of record changers.
viewtopic.php?p=2521885#p2521885

------------

Lubrication→ viewtopic.php?p=3273985#p3273985

------------

Watch: servicing a double pole motor...
viewtopic.php?p=3361713#p3361713



Welcome aboard... :)
Greg.


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SAMS 353-16.pdf [11.15 MiB]
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 Post subject: Re: Columbia model 518 (captured in the wild)
PostPosted: May Sun 02, 2021 2:36 am 
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Joined: Apr Fri 30, 2021 4:55 am
Posts: 3
Hi Hotwax. Thanks for sharing your knowledge! I will act upon all of your recommendations without hesitation; I stopped being a “hardhead” many years... and even more rookie mistakes ago :lol:
Before authoring the initial post, I happened upon a recent post string in which you were helping another “noob” through troubleshooting procedures. So... I removed the Dammit clip off the spindle with a flathead screwdriver; covering it with a towel(simultaneously, blocking the field goal attempt).
I’ll pump the brakes now and get schooled with the files provides by yourself and Greg. I hope I’ll be able to reach out to you should I get lost. Meanwhile, here are some photos of what is under the platter and behind the interior grille fabric/mount. Thanks again for helping me.


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 Post subject: Re: Columbia model 518 (captured in the wild)
PostPosted: May Sun 02, 2021 2:53 am 
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Joined: Apr Fri 30, 2021 4:55 am
Posts: 3
Hi Greg.

Thanks so much for the videos and literature. Lord knows I need them! Also, thanks for the solid advice on keeping a photographic log so I don’t wind up with crossed connections and “extra” screws after reassembly is “complete”. :shock: I appreciate you taking the time to share your knowledge. :)


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 Post subject: Re: Columbia model 518 (captured in the wild)
PostPosted: May Mon 03, 2021 2:23 am 
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Joined: Feb Wed 04, 2015 12:26 am
Posts: 1691
Guys,

Is this one of those early "stereo compatible" models with a stereo cart, they run the one either the right or left side out to connect to another, seperate amp?


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 Post subject: Re: Columbia model 518 (captured in the wild)
PostPosted: May Mon 03, 2021 10:46 pm 
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Joined: Jan Wed 16, 2013 12:04 am
Posts: 2617
Location: 77001
Artcurus wrote:
Guys, Is this one of those early "stereo compatible" models with a stereo cart, they run the one either the right or left side out to connect to another, separate amp?

Artcurus,
No, there's no evidence for this being a transition player
to upgrade to stereo later.

1. The Sonotone 2-T is a mono cart.

2. No circuitry or wiring denoting stereo
capability add-on in schematic.

3. What I have seen is that a V-M 1201
Stere-O-Matic or similar changer have
been included in conversion record players.

These have a Mono/Stereo selector slide switch on them.
This, along with the proper wiring & stereo cart will
allow for a second amplified stereo
channel to be added on ( amplified speaker ).

Hotwax


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