Thread: Flyback Failure
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  #15  
Old 09-20-2005, 10:20 PM
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nasadowsk nasadowsk is offline
Damn does run fast…
 
Join Date: Jul 2004
Location: Catawissa, PA
Posts: 951
Ok, I disconnected the vert section from the boost - this set hangs the vert osc AND output off the boost, amazingly.

There was a 20mfd cap that was holding things down, but even still, my boost is only at 320V or so. Enough to light the 1B3 and get a dim fuzzy line. I temp wound a few extra turns (ok, 1 extra) on the flyback with some 25kv wire for the 1b3's filiment. Seems safer than a D cell

I'm getting 9kv now. It seems the horz section's weak, but it's on frequency best I can tell - I ran it up/down until I got max HV. I see the mica on the yoke but no value. I'm gonna pull the tube to clean it in a while anyway, so I'll look at it then.

Am I right in that I can't check for the dreaded keystone without vert sweep?

The flyback *still* isn't getting warm, in fact it feels ice cold after a few min of operation and then powering off. I see a .25 that runs between the 340 supply and the damper's cathode - that looks like a good suspect.

I'm not sure where the boost should be though. I'm guessing above 340 (else no reason to have it!) but the .25 is rated 600V and the 20mfd I think is a 450 unit (but has a 10k resistor feeding it). My out of ass number is in the 400's...

I think I see what's going on here, almost. I'm gonna replace all the caps soon anyway, but I wanna see if I can tackle this boost issue now cause it's driving me NUTS.

I'm not even close to sticking a fork in the flyback, but I'll keep in mind you can probbably find one, polaraman... I think the yoke's a bigger suspect though I'm not convinced it's bad either yet...
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