Bush TV24C

[ppppenguin]

Going back just a little further, energy recovery wasn't done at all in TVs until the Pye B18T in 1948. So all the energy put into the line scan coils in the forward stroke had to be lost as heat somewhere. Damper diodes were sometimes used to improve the scan waveform. With small CRTs and small deflection angles this didn't matter too much. Ultimately, in first generation colour TVs in 1967, the circulating power in the line timebase was around 3kVA! Energy recovery, with a PY500 boost diode, reduced the power consumption to a few hundred watts.

The energy recovery line timebase was actually invented by Blumlein in the 1930s.