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Old 12-29-2011, 01:29 AM
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Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 15,440
Progress & Questions

Okay! I'll start with the questions....

Is it necessary to replace the seleniums before a power up?

And to those whom have installed 1N4007s in place of the seleniums what if any added series resistance value did you use?

And to those who have used newer CRT types than the 21AXP (Nick...) how did you connect the HV button on the CRT to the HV connector on the HV cage? I've got my fingers crossed that this can be safely done without cutting the HV plug off the plastic CRT cover as I entertain the hope of someday having a good 21AXP22 to install......

Also which tubes are supposed to have shields on them?

As for progress......

I've disconnected the Doubler and B+ from the transformer and done a power up to confirm that the power xfmr is still good. The fillaments lit so it would seem that my power transformer is still good.

I'm presently variacing the set with only the doubler caps and seleniums connected to the B+ winding on the xfmr (I unsoldered the B+ lines) so I can reform 3 of the lytics and check the seleniums under power simultaneously.

I've been continuing to clean the chassis as well.
I thoroughly cleaned the inside HV cage including removing the HV rectifier cup for a cleaning.
The place where the HV rectifier cap connects to the fly was missing most of it's wax and kinda loose so I took some dripped wax and built up the wax around it for added support. I was concerned that the the connection on that lead was open so I checked the resistance between it and the HOT cap lead and got within 10% of what sam's lists that resistance value to be which is a good sign. I also for the briefest of moments touched the barrel of my soldering iron to the wax on the HV winding of the fly to melt the outer layer of wax in order to fill in some small cracks in the wax coating.
I replaced the HV cage lytics as well. I replaced the 20uF 25V caps with 22uF 250V replacements, and the 5uF 25V with two 2.2uF 63V Radio Shack "how the heck can new caps have some ESR???" specials connected in parallel (I'll likely change these turkeys later for a better part).

Here are some pictures.....More can be found in the link from the first post in this thread....












EDIT: yes the title is a me using a word play on the title of the opera "The Barber of Seville" as a pun....Glad one a' ya uncultured swine (I'm joking here) gets it. And NO I'm not a fan of Opera (classical aint bad, and I like most popular music from the 50's to the 80's, but Big Band/Swing is what I really LOVE).
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Last edited by Electronic M; 12-29-2011 at 01:41 AM. Reason: Add something.
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