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Old 26th Apr 2019, 1:50 pm   #14
Orakle42
Pentode
 
Join Date: Nov 2015
Location: Maidstone, Kent, UK.
Posts: 131
Default Re: Rectifier

Am I missing something here? If you are replacing one semiconductor bridge with another why should any new series resistor need to be added?.
If the original component was selenium it might be necessary as the Vf would be higher but replacing a germanium with silicon would make very little difference. The original appears to have the connections marked so replacement with one of any number of devices should be quite straightforward. Unless "authenticity" is the objective I would have thought that any 1000v piv 2amp bridge would suffice and provide more than adequate safety margins. (I am guessing about a suitable current rating being unfamiliar with demands of the actual circuit). The circuit shown appears to have a 270v HT after the bridge, this would seem to indicate an rms input voltage from the transformer of approximately 195v. The minimum piv rating for the bridge should therefore be 550 volts. (All figures are approximate)

Orakle42.
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