Foster 9 and Almarg, Obviously I had a brain fart - posted before coffee! :-)
But, changing the measured fixed gain of the pre-amp from voltage to db I think is the extent of my error ( :-)) unless I do not understand how most pre-amps work.
In pre-amps with which I am familar, in the basic circuitry the attenuator is placed before the amplifing stage of the pre-amp. Rotating the VC only changes the strength of the signal from the source to the pre-amp. It does not change the strength of the pre-amps amplifying stage which remains as it was set by Joule at 15db.
Am I wrong? How so?
Foster 9, FWIW and I don't know why it should be worth anything after my first comments, many pre-amp manufacturers suggest that the preferred VC position rests between 10 and 2 o'clock. Something to do with impedences I think, depending on the design of the VC, which makes some sense to me. If there is any validity to that it seems to me that it can be obtained by controlling the pre-amps fixed gain by reducing it internally, by reducing the gain as seen by the amp by attaching incased fixed value attenuators, reducing the strength of the signal of the source, either by initial selection or addition of inline attenuators (incased fixed value resistors). Personally I think there are too potential many tradeoff's trade offs to bother unless one is trying to minimize pre-amp noise, typically seen in a tubed unit.
Al, I always respect your comments and I'll look forward to you edification! :-)
But, changing the measured fixed gain of the pre-amp from voltage to db I think is the extent of my error ( :-)) unless I do not understand how most pre-amps work.
In pre-amps with which I am familar, in the basic circuitry the attenuator is placed before the amplifing stage of the pre-amp. Rotating the VC only changes the strength of the signal from the source to the pre-amp. It does not change the strength of the pre-amps amplifying stage which remains as it was set by Joule at 15db.
Am I wrong? How so?
Foster 9, FWIW and I don't know why it should be worth anything after my first comments, many pre-amp manufacturers suggest that the preferred VC position rests between 10 and 2 o'clock. Something to do with impedences I think, depending on the design of the VC, which makes some sense to me. If there is any validity to that it seems to me that it can be obtained by controlling the pre-amps fixed gain by reducing it internally, by reducing the gain as seen by the amp by attaching incased fixed value attenuators, reducing the strength of the signal of the source, either by initial selection or addition of inline attenuators (incased fixed value resistors). Personally I think there are too potential many tradeoff's trade offs to bother unless one is trying to minimize pre-amp noise, typically seen in a tubed unit.
Al, I always respect your comments and I'll look forward to you edification! :-)