Re: tube rectifiers

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Posted by metasonix [ 69.111.133.1 ] on July 08, 2004 at 23:43:09:

In Reply to: Re: tube rectifiers posted by manualblock on July 08, 2004 at 07:41:41:

>Why is having full rail voltage on output tube plate during warmup of its filament a problem?

It can cause damage to the tube's cathode coating. It is called cathode stripping. A problem mostly to power tubes running from plate supplies of 400v or greater. IMO, new current production power tubes are more prone to this than NOS.

>Do you mean that the tube rectifier wastes amplifier power or electricity?

It wastes electricity, adds heat to the system (never a good thing), and represents an additional stress on a power transformer.

>Can you wire the standby switch to become completely removed from the circuit after warm-up?

No. Why would you want that?



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