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Old 28th September 2012, 05:20 PM   #11
12E1 is offline 12E1  United Kingdom
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Quote:
Originally Posted by DF96 View Post
If your two HT secondaries are identical then parallel them and feed two GZ34 in parallel. This like your option (b) except the anodes are arranged differently. Avoids hum problem during warm-up, but at the expense of GZ34 overloading during warm-up during the few seconds when only one may be hot enough to function. No worse than (a) though, and only for a few seconds.
Rather than putting the windings directly in parallel I'd put a resistor in series with each rectifier anode. This helps with load balancing between the windings if they are not quite equal in voltage and would possibly also help to ensure that the valve's requirement for a minimum source resistance is met (helps to limit the charging spikes into capacitive loads).

Last edited by 12E1; 28th September 2012 at 05:39 PM.
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