Quote:
Originally Posted by G6Tanuki
Fuses in the B+ side I accept (not just one fuse in the centre-tap-to-earth; that won't save your transformer if a diode fails s/c!).
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Practicality tends to rule nowadays, with a minimal update of old equipment including a PT secondary side CT fuse, and either new ss diodes, or inserting ss diodes in series with valve diodes.
The addition of an ss diode in series with a valve diode provides protection against valve diode s/c.
Some equipment needs fusing in each leg of a full-wave CT rectifier circuit, such as when a bias supply is derived from one of the legs.