Television 1960s 23" Weltblick 511TR

[Electronic M]

Originally Posted by Retro-guy

Okay I did some searching

I think I have A CONDITION CALLED blooming which causes the raster to expand by 10 % if I turn the brightness up,loses focus in middle to,which it does and is caused by poorly regulated EHT ??

Also when I clunk thru the channels the dim spot goes away and the tube is flashing very bright so I know its a good tube,which means either poorly regulated EHT,B+ maybe...someone mentioned to me that
the B+ that goes to vertical deflection,that the fault might be there ??

Which means if poor regulated EHT ,would cause the tube to not operate at its fullest and I could have a much brighter tube if the things driving it would work properly :d




I just tried it with a 68.000 pf cap which is more then enough in the place of the 56.000 pf but results are pretty much same ...

Most monochrome sets lacked any HV regulation circuitry, And 'HV regulation' (more like HV sag) were usually caused by excessive load on the HV circuit, or the horizontal deflection system being miss-adjusted or having defective parts.