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Old 05-30-2016, 12:40 PM
DaveWM DaveWM is offline
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Join Date: Feb 2009
Location: Orlando FL
Posts: 5,607
regarding cleaning, pls don't go overboard on this, its easy to mess things up, I always say check it out as is, monitor the B+, the AC current draw, the HOT current, and the HV. Pull the horz out tube and the vert out tube and do a slow power up on a varic start in about 20vac slowly go up to about 80vac waiting about 10 min every 10v, monitor the can cap heat, watch out for any cardboard covered or chassis isolated can cap, the are used in doublers and will have B+ on the metal can.

Stop the variac if AC current goes over 3 amps, stop when if the B+ gets to 400v (less than full line voltage with no horz out tube installed).

If all that passes put the horz out and the vert out back in and go for a full power start up, again monitor the AC line current and the horz out cathode current, should be about 3.5 amps max on the line and 200-210 ma max on the horz out cathode. IF the HV comes up make sure it does not go over 25kv if so stop.

Often these old sets will be fine as is, the slow power up may make the can caps reform if they have not seen voltage in a very long time. full power with out the variac risk shorting a can cap.

The problem with cleaning is you can do damage that can be very hard to diagnose. if it works before cleaning then go ahead and clean some and test again. That way if you muck up something you will have a good Idea where to start.
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