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building vacuum tubes... some questons
building vacuum tubes... some questons
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Old 28th September 2011, 11:32 PM   #51
Matt BH is offline Matt BH  United Kingdom
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Sorry for the double post, I am on my mobile.

Do be careful prying the inner race off as it will put an axial load on the other bearing, possibly damaging it. Maybe it will fly off with the needlenose and heat.

Another option could be to pack something like thread around the gap between shaft and housing to catch any grit and grinding most of the way through the race with a small grinding wheel in a Dremmel. Careful not to put too much heat into it though.

Making a puller would probably be best.
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Old 29th September 2011, 04:06 AM   #52
Pano is offline Pano  United States
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building vacuum tubes... some questons
Originally Posted by franzm View Post
Take a bifilament car bulb with convenient geometry. Distroy one of the filaments (the lower power one). The result is a very basic direct heated triode (good enough for school demos).
I don't get it. Bifilament lamps have 3 connections. A DHT triode needs 4. What acts as the grid? And how does it work in an argon or xenon filled atmosphere?
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