Re: Valve equivalents - electrically
There were some intriguing notes on substitutions in the original volume of the 'Mullard Maintenance Manual' for certain obsolete types. Some were verging on 'desperate' and would state 'change base/xx resistor/heater volts' and the like ( sometimes more than one ! ) no doubt to keep a set going at any cost.
There was indeed a '12V6' as I have some RCA samples.
Andy
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