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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: Dyna PAS2 preamp and amp impedance posted by fstein on August 9, 2012 at 06:19:10:
....using the broad rule of thumb that the input impedance should be a minimum of 20X the output impedance, you get a figure of 20K ohms minimum. 50K ohms would be better still.
Since if the caps are original they would need to be changed, you can easily go up to .47 for the output coupling caps. I have even gotten away with 1.0 with no motorboating. This will improve the drive at the low end.
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Follow Ups
- The output impedance of the preamp is 1K ohms......... - viridian 13:51:07 08/09/12 (1)
- Loading the output impedance need not be that much higher... - Interstage Tranny 16:46:28 08/10/12 (0)
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