Tv picture widener
1 Attachment(s)
Just install under damper tube
It was in the gc catalog gc67 |
It puts a small capacitance, typically 100 pf or so, between cathode and plate of the damper, to increase sweep width. Old techies used to do this, starting with 68pf, 82, 100, or 120pf. But with each step up, the HV drops proportionately. So there's "no free lunch". Above 120pf, the HV loss is too much.
The caps used were disc ceramic, 4KV rated for BW sets, 6KV for color. [EDIT.] Hor output cathode current also drops proportionately with each step up, contributing to "no free lunch". |
That could be an issues if another tech work on the set later and corrected
The low voltage problem and had too much width not knowing of a mod was done |
It wasn't done often, and only in "last resort" cases of insufficient width.
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John |
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