Fixing a Heater/Cathode short.

[Mauzy]

Someone told me about a year and a half ago how to fix a heater-cathode short in my 19K7201, but I lost the message and couldn't make heads or tails of it at the time. Anyone know of a procedure as to fixing this? I need relatively plain English for this.

[Ken Layton]

At www.randyfromm.com he has podcasts that include the following:

"Shooting the Tube" 
"CRT Rejuvenation and Restoration"
"Heater-to-Cathode Short?  Put a long in it!"

http://randyfromm.com/amusements/techdept/

 

[Mauzy]

Holy crap. I wish I would have found those months ago...

EDIT: Oh you have to pay for them? Man I'm near broke as it is...

[qrz]

you could just wind your own , or  http://www.mcmelectronics.com/product/33-595

qrz

[Mauzy]

Ok, but where does it go?
What would I use to wind? what would I wind around? what am I connecting to?any known tutorial on the web that I can't find for some reason?
Sorry for all the questions but I barely know what a heater and a cathode are, let alone how to fix the problem...

[qrz]

it is to be connected between the filament winding on the flyback and the fil on the crt.

the original winding is gnd referenced ( connected to chassis ground)
when a heater/cathode short occurs, the cathode is then at ground potential via the dc loop through the
fly.

 mcm's iso- block should have installation instructions.

to wind your own secondary , loop 3-4 parallel turns of insulated #22-26 wire around the ferrite core of the fly.

disconnect the filament pins at the crt. connect one side of the new winding to a filament pin.
connect the other to a 2.2 ohm/2 watt resistor . connect the free end of the resistor to the remaining  filament pin.

you will now have an ground isolated filament winding negating the short.

qrz