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Re: in defense of the 7199's...

Actually the ST70 stresses the heater cathode insulation in the 7199 and can prematurely cause failure. A simple voltage divider to raise the filament voltage to around +75vdc will increase the 7199 lifespan. Sound Practices had a nice little article on the subject several years ago.

I can forward the article as a .PDF file if you'd like to see it.



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