Silvertone 9250A Restoration

[mcaddie7]

I typically restore higher end audio but found this Silvertone upper section for $7 and couldn’t resist.

It’s all in great shape, so was thinking of oiling up the mahogany cabinet, and quickly rewiring the tonearm and throwing in a cheap Stanton 500.

Does anyone have any info / thoughts on the turntable and on the amp?

I want to upgrade the amp outputs but am unsure one first glance if it’s mono or stereo? There is a speaker output and aux speaker output I’m going to quickly convert over to a normal wire jack, but is it left and right or two monos?

I’m assuming the turntable plugs into the two input jacks on the right side?

And finally, unsure what that top left RCA jack is for. Any info on this is greatly appreciated.

It won’t be a huge restore, just replace caps and power cord to make it safe, and a quick line and calibration of the turntable (I assume it’s idler)

 

[mcaddie7]

Amp tag

 

[Dswankey]

..Does anyone have any info / thoughts on the turntable and on the amp?

I want to upgrade the amp outputs but am unsure one first glance if it’s mono or stereo?

Per this thread (post #10), the poster says Mono

tube console help: Silvertone Medalist 9250A

Does anyone have any info on a Silvertone Medalist 9250A? Specifically, would this be a good candidate for an amp pull to turn into a standalone unit? I am assuming it is mono? It looks too clean to pull apart, though. Any help would be appreciated.

audiokarma.org

Not sure what the "A" denotes but this should probably be the same

Silvertone 9250 Ch= 528.59180 R-Player Sears, Roebuck & Co. |Radiomuseum.org

Silvertone 9250 Ch= 528.59180 Order=57Y M9250 R-Player Sears, Roebuck & Co.; Chicago IL, build 1959 ?, 4 pictures, 4 schematics, 5 tubes, United States of

www.radiomuseum.org

 

[mcaddie7]

Thanks! I saw these earlier but the posts seem to be divided whether this is stereo or mono. I’ll post the schematic later when I’m home, I’m sure that will be telling.

 

[gadget73]

Pretty unlikely this will handle a mag phono cartridge without a preamp.

from what I can see of the schematic in the one pic I'm thinking mono but its hard to say for sure. The two piece setup with an external amplified speaker to make stereo was not an uncommon config at this time, and that would also jive with it being a mono amplifier.

 

[mcaddie7]

Pretty unlikely this will handle a mag phono cartridge without a preamp.

from what I can see of the schematic in the one pic I'm thinking mono but its hard to say for sure. The two piece setup with an external amplified speaker to make stereo was not an uncommon config at this time, and that would also jive with it being a mono amplifier.

Oh this is new to me, I’d love to learn a little more. We’re ceramic carts originally made so that they only needed an amp to transmit sound and not need a pre amp?

When you say this setup was not uncommon, was it just a mono source put into two separate speakers? In that case is it really stereo or more of mono going through two speakers?

Thanks for any info, always love to learn

 

[gadget73]

Yep, output somewhere in the 500mv range, and they work into a high impedance input, often 1-5 megohoms. With very basic resistor or maybe resistor + cap loading they do a pretty good job of equalizing themselves to come out with normal frequency response. A magnetic cartridge is something like 5mv, or about 1/100 the output level of a ceramic. You can usually just stick a phono preamp between a mag cart and a ceramic input and have it work normally so this isn't a deal breaker.

Ceramics were pretty much standard on most consoles through the late 60s at least, only the high end stuff had magnetic cartridges. They weren't even particularly uncommon into the 1970s on lesser gear.


The two cabinet deal would have been real stereo, but the only stereo source back then was the turntable. If its got a tuner you get mono through both speakers. I have a Hoffman console from 1958 in this config, and I have pieces of a Magnavox from about the same time that was also that setup.

 

[mcaddie7]

Yep, output somewhere in the 500mv range, and they work into a high impedance input, often 1-5 megohoms. With very basic resistor or maybe resistor + cap loading they do a pretty good job of equalizing themselves to come out with normal frequency response. A magnetic cartridge is something like 5mv, or about 1/100 the output level of a ceramic. You can usually just stick a phono preamp between a mag cart and a ceramic input and have it work normally so this isn't a deal breaker.

Ceramics were pretty much standard on most consoles through the late 60s at least, only the high end stuff had magnetic cartridges. They weren't even particularly uncommon into the 1970s on lesser gear.


The two cabinet deal would have been real stereo, but the only stereo source back then was the turntable. If its got a tuner you get mono through both speakers. I have a Hoffman console from 1958 in this config, and I have pieces of a Magnavox from about the same time that was also that setup.

I’ve attached the schematics that are visible without removing the amp. Looks like it may have a pre amp but no RIAA curve? Either way with the tube topology I think this is mono right?

 

[Dswankey]

I'm guessing Mono too, as it looks like there is only 1 OPT

 

[gadget73]

yeah, mono, EL84 push-pull. Preamp just looks like a line stage with tone controls. Pretty much what I'd have expected.

 

[Dswankey]

@mcaddie7

For just general info on advertisement click on page 850 and then go forward

1959 Sears Spring Summer Catalog, Page 851 - Catalogs & Wishbooks

1959 Sears Spring Summer Catalog, Page 851

christmas.musetechnical.com