The contrast, brightness and focus controls have to be set at minimum to obtain a reasonable
picture and even then the focus changes with
every camera change. The latter fault can be dealt with partially by adjustment of the contrast
The e.h.t. unit in this set was replaced recently. -M. W. G. Bennett (Epsom, Surrey).
appear to be in the c.h.t. unit, but as this is a recent replacement we would
suggest you check the PL38 driver and ECL80
oscillator valves and associated components, particularly the high value resistors associated with
the latter valve.