Posted by metasonix [ 69.111.56.60 ] on July 17, 2004 at 22:59:44:

In Reply to: Re: tube rectifiers posted by rohit on July 09, 2004 at 18:34:34:

it is a problem for power tubes. If you apply plate voltage when the cathode is still cold, it can damage the cathode coating. It becomes a problem only above 400v plate voltage. Some of my references claim it's a phantom, because (supposedly) modern tubes have good cathode coatings. But current production tubes aren't as well made as 20-30 years ago, so it's better to be conservative in this area.

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