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Bootstrapped Driver- More
For its A30 Amplifier Electro-Voice gives the following specs-
Loop NFB 13 db Drive Plates (Bootstraped Stage) PFB 2 db OP Circuit (Local FB Around Pwr Stage) 17 db Cheers to all, John |
#2
Posted to rec.audio.tubes
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Bootstrapped Driver- More
On Mar 27, 1:21*am, John L Stewart John.L.Stewart.
wrote: For its A30 Amplifier Electro-Voice gives the following specs- Loop NFB *13 db Drive Plates (Bootstraped Stage) *PFB 2 db OP Circuit (Local FB Around Pwr Stage) *17 db Cheers to all, John -- John L Stewart The McIntosh also used bootstrapping to give a small amount of PFB. In the Circlotron and McI the output stage gain is very low so any N&D fed fack through a PFB network does not get amplified much to increase itself, so the lessening of the THD of the driver stage due to the bootstrapping is greater than the increase in N&D by PFB, so a net reduction of THD occurs. And all that is before global NFB is applied. Patrick Turner. |
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