Quote:
Originally Posted by Electronic M
Marginal tubes can cause issues like lack of oscillation, but usually there should be some deflection especially if you had deflection before the recap.
Recheck your work in the vertical circuit and make sure you didn't install any end of any vertical stage cap to the wrong terminal in the set. Also check B+ voltages to the vertical. If you lost a power supply rail that feeds the vertical that could cause no deflection too.
One thing you can do as a troubleshooting measure on a transformer powered set like that is connect the grid of the output tube to the heater line with a .1uF cap and see if you get some deflection.
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Will check tonight an update.
I forgot to mention the whole reason I'm re-capping this set is the
C2 4 section capacitor did blow out (
overheated, swelled up, and popped) - causing loss of picture. The whole process took 2 seconds, and I shut the set off while the cap popped.
Looking at the diagram
6DT5 tube is connected to one section of C2.
(20uF Square) - I
assume when
C2 blew out, it could have damaged that tube.
I'll dig more into it tonight.
tube by
Thomas Duncan, on Flickr