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 Post subject: Sentinel 6946 s
PostPosted: Apr Tue 06, 2021 11:14 pm 
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Joined: Sep Sat 06, 2008 6:17 pm
Posts: 1167
Location: Central Pa, 17044
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Hi Guy's

Well I finally gave in and went and picked up this
BASKET case 32V radio. The first 32v farm set for me.
Can I use 4, 9V battery's in series giving me 36vdc
on a 32V set?
I was going to use more 9 v battery's 16 in all.
Using 4 sets of 4 in a series/parallel arrangement, to
give me more current?
Also I'm going to have to totally rebuild the cabinet :oops:
I do have some wood working skills :?:
Here's the set.
Gary


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 Post subject: Re: Sentinel 6946 s
PostPosted: Apr Tue 06, 2021 11:42 pm 
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Joined: Nov Tue 14, 2017 5:09 am
Posts: 4006
Location: Austin, Texas
You can't afford to run that radio on 9V batteries. You need to look for a power supply with several amps of output current. If the radio has a vibrator, something with at least 10A of surge capability would be good to get it started. If the radio is 32V only, you can probably get by with a 5A supply. The tube filaments will draw a lot of current when cold so you need a supply that will not go over current on start up.

It appears to be the same chassis as the 6900: https://www.radiomuseum.org/r/sentinel_6900.html
There is no vibrator and you can probably get by with a 3A, 32V, power supply.

Jay


Last edited by JnTX on Apr Tue 06, 2021 11:50 pm, edited 1 time in total.

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 Post subject: Re: Sentinel 6946 s
PostPosted: Apr Tue 06, 2021 11:47 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 18221
Location: Mountains of Mourne. Ireland.
What does the nameplate under the center control knob say?

Looks like your gonna need a belt sander and a lot of Bondo. lol
:) Greg.


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 Post subject: Re: Sentinel 6946 s
PostPosted: Apr Wed 07, 2021 12:40 am 
Member

Joined: Sep Sat 06, 2008 6:17 pm
Posts: 1167
Location: Central Pa, 17044
It is a brass plated badge SENTINEL.
The other two say TONE and AM/SW
No the set has no vibrator.

Anyone have any idea's as to what wood material to
use, plywood? I mean for the substrate. I plan to buy new
vaneer if I can get the cabinet looking half
descent :)
Yes, If I can get the set to play, I will build a power supply.
I wish I had 1/4 the wood working skills as Fred Taylor has,
His work is genius :!:

Gary


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 Post subject: Re: Sentinel 6946 s
PostPosted: Apr Wed 07, 2021 1:53 am 
Member

Joined: Nov Tue 14, 2017 5:09 am
Posts: 4006
Location: Austin, Texas
I converted a similar radio to 120VAC. This is the schematic of the power supply:
Attachment:
32V Conversion.jpg
32V Conversion.jpg [ 67.62 KiB | Viewed 743 times ]

I used a power transformer similar to this one and it fit easily under the chassis:
https://www.ebay.com/itm/Avel-Y236103-3 ... 1587713800

Jay


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 Post subject: Re: Sentinel 6946 s
PostPosted: Apr Wed 07, 2021 12:52 pm 
Member

Joined: Sep Sat 06, 2008 6:17 pm
Posts: 1167
Location: Central Pa, 17044
Thanks Jay, That looks like just what I want to use :idea:

Gary


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