I personally feel that JJ ECC83s in V1 of a DR is overkill. The gain gets really fizzy with these tubes. I use either the GT 12AX7-M's or JJ ECC803's in V1... I favor the GT. Then GT12AX7-C's V2, and V3. For the Loop and PI, I use the JJ ECC83's in V4 and V5. Just my .02