This three chassis KRS-2/ krsp-2 was in full working order on arrival, it was clear after a full appraisal of this sonic legend, that it needed to be brought into the new millennium.
The guys at Krell were a great help, however many of the masters of data for KRS series are lost, they made up for it with internal discussions and advised on aspects that would improve clarity and performance. This took over a year to collate.
Naturally with a Class A preamp of this vintage, electrolytic caps need replaced, this was done with Elna Silmic II's, Nichicon FG's and for the last stage of smoothing, Vishay 021KO's (previously 021ASM) with their non resonant cans. These update the likes of Panasonic FM's and older Nichicons types with specific focus on keeping the ESR low as possible….and they are all matched. The elnas were superb with no need for buying more to match, the vishays required three times as many in order to match and the nichicons needed around six times the order quantity to get a match.
The potentiometer was replaced with a Penny & Giles RF15A 10K Model D219992, what a difference from the Spectrol wire wound! Six month waiting time.
inter PCB connections were re-done with 99% silver/ 1%Gold wire.
I have yet to replace the internal signal wiring on the pre chassis. It looks like a balance patch type cable, and there is a lot of it.
The smoothing chassis has yet to have poly film cap filters replaced due to proximity to heatsinks and Motorola equivalents for the discrete tracking regulators have been sourced.
It has a total 212,000uF smoothing capacitance.
The fuse for 240v use is a 1.5A slow blow.
the sound?
there is none…
I'm hearing the music, the magic of studios and full depth of clarity and reveal.
Eargasm!
prior to refit:
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any suggestions for replacement? these have been considered: Vandamme 268-026-000 starquad cable but the diameter is too large, so perhaps 268-000-000 reduced OD console cable.