CRT Rejuvination tips and tricks

[sampson159]

back in the shop days,we would "wrap"a crt.cut one filament wire and add a section that we had wrapped around the flyback.1 or 2 wraps usually would increase voltage.let the set play for 30-45 minutes.if the crt brightened during the process,then great!some tubes took longer and some required more wraps.in my over zealous youth,i wrapped some too many times.the picture was good for a day or so,then,suddenly,lights out.i learned to be more cautious in my old age!

[leadlike]

Don't forget to tap the neck to try to clear any shorts that pop up on the tester...

What a lost art this is. I wonder what the crt engineers thought of testing/rejuvination and all the black magic that goes with it...

[zeno]

Originally Posted by leadlike

Don't forget to tap the neck to try to clear any shorts that pop up on the tester...

What a lost art this is. I wonder what the crt engineers thought of testing/rejuvination and all the black magic that goes with it...

We did that. One of those nothin to loose deals, often worked good.

Along with adding a winding to a flyback supplied filament
there is also usually a low ohm resistor in series with the
filament, jump it out. IMHO also last resort but effective !

Sears / Sanyos with Sylvania CRT's that H-K short.
Anyone remember the mod ???
IIRC get the filament above ground, add a 1.5 meg from the
filament to the shorting gun. Also add a .001 cap to ?
Saved a crap load of sets, also worked on others.

73 Zeno