Mac Plus ozone?

[Chuck Guzis]

Date: Sun, 13 Apr 2008 09:32:36 -0400
> From: "Curtis H. Wilbar Jr." 

I believe the proper name for the water-based colloidal graphite 
suspension used to coat CRT surfaces is "aquadag". "Dag" is probably 
just a shortened form.  Aquadag paint for repair should still be 
available.

Some old HOTs (horizontal output transformers/flyback transformer) in 
CRT HV supplies develop cracks in the potting material with age and 
sometimes expose the connection of the winding to the HV anode lead.  
This can cause a corona discharge and the ozone smell.  There can 
also be arcing from the HV lead to the chassis.  A lights-out 
inspection will sometimes yield the telltale purple glow of corona 
discharge.  Often, the discharge can be heard by young ears as a 
"hissing" sound.

Good old red glyptal HV dope is the most commonly prescribed cure for 
insulation failures.  I think GC still sells the stuff.

Cheers,
Chuck