In Reply to: RE: now this might have promise...... posted by vinnie2 on July 3, 2015 at 05:30:39:
With a 7k ohms output impedance it will not take very much cable capacitance (shunt to ground capacitance) to cause an audible loss of high frequencies.
Normally preamps are designed to have 1k ohms or less output impedance.
A preamp has to be able to deal with not only the cable capacitance but also the Miller capacitance of the first tube in the power amp. Those two capacitance's add. As an example, if there is 150pF of cable capacitance and 50pF of Miller capacitance the preamp has to be able to "drive" 200pF.
Tre'
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- RE: now this might have promise...... - Tre' 10:27:08 07/03/15 (0)