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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 9th Nov 2018, 12:10 pm   #1
GMB
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Default Any info on 10.5V grid bias battery?

I can't seem to find any pictures of grid bias batteries of the 30's and 40's that at least offer up to 10.5V, with tappings.

I know what size the battery box is for one of them: 6" x 1" x 2.5" roughly.

Was there a 10.5V battery or would it have been bigger, just not using all of it?
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Old 9th Nov 2018, 12:15 pm   #2
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Default Re: Any info on 10.5V grid biad battery?

I thought the max was 9.5Volts?
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Last edited by Station X; 9th Nov 2018 at 12:34 pm. Reason: Thread moved.
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Old 9th Nov 2018, 12:58 pm   #3
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Default Re: Any info on 10.5V grid bias battery?

?? There is no maximum.
These are batteries made from 1.5V cells in series, as many as needed.

I know of grid bias up to 21V !

I was hoping to find out whether the 10.5V ones were actually bigger or exactly that size and ideally see a photo of one.
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Old 9th Nov 2018, 1:00 pm   #4
John M0GLN
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Default Re: Any info on 10.5V grid bias battery?

Looking in a 1930-31 'Northern Radio and Cycle Supplies' catalogue, there are listings for a few giving higher voltages than 9.5V, Grosvenor has a range up to 24V in 3V steps, Siemens up to 16.5V in 1.5V steps and Ever Ready and Pertrix 15V in 1.5V steps, unfortunately no pictures of the grid bias ones only the HT batteries.

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Old 9th Nov 2018, 1:03 pm   #5
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Default Re: Any info on 10.5V grid bias battery?

I don't know of a 10.5 volt (max) GB battery that was made, that said it would probably fit into a 6" slot:

http://www.royalsignals.org.uk/kd4hs...-front-ref.jpg

Lawrence.

Last edited by ms660; 9th Nov 2018 at 1:07 pm. Reason: re-write
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Old 9th Nov 2018, 1:09 pm   #6
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Default Re: Any info on 10.5V grid bias battery?

Yes, I saw that picture and deduced the same.

Grid bias batteries that provided at least 10.5V and were less than 6" long were most certainly made. I just don't know if they were 10.5V exactly (plus lower tappings) or bigger.
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Old 9th Nov 2018, 1:15 pm   #7
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Default Re: Any info on 10.5V grid bias battery?

Quote:
Originally Posted by GMB View Post
?? There is no maximum.
I was hoping to find out whether the 10.5V ones were actually bigger or exactly that size and ideally see a photo of one.
I can tell you the sizes of the ones I mentioned in my post but I cant find any 10.5V ones.,

Grosvenor 24V = 13-3/8" x 7/8" x 3"
Siemens 16.5V = 9-1/8" x 1" x 3-1/8"
Ever Ready 16V = 9-1/8" x 7/8" x 3-1/4"
Pertrix 15V = 8-1/4" x 15/16" x 2-15/16"

The Ever Ready is actually listed as 16V not 15V as I posted.

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Old 9th Nov 2018, 1:29 pm   #8
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Default Re: Any info on 10.5V grid bias battery?

Ten new 1.5V cells could easily add up to 16V.......
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Old 9th Nov 2018, 4:34 pm   #9
HamishBoxer
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Default Re: Any info on 10.5V grid bias battery?

I certainly stand corrected again this week,I really thought they never went above 9.5V and of course that is all I have ever seen till today's pictures.
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