19-07-2023, 12:15 PM
(This post was last modified: 19-07-2023, 12:18 PM by Geordie McBoyne.)
In some respects the line timebase circuit in the Ambassador TV2 resembles the Murphy V136. The forward part of the scan is a result of the increase of current in transformer winding L31, this being a negative going sawtooth waveform. At the end of the forward scan the sudden change in current initiates the flyback pulse, this being a function of di/dt. The ringing effect at the end of the flyback is surprisingly well damped. Seems the designer got away without using a damper diode.
It would be interesting to monitor the waveform present on the screen grid of the 20P1.
Geordie McBoyne.
It would be interesting to monitor the waveform present on the screen grid of the 20P1.
Geordie McBoyne.
