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Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
You double triple checked the phasing?
Also, I am a little worried about how close your secondary is to the mot, in my vttc I had to have about 1/2" of empty space and an aluminum plate between them or it would have trouble oscillating.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
I was also going to question the MOT proximity. Terry Fritz did some analysing of this and found that having the coil central over the MOT helped a lot, but it may still need raising.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Sounds like your feedback was only just enough to start with, and the new tube has less gain than the old one. Try more turns on the feedback winding, and/or a bypass cap across the grid leak resistor if you don't have one already.
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Finished the 3C24 VTTC and now it dosn't work!
