UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits

Notices

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.

Closed Thread
 
Thread Tools
Old 9th Nov 2018, 12:10 pm   #1
GMB
Dekatron
 
GMB's Avatar
 
Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 3,086
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?
GMB is offline  
Old 9th Nov 2018, 12:15 pm   #2
HamishBoxer
Dekatron
 
HamishBoxer's Avatar
 
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,923
Default Re: Any info on 10.5V grid biad battery?

I thought the max was 9.5Volts?
__________________
G8JET BVWS Archivist and Member V.M.A.R.S

Last edited by Station X; 9th Nov 2018 at 12:34 pm. Reason: Thread moved.
HamishBoxer is offline  
Old 9th Nov 2018, 12:58 pm   #3
GMB
Dekatron
 
GMB's Avatar
 
Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 3,086
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.
GMB is offline  
Old 9th Nov 2018, 1:00 pm   #4
John M0GLN
Octode
 
John M0GLN's Avatar
 
Join Date: Jan 2004
Location: Southport, Merseyside, UK.
Posts: 1,156
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.

John
John M0GLN is offline  
Old 9th Nov 2018, 1:03 pm   #5
ms660
Dekatron
 
ms660's Avatar
 
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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
ms660 is offline  
Old 9th Nov 2018, 1:09 pm   #6
GMB
Dekatron
 
GMB's Avatar
 
Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 3,086
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.
GMB is offline  
Old 9th Nov 2018, 1:15 pm   #7
John M0GLN
Octode
 
John M0GLN's Avatar
 
Join Date: Jan 2004
Location: Southport, Merseyside, UK.
Posts: 1,156
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.

John
John M0GLN is offline  
Old 9th Nov 2018, 1:29 pm   #8
Herald1360
Dekatron
 
Herald1360's Avatar
 
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,528
Default Re: Any info on 10.5V grid bias battery?

Ten new 1.5V cells could easily add up to 16V.......
__________________
....__________
....|____||__|__\_____
.=.| _---\__|__|_---_|.
.........O..Chris....O
Herald1360 is offline  
Old 9th Nov 2018, 4:34 pm   #9
HamishBoxer
Dekatron
 
HamishBoxer's Avatar
 
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,923
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.
__________________
G8JET BVWS Archivist and Member V.M.A.R.S
HamishBoxer is offline  
Old 21st Nov 2018, 1:29 pm   #10
Paul_RK
Dekatron
 
Paul_RK's Avatar
 
Join Date: Nov 2003
Location: Fakenham, Norfolk, UK.
Posts: 4,246
Default Re: Any info on 10.5V grid bias battery?

I remembered this thread when I met this fellow today, still clipped inside an Osram 4 New Music Magnet.

Paul
Attached Thumbnails
Click image for larger version

Name:	exidegb.jpg
Views:	122
Size:	48.4 KB
ID:	173196  
Paul_RK is online now  
Old 21st Nov 2018, 1:51 pm   #11
HamishBoxer
Dekatron
 
HamishBoxer's Avatar
 
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,923
Default Re: Any info on 10.5V grid bias battery?

Possibly still got a bit of voltage too left.
__________________
G8JET BVWS Archivist and Member V.M.A.R.S
HamishBoxer is offline  
Old 21st Nov 2018, 2:25 pm   #12
Paul_RK
Dekatron
 
Paul_RK's Avatar
 
Join Date: Nov 2003
Location: Fakenham, Norfolk, UK.
Posts: 4,246
Default Re: Any info on 10.5V grid bias battery?

10 volts end to end, slowly dropping, when measured by my trusty Fluke 8000A (10M input impedance).
Paul_RK is online now  
Old 21st Nov 2018, 10:21 pm   #13
MotorBikeLes
Nonode
 
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,346
Default Re: Any info on 10.5V grid bias battery?

Well, that one must be old enough to be zinc cased and pitch topped off. So, stick it in the bottom oven by the fire (upright of course) and watch the voltage come up. Always did that with the mandatory Christmas torch off one of the aunties. Going back 70 years though.
Les.
MotorBikeLes is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 3:12 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.