Just one more idea that hasn't yet been mentioned which is to check the input impedance on the CJ amp . . . The output impedance of the FS is rather high and if my memory is correct it is about 1700 ohms. So using a rule of thumb between preamp output impedance and amp input impedance of 50:1 or even better yet 100:1 then your CJ input impedance would need to be 85K or 170K respectively.
I have used VTL ST-150 with an input impedance of 100K ohms and currently an Art Audio PX25 amp with great results.
I have used VTL ST-150 with an input impedance of 100K ohms and currently an Art Audio PX25 amp with great results.