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 Post subject: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Wed 28, 2019 9:12 pm 
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Joined: Aug Wed 28, 2019 8:53 pm
Posts: 7
So I picked up this console for free on the side of the road. The outside of it appeared in great condition. Got it home and plugged it in and of course there is no sound, but it does power on, the lights all work and the phonograph spins. It’s has a dial that lets you choose between turntable, AM radio, FM radio and something labeled MX. I left it plugged in for about 15 minutes and the back started to smoke a little bit. I know NOTHING about consoles or stereo repair, however I am very handy and confident I could perhaps try some basic repairs or troubleshooting with a little guidance.

Can anyone help me? Thanks in advance!


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Thu 29, 2019 1:13 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5455
Location: Rochester NY USA
MX is short for multiplex: stereo FM. Stereo broadcasts started in 1962, so it's later than that. Smoke is a VERY bad sign, there may be permanent damage. May not be a line fuse - though that won't always protect things either.

I did find this model in the Sams index, but I don't have it (1963: 677-11, tuner section and multiplex may be 667-2) can't help with a circuit diagram. There is a plug-in rectifier next to the big power transformer - if you unplug that and plug it in, it won't play with high voltage removed, but if the transformer heats up with that pulled, it's a goner. More likely is a shorted electrolytic capacitor (one of the big aluminum cans) or a leaky paper coupling cap (though this one is late enough that it may not have any paper caps).

_________________
My web page: https://bit.ly/2rxq4qx


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Thu 29, 2019 1:51 am 
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Joined: Aug Wed 28, 2019 8:53 pm
Posts: 7
Pulled out the rectifier and the unit is on and there’s no smoke or heat. All the little tubes underneath light up. That’s so cool. I’ve never seen the inside of an old system like this before.


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Thu 29, 2019 1:54 am 
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Joined: Jan Wed 16, 2013 12:04 am
Posts: 1641
Location: 77001
The damage needs to be assessed by a competent repair person.
You may have blown only a resistor, or have a bad capacitor, but recommend you do not
power up the stereo again, until it is serviced.

Primary service includes: all electrolytic and wax/paper or other
types of old capacitors replaced.
Resistors checked for failure/shorts, or out of tolerance limits.
Tubes checked for internal shorts and functionality.
Circuits' wiring reviewed for any insulation damage or broken wires.
Power and output transformers checked for shorts or other defects.

The record changer should be thoroughly cleaned, motor rebuilt/cleaned,
possibly new motor mounts and idler wheel.

Good luck,
Hotwax


Last edited by Hotwax on Aug Thu 29, 2019 1:57 am, edited 1 time in total.

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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Thu 29, 2019 1:55 am 
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Joined: Aug Wed 28, 2019 8:53 pm
Posts: 7
Also, before I pulled the rectifier like you said to, the unit made a loud-ish humming noise when powered on. Now, with rectifier our, unit is on, but totally silent and no heat or smoke.


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Thu 29, 2019 1:57 am 
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Joined: Aug Wed 28, 2019 8:53 pm
Posts: 7
I found this on the side of the road for free. I really don’t have any money to pour into it. I was willing to give it a shot myself because I was encouraged that it at least powered up.


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Thu 29, 2019 2:49 pm 
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Joined: Dec Sat 12, 2009 3:03 pm
Posts: 87
Location: VS Li
Emily,

With a quick strain of the neck, I can see it uses push/pull 6GK6 tubes (a 6BQ5 with a different pinout) for 15 to 20 watts per channel. Definately no slouch for volume when needed. I would absolutely try to get it sorted and operational. Capacitor replacement is a good starting point. Hopefully no damage was done. You don't mention where you are from, but no matter. This forum is a great resourse for information and help. A schematic is useful, but not really necessary, unless the unit was "serviced" previously. Otherwise, just open it up, create a list of capacitors to obtain, then replace them one at a time, and before long you will be enjoying it.

Do you own any test equipment, like a multimeter?

Tony


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Thu 29, 2019 2:57 pm 
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Joined: Aug Wed 28, 2019 8:53 pm
Posts: 7
Thanks for your reply. I’m in Northern California. Easy Bay Area. I’m almost certain this thing has never been serviced, when I opened it it still had the original advertisements that would have come with it when bought brand new. All the capacitors have the Setchell-Carlson name on them. I’m keen to fix her up and know a LITTLE about audio setup and repair but I know ZERO about capacitors or tubes or whatever the lingo is for these console chassis. Pretty sure I have a multimeter laying around here somewhere. Are there any MUST dos or dont’s I should know about? Also, can you recommend a place to find replacement capacitors? Also, if the capacitor is glowing with a soft amber/red light, does that mean it’s working and doesn’t need replacing. Thanks SOOO much for your help.


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Thu 29, 2019 10:59 pm 
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Joined: Feb Wed 04, 2015 12:26 am
Posts: 1020
Hello,

First, DO NOT power this up anymore. You are risking serious damage. Capacitors should not glow, what you are seeing is probably an overheating resistor. Again, I can't stress this enough. DO NOT power this up anymore.

Sal's Capacitors (ad on the right hand side of screen) is a good source for capacitors.

If you will look on the silver can, you'll see designations such as 30MFD at 350v. This is just an example but the format is the same. Make a list of the designations. These have definite + and -. The "-" is connected to the metal chassis. These are called Electrolytic capaoctors and Sal will need to know this.

Remove the amplifier from the cabinet and look at the parts under the amplifer. You will see small cylinders with designations such as .01 @ 350v. Again, these are just examples, yours might be slightly different but the format will be the same. Start a list of these parts.

Email Sal and send him the list that you made of the parts. Again, making sure that Sal knows which are electrolytics.


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Fri 30, 2019 12:35 am 
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Joined: Sep Mon 16, 2013 2:42 am
Posts: 3621
Location: Tucson, Arizona U.S.A.
Quote:
I’m in Northern California. Easy Bay Area.

WOW! Are you ever lucky! There is a major antique radio museum and club in Alameda. Someone from there might be willing to help you get this going.
https://www.californiahistoricalradio.com/
Some of the members post here so they might contact you before you can contact them.

And listen to the warnings: don't plug it in again until it is serviced.

Welcome to ARF and good luck,

_________________
Jim Mueller


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Fri 30, 2019 2:13 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4290
Location: Boston, MA USA
I think you may be confusing capacitors with tubes. It is normal for the tubes to glow orange. If capacitors are glowing, that's another matter! It is much easier to replace tubes than capacitors (they just plug in) but in an old set it's much more likely for the capacitors to be the problem.

-David


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Fri 30, 2019 2:17 am 
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Joined: Aug Wed 28, 2019 8:53 pm
Posts: 7
I’d send a picture of it turned on but now I’m afraid to plug her in based on what every said. I may be confusing terms. The things on the board that look like lightbulbs and are clear glass, those are the ones that glow. None of the other things are glowing. I reached out to the radio group in Alameda. Thanks for the tip.


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Fri 30, 2019 4:30 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 4290
Location: Boston, MA USA
Those glass light-bulb-looking things are the tubes, technically vacuum tubes. There are capacitors under the chassis and two or three in the silver cylinder on top of the chassis. If you can remove the chassis and send clear photos topside and underneath, we can tell you which ones will need to be replaced.

-David


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 Post subject: Re: Setchell-Carlson stereo amplifier RP630
PostPosted: Aug Fri 30, 2019 4:34 am 
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Joined: Aug Wed 28, 2019 8:53 pm
Posts: 7
Ok. Will do. Tomorrow I’ll remove the chassis and send detailed pictures so y’all can help me. I can’t tell you how much I appreciate all the help and input.


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