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Old 22nd Sep 2018, 2:54 pm   #60
Focus Diode
Octode
 
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Join Date: Jan 2006
Location: Borough of Gateshead, UK.
Posts: 1,420
Default Re: Stuck on a BRC 1400!

Hi to you both, I kept the 0.1uf capacitor as 0.1uf. Likewise I replaced C115 with a 1uf replacement.

In addition to near full width being available at the full setting of the width control the frame cramp, knowing it hasn't been completely eliminated, revealed itself too. Increasing the height shows it up further.
Clearly, something is playing up.

The low boost voltage at maximum width setting could be having an effect on the boost supply to the frame stage as well.

I'll look into the kind suggestions above and the high value resistors in the line output stage.

Funny to think, thinking I knew these sets inside out there's only one problem I've experienced before. That's when R45 failed to give lack of sync.

Experienced the width burn up too but replacing the feed with a 680K resistor and 2M2 control (which I've done here), had no further problems. Nor did I on another model I changed for preventative reasons.

Brian
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