When you say a "jittery" sound, do you mean as in digital jitter as demonstrated on the Stereophile test CD #1? Or is it a stuttering sound? If it is the latter, I bet that it is your charming Chinese CD player. But rather than guesswork, why not just hook up a tuner or casette or mini disk or 8-track or whatevery you have laying around. If you do this and the stuttering continues, it is the amp or preamp. Either borrow a preamp, or go down to Radio Shack and buy four RCA jacks and the stereo volume pot that they carry and work up a little passive attenuator, sub it for the preamp. If the probem is still there it is the amp, if it is gone, it is the preamp. Easy, no?
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