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Do It Yourself (DIY) paradise for tube and SET project builders.

Filament Failure!

I lost three KT88's over a year due to 6.6-6.8v filaments. Filament burnout was virtually unheard of in the old days but the new Russian and Chinese tubes seem very critical about filament voltage.

What i did was to bring out the filament transformer primary to a separate AC connector ad used a Sola transformer to feed it.


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