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
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