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Old 11th Jan 2010, 1:56 am   #52
AmadeusMozart
Triode
 
Join Date: Oct 2009
Location: Masterton New Zealand
Posts: 17
Default Re: Homebrew Valve Tester

I am not interested in a transformer but here are my thoughts on the subject:

Some of the power tubes have a plate dissipation in excess of 35 watts. It is always best to test a tube in a setting which is close to its intended use. Similarly some tubes are tested at 250V / 100mA anode current (e.g. 6L6-GC).

I found a toroid on eBay from a seller in Hong Kong which does 200 mA which is a bit overkill. When I was buying this I was aiming for a HT winding of 275 - 300 V @ 135 mA.

Hope this helps, AM.
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