I’ve owned the QS remote ( 6DJ8 ) and I now use the non remote ( 12AT7 ). You won’t go wrong with either one. Both are very basic with no balance or mono switch. If you don’t need those options they will work great with your M120 amps!
FYI: There are two models of that QS. The older one uses 12AX7 tubes and the newer one uses 12AT7 tubes. Are you sure that the one you have is the newer one? BTW, the new model has no mono switch!
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