CT-100 B1001599 Failed Convergence Transformer

[jhalphen]

Hi to all,
Hi Penthode,

more info about CT-100's V convergence transformer on Phil Nelson's restoration chronicle + photo of Folsom's Xformer & EHT cage wiring diagram:

https://antiqueradio.org/RCACT-100Television.htm

about risk of Focus Pot failure & solutions, here's how Miniman82 (Nick W.) solved the issue when he restored his CT-100 in 2011:

https://antiqueradios.com/forums/vie...p?f=3&t=175030

Convergence (H & V) theory of operation - extracted from this 19 page CT-100 RCA document (page 18):
https://antiqueradio.org/art/THE%20C...20RECEIVER.pdf

"The dynamic convergence and focus modulation voltages, each having the proper waveform, amplitude, and synchronism with deflection, are produced by linear addition of a variable shape vertical parabola with a variable phase horizontal sine wave. The composite alternating output voltage is coupled to the kinescope convergence electrode and focus electrode through the respective output taps.
The vertical-deflection dynamic convergence amplifier circuit combines, shapes, and amplifies the parabola and sawtooth waveforms derived from the vertical-deflection circuit for application to the kinescope."

"Sine-wave horizontal dynamic waveform is derived from two cascaded tuned circuits excited by horizontal kickback."

+2 last photos:
V convergence waveform shape (no scope photo nor measurements values) from SAMS CT-100 SM on ETF site.

Convergence section schematic from CT-100 Service Clinic manual (page 31) on ETF web site.
Sorry! for tiny size, forum display limitation.
http://www.earlytelevision.org/tv_sc...ams_color.html

scroll down to RCA CT-100 section.

Best Regards
jhalphen
Paris/France