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December 9th, 2016, 8:33 pm
Looks like you got your answer, and that answer is no...
December 10th, 2016, 11:27 am
Call them back -- the question to ask is: What is the current rating of the 6.3-volt filament secondary winging of the power transformer?
Knowing that -- you can inventory the tubes on that filament winding and using tube data add up the total current. If there is at least 20% wiggle room left (using the KT-66s) then you are good to go.
A CYA move would be to fuse protect the filament supply to assure against an unwanted surge. Vintage power transformers are not readily available and may be expensive.
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