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Nederlands Forum over Oude Radio's |
Re: Regenereren indirect verhitte buizen
Geschreven door Peter op 03. Apr 2006 04:03:46:
In reactie op: Regenereren indirect verhitte buizen geschreven door Marcel van de Gevel op 02. Apr 2006 15:19:02:
Deze tekst had ik gevonden over indirect verhitte buizen:
The indirectly heated cathode is the more modern type of emitter consisting of a metal sleeve with the oxide layer on the exterior and the filament mounted in the interior. These tube types should initially be operated at the rated filament voltage for at least one hour and then checked for quality and stability. If they still are not satisfactory, then the following procedure should be used. With the tube in the tube tester, increase the filament voltage to 120% of rating while carefully watching the plate current or tube tester meter reading. The meter reading will slowly increase, hit a peak, then start to decrease. At the point of maximum reading, reduce the filament voltage back to rated value. Continue to operate the tube at rated filament voltage for at least four hours, then test. When two tests spaced one hour apart provide the same reading, the tube is rejuvenated as much as possible.
Peter.