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Old 6th Jun 2008, 10:46 pm   #9
jim_beacon
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Join Date: Mar 2003
Location: Bishop's Waltham, Hants, UK.
Posts: 939
Default Re: Another (possibly silly) valve question

I've experienced cathode poisoning with transmitters, in the 100W plus range - little used transmitters need new valves evry 4 months, busy ones, the PA valves last 12 to 18 months!

It can also cause problems in small signal amplifiers, Tektronix had a problem with Y amplifiers in some 500 series oscilloscopes - a different valve was developed to overcome the problem.

Jim.
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