In Reply to: Russian 6C33C A Ticking Tube? posted by megasat16 on April 20, 2015 at 13:13:05:
Yes, the 6C33 draws a lot of heater current (and plate current for that matter). What you are hearing is the thick glass envelope warming up. Every 6C33 that I have used does this a little bit, it's nothing to worry about. (Despite the other answers from folks who haven't used them)
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Follow Ups
- RE: Russian 6C33C A Ticking Tube? - Caucasian Blackplate 10:17:32 04/21/15 (0)