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In Reply to: RE: PAS3 - Tone Controls Bypassed - Need to connect up to a 50k Ohm Active Crossover posted by aguaazul@gmail.com on February 04, 2014 at 10:43:19
No.... loading resistors are used to provide proper termination for the PAS with the stock tone controls to operate correctly when the preamp sees a 100K ohm load. They don't offer more drive current - IOW lower source impedance
There is no way to modify the existing circuit (without changing stage 2 to a CF) to lower the Zout
Follow Ups:
Dynaco quoted the original release of the PAS as being good into a Z-in of 470K, or, with the 510K resistor removed, into Z-in of 250K. With the x-mod, the PAS was good into Z-in of 100K without changing or removing any resistors.Joe, if by "terminating resistors" you are referring to the 62k and the 510k, they did not change in value when Dynaco transitioned from the original to the x-mod version.
Could you elaborate further?
Edits: 02/04/14 02/04/14
The 62K and 510K resistors were chosen so that the effective impedance presented to the PAS line amplifier output stage (when combined with the load from the power amplifier) is correct for the proper operation of the tone controls.
Joe,how much is the CF mod? I'd drop off and pick up.
Randall Nerison
I haven't given this any thought - lets discuss off forum. You have my e-mail
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