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mica capacitors

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#16

04-07-2015, 12:02 PM

bandersen

RCA 741PCS

Join Date: Mar 2009

Location: Chicago, IL

Posts: 8,813

There's no need to experiment with values. Motorola added retrace suppression to later revisions of TS-18 chassis as shown in this schematic. Earlier versions had pin 3 grounded. This version has pin 3 going to the junction of a 250pF (C-70) cap and a 220K resistor (R-90). That couples a pulse during the vertical retrace to the grid and blanks the raster.

I got this from Riders volume 4.

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