I have a Tascam BR-20 and Teac X2000M, I was running some MRL test tape (7 ½ “& 15”) the BR-20 and X2000M where with in factory spec. from 30 to 20KHz, I was using a two channel scope so I could watch both cannels at the same time, but on the X2000M there was a problem, the left channel sine wave above 9KHz started wandering back and forward why’ll the right channel is rock steady, it did this on both the 2 track and 4 track heads, the Br_20 was rock steady on both channels through the complete frequency rang, dose anyone know what may be causing this?.
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