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You should check the currents around that valve. By the way you should recap that ole beast at the points with high currents and tensions. This is:
Filter caps (should always be changed)
The cap that couples one system of EABC 80 to EL84 (pre stage to last stage)
Caps that rule the current and the tensions to the plates
Cannot explain better because of my english.
But remember: Your gear is over 50 years old, and some caps (especially those sealed with tar or those little nasty beasts printed with WIMA should be changed without hesitating. They are known to be down after all this years.)
I strongly advice you to do that. You donīt want your house to be set on fire cause of a 5īcolumn german radio?
Seriously: You are messing around with high currents, and the siemens is very easy to recap. It hasnīt got many of them, and you have a lot of place under the chassis. Also you have the whole documentation. Thatīs worth a lot. If you need help with the german expressions I would be glad to help you. Good luck!
Schatulle means a little box used to store jewels and treasure. Thatīs what you got. So take good care of your baby.
Yours
Alex
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