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That is an RA-109A with the dreaded 19AP4 glass/metal crt. YOU are SO lucky to find this in the condition it is in.
I had one identical to this from about 1983 till sometime around Y2K. Unfotunatly mine was worse for wear from the get go, and I never really had the room for the VERY large set in my modest abode.
I used to tinker with the thing when I first bought it and I remember just the chassis being a back breaker. I would say that the power transformer alone is at least 20lb. I will never forget being fascinated at the elaborate circuitry and the glow of I think around 30 tubes. You can thank the lord that you DONT have to give this one the once over as there is enough caps and resistors in there to build 3 cheap sets.
More icing on the cake in that there is a fairly recent 19AP4 crt in there. They are notorious for loss of vacuum of the years and from some other posts I have read are getting pretty hard to find in good condition.
Ever since I let my set go to a Richmond collector I have wished that I could find another Dumont, perhaps a smaller one, of similar vintage. The 109 would be perfect for someone who wants to have one huge, beautiful set, as opposed to several smaller, not so beautiful sets as a collection. Heck you need a refrigerator dolly to move one of those things!!
For the record I MAY still have a photocopy of the complete Sams folder for this if you don't have one....Let me know if I need to dig.. Oh an finally DO NOT touch the bell of the crt in any way, shape, or form unless properly discharged. It is METAL!!
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