Wilfred,
The astig pot could be dirty/bad by your description. The crt socket could be dirty and needs to be cleaned and reseated. R1486 is a known resistor that will be high in value. A Vishay VR37 will replace it. The 10meg, R1427 could be too high in value. There are other resistors that should be increased in wattage. Any 0367 transistors should be checked for leakage from C to E and replace with KSP10BU if any are leaky.
Being the age it is, recapping is advised. C1481 can be replaced with a film type.
The two 1,5A bridge rectifiers should be replaced with 4A.
Mark
