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RE: Eimac tetrode verses pentode in triode conection.

Posted by Al Noakes on April 10, 2014 at 07:38:51

In Reply to: Eimac tetrode verses pentode in triode conection. posted by amnesiac on April 9, 2014 at 23:08:30:

You can more or less ignore the G2 ratings in triode mode , have run 4-65A at 750V no problem , just check the current G2 is drawing . With these types with enclosed tubular anode and bright fil , you just can't tell what g2 is doing visually . Those old Eimacs need some colour on the anode to function correctly and away you go . I think I have some 4E27 , these are the ones with the 813 type base ? If so Ra as a triode is around 2k from memory . Try a 4-65A , these measure like an 845 as triode and you should be able to use these with a >5k optx in SE .

Al

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