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Old 26th Nov 2018, 6:01 pm   #25
Orakle42
Pentode
 
Join Date: Nov 2015
Location: Maidstone, Kent, UK.
Posts: 131
Default Re: Wireless Set 19 repairs question.

Hi David

My records show that starting I at 12.6v DC for the A set only was 8 to 10 amps with a 0.01 series resistor. It settled after about 10 seconds at a nominal 1.9 - 2.0 amps. This coincides with the theoretical figure of 1.8 anps. If the IC valves are still present this would be slightly higher. I do not have a Mk3 circuit diagram but I assume it will be similar with 2 x 0.3 amp heaters in series. I opted for overkill on the diodes on a previous rectifier situation hence my suggestion for the 10a10 series which have a 6 amp
forward rating. The lower rated 1N54** series at 3 amps might suffice but you would have to check the surge current rating and the steady state power derating.

Hope this helps.

Orakle42
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