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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Tube lifetime posted by Paul Joppa on January 9, 2002 at 22:18:32:
Hi,In "ham books" one is teached that tungsten - but just tungsten - filaments should be run at voltages so that they match the output (ie. conservative output should be used with lesser filament voltage a.s.o.) for longlivety.
Toriated could be run - 10-15% if the anode power is low, but not less. Though a soft voltage rise at start up is a good thing.
Both types - especially the first - should be run om AC (or if DC is to be used the polarity should be changed a little now and then).
Cathode sleve heaters should be used at nominal +/-5% (10% for modern small signal) AC or DC is unimportant, though "series heating types" shouldn't be used with "dead hard" current limiting devices as they may not even heat up...
So much from memory out of "ham books".
In practice: Donno!mvh /Pär
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