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Your Shindo is 5kohm!!! output impedance, (Stereophile "manufacturer's specified output impedance is 5k ohms") and really should be used with amps that are 50kohm or higher input impedance.
The Pass X250.5 from what I could find is 20kohms and really needs a preamp with below, say 1kohm output impedance.
Not saying it won't work, just that the Pass may load down the Shindo a bit, and you may not get the best out of it.
It's silly to have output impedances this high for active pre's or sources.
If you don’t remember your friends model of Pass as you said, it may have well been a good impedance match, as not many Pass amps are this low (20kohm) input impedance, most are much higher.