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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: RE: Fisher KX-200 posted by Awe-d-o-file on July 1, 2015 at 05:24:54:
I know that Jim stocks 'lytics that physically fit in 500C and 800C Fisher receivers. I suspect those parts would be a good fit for the KX-200.
Basically, the "McShane Treatment" is: better B+ diodes, increased capacitance (both filter and decoupling), and inrush current limiting.
You can buck up the bias supply by installing Schottky diodes and making the rail's reservoir cap. a Nichicon KZ (muze).
Current production EH 7591s are intolerant of the liberties Fisher took with the grid to ground resistance limit. Jim's site shows how to fix that with passive parts value changes. I advocate going further and replacing the 12AX7 "driver" tube with a 12DW7. Fisher provides the template for that change in the X-100. ;>) IMO, ceasing to use the 12DW7 was a "bean counting" thing to buck profits up. :>(( The 'X7 triode makes a VERY poor "concertina" phase splitter.
Eli D.
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