Hi Lew,
I've never seen a load capacitance recommendation for the Ruby, but FWIW the datasheet for the original F-9E lists "operating conditions," upon which the various specs are based, of loads of 80 pf and 100Kohms. Presumably, though, those values were needed to support the specified bandwidth of 45 kHz, that was needed for quadraphonic reproduction, and would be less critical with regular LP's.
Happy holidays! Best regards,
-- Al
I've never seen a load capacitance recommendation for the Ruby, but FWIW the datasheet for the original F-9E lists "operating conditions," upon which the various specs are based, of loads of 80 pf and 100Kohms. Presumably, though, those values were needed to support the specified bandwidth of 45 kHz, that was needed for quadraphonic reproduction, and would be less critical with regular LP's.
Happy holidays! Best regards,
-- Al