Goes to black screen after short warm up (10-30 sec). Measured hor. drive,
this should be 230 Vpp but changes from ca 50 to 150 Vpp. The rate of change
is 50 Hz (the same as line freq. -230v / 50Hz). Should I go for a defective
line trafo ( somehow leaking?) or a defective deflection coil? Due to the
low freq. of the oscillation, I don't think it's bad caps, as could be
expected with high oscillation... Def. coil resistance: hor = 2.0-2.1 ohm,
vert = 6.5 - 6.6 ohm
Any ideas?