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Old 12th Sep 2017, 3:45 pm   #31
Philips210
Nonode
 
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,562
Default Re: S2055N horizontal deflection transistor keeps failing on CRT TV with the F19 chas

Hi.

I guess that with flyback tuning capacitors in a conventional transistor line output stage it's best to aim for the correct value or slighly higher. Slightly higher will result in increased deflection width due to a reduced EHT.

Something I've noticed with flyback tuning capacitors is the intended frequency of operation is often quoted on the capacitor namely 15.625kHz for the 625 line system. I assume these capacitors have been tailored for best efficiency at or around this frequency. I've not found any explanation for the actual reason for quoting the frequency on the capacitor, perhaps a more experienced forum member might be able to enlighten me on this point.

Regards
Symon.

Last edited by Philips210; 12th Sep 2017 at 3:48 pm. Reason: typo
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