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What they probably had in mind.....

Tre',

The Eico designers probably used 40 VDC on the plate ( at .83 mA. ) draw for the intermediate stage ( 12AU7, line ) because they wanted to not stress the tubes.

WE find many HF-81s with the original Mullard tubes in them, sounding good in 2007, when they were originally installed in about 1959. Thats pretty good, 48 years with original Mullard tubes.

How many of our current designs will do that after 48 years??


Jeff Medwin


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