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Re: ping Mike, about that Altec 1570B amp

Ciao Gluca,

How about a voltage amp stage before the 807's and drop the last stage? The 811A probably draws a little grid current all the time (this I get from staring at the data sheets, only), and as the grid swings most positive, would seem to draw 40mA or as much as 60mA (or more?), depending on the plate load.

Now I see, you'd limit the 811A's operating range there, making the EXO-099's 10mA cathode draw a good fit.

Mine is only idle scratching, but I'm fascinated with the idea of class B 811A, beyond the "balanced" class B of your schematic, to the PP pair switching on and off, from the sheets, of 750Vp, 5K1 a-a load and shared idle current of 36mA (probably need to plan for 300mA+ swings). And mostly, I wonder what this kind of circuit sounds like.... --keto


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  • Re: ping Mike, about that Altec 1570B amp - keto 11/24/0505:43:34 11/24/05 (0)


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