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?
[ Tubes Forum ] [ Help ]