Hor sync problem

[jpdylon]

I would start troubleshooting the AGC and sync section, you may just have too high an input signal that is overloading the set. Moderrn signals from VCRs, cable, etc are often just too high for these sets to handle.

Unless you are certain that 6AQ5 is the proper substitute, I would put the right tube back in before you start troubleshooting.

Just my two cents..

[Giulio Maiocco]

Hi Jordan,

The image, when the Hor is correctly synchronized, looks very good, so I think the 6AQ5 sub is OK. Usually when the TV is turned on, the hor is fine, then after about 30 mins, it starts to shake and finally the sync goes out. Shortly after I started the thread, I noticed the regulation on the oscillator coil needs to be "all screwed in" to get sync when the hor is shakey and it would need to be in even further in to adjust properly.. Could it be a mica cap in the hor section breaking down after a while?

Thanks again

Giulio Maiocco

[Chad Hauris]

You may need to do a thermal test...either take a heat gun or hair dryer when the set is cold and apply heat, or wait till the trouble occurs...then take some freeze spray and start spraying resistors and caps in the horizontal or sync area to see if it will come back.
It probably would be a good idea to unplug the set while spraying the freeze spray on the component, then plug back in and note results.