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 Post subject: 1937 Sentinel Radio Question
PostPosted: Apr Thu 26, 2012 6:01 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 238
Location: Chesapeake, VA USA
I am getting ready to work on a circa 1937 Sentinel Model 52 table top radio that someone else has previously butchered. All the paper caps have been removed. Does anyone know what make/manufacture the original paper caps were used in 1930s Sentinel radios? Did they have their own branded caps, or use other generic caps like Sprauge? Also, this radio has a bias cell where prior restoror installed a watch battery. Is this a proper replacement for a bias cell?
Thanks,
Britt


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 Post subject: Re: 1937 Sentinel Radio Question
PostPosted: Apr Thu 26, 2012 7:01 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Raleigh NC USA
Last year I did a Sentinel 269T from the late 30's. It had blue-label Solar molded plastic caps.

If the watch battery matches the specified bias cell voltage, it should do, so long as it's properly installed for polarity.

Larry

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 Post subject: Re: 1937 Sentinel Radio Question
PostPosted: Apr Thu 26, 2012 10:29 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Chesapeake, VA USA
Thanks Larry, did these Solar caps look like the plastic bumble-bee style plastic caps?

Britt


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 Post subject: Re: 1937 Sentinel Radio Question
PostPosted: Apr Fri 27, 2012 8:35 am 
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NO, the Solar caps are a light brown, and the wrapper slips over them like a crayon wrapper.

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 Post subject: Re: 1937 Sentinel Radio Question
PostPosted: Apr Fri 27, 2012 12:14 pm 
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Location: Raleigh NC USA
Right, and the molded plastic bodies themselves often looked sloppy, as if somebody made them by hand instead of by machine.

L

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 Post subject: Re: 1937 Sentinel Radio Question
PostPosted: Apr Fri 27, 2012 5:42 pm 
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Location: Seattle
If the bias cell goes between grid and ground, you can likely replace it with a 10 Meg resistor and get rid of it entirely. If it's floating, though, you'll need to keep the battery there.


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 Post subject: Re: 1937 Sentinel Radio Question
PostPosted: Apr Fri 27, 2012 11:21 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 238
Location: Chesapeake, VA USA
Guys thanks for the info... I re-looked this chassis over and it also has three of the raised tube shield mounts riveted to the tube sockets where the tube shield fit over top in friction mount. Two of these are missing and have two square philco tube shields mounted with grounding strap wires soldered to ground. The more you look....the more you find...maybe I will put this one off awhile and pick a simpler project like my Zenith 8S443 table set.
Britt


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