Attempting first project - Some questions if I may

[old_tv_nut]

AGC will have a particular adjustment routine in the service manual.

Generally, setting too low causes low contrast weak picture and even loss of sync, while setting it too high can cause overload and loss of sync (picture breakup). It may be possible to set it high for super contrast without breakup, but then have the picture break up when you change channels.

For my RCA CTC-5, they tell you to adjust upward until breakup, then back off to get a picture, then switch to a blank channel and back; if it breaks up again, reduce the setting some more.

The laboratory procedure for any set would be to adjust for a specified known video detector output level with a scope on a test pattern.

Don't know the recommended procedure for your set, but if you don't have it you can try the breakup-restore procedure. You may very well find that setting it wrong increases the buzz too.

[albanks]

Originally Posted by old_tv_nut

AGC will have a particular adjustment routine in the service manual.

Generally, setting too low causes low contrast weak picture and even loss of sync, while setting it too high can cause overload and loss of sync (picture breakup). It may be possible to set it high for super contrast without breakup, but then have the picture break up when you change channels.

For my RCA CTC-5, they tell you to adjust upward until breakup, then back off to get a picture, then switch to a blank channel and back; if it breaks up again, reduce the setting some more.

The laboratory procedure for any set would be to adjust for a specified known video detector output level with a scope on a test pattern.

Don't know the recommended procedure for your set, but if you don't have it you can try the breakup-restore procedure. You may very well find that setting it wrong increases the buzz too.

Thank you. I will be getting back in there soon. Will check that out!

[albanks]

Another day, another problem.

So this set has been working so great, on for about 30 hours without any problem whatsoever.

A couple of days ago I was faced with a novel problem. The power and volume knob popped off and the plastic lever was seemingly too short to get it back on. Anyway, I did get that back on, unfortunately with the aid of super glue. I did have to pull the plastic lever out a bit too.

While I had it opened up I said let me fool with the ACG so that this could be hopefully the LAST time I have to open it up (at least for a while).

I am not sure what happened but I set it up in a place so I could fool with the buzz control and ACG. Then, it suddenly would not turn on. I mean it turns on, all the tubes light up w/ the exception of the HV rectifier tube. No raster.

Any ideas? Did I short something out? Did it have to do with the fiddling of the on/off switch? Fuse?