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In Reply to: RE: 811A - A2 amplifier posted by sganti on September 13, 2014 at 14:26:49
How's the damping factor with that design?
Follow Ups:
Seems fine with the Def's
The bass is tight and not bloated.
I'm no expert but I think CB's question was a technical one.
I don't see any voltage feedback that would lower the plate resistance of the 811a but I do see current feedback that will increase the plate resistance.
What is the in circuit plate resistance of the 811a and what is the primary impedance of the output transformer?
Thanks.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
There is a 16 ohm winding from the o/p for local cathode feedback, which I use, that lowers the Rp of 811A
I really don't know Rp of 811A in A2 mode, but I have seen 811A amps using anywhere from 3.5K to 7K, so I settled for a James 5K that came with the 16 Ohm feedback winding.
ganti
I stand corrected.
The KNFB does lower the plate resistance.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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