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DB110G (Bogen) 1950s.




I posted some info on these nice old amps some years back.

Fact is, like most of the old school stuff they deliver rather disappointing power and dollops of distortion when pushed.
This doesn't go too well 70 yrs later.

I decided to have a go at uprating it - from the original cathode bias circuit and swop out the tired old 6V6s from years back.
Tired is pretty obvious when you see the voltage on the cathode bias resistor only around 14-15V when it's quoted up to 25V on the original factory papers.

Low current means higher voltage on the anodes so it was supposed to be 360 but could easily be anything from 380-390...as turned out to be the case.
Next step was to put in some of those great old westinghouse large anode 6V6, the ones with the look alike 7591.
That got the original setup working much better, but still anything over 5 watts is dirty.

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Topic - DB110G (Bogen) 1950s. - ivan_terrible 11:20:29 12/26/23 (10)
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