Forums https://www.decware.com/cgi-bin/yabb22/YaBB.pl EQUIPMENT FORUMS >> ZBOX >> ZROCK3 Tube Rolling https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1794598167 Message started by Alfalover on 11/13/26 at 19:29:27

Title: ZROCK3 Tube Rolling Post by Alfalover on 11/13/26 at 19:29:27 I just received a ZROCK3 and added it to my system (Naim Supernait 3, a pair of Magnepan MG-12SQ speakers, custom modified by Magnastand,, a Linn LP12 with Sound-Smith Carmen phono cart., and a Black Ice F159 phono preamp). With the tube that was supplied by Steve, the bass was a little overwhelming. The knob on the front panel could not go past the one o'clock position. The solution was to try tube rolling. A 1957 Raytheon 12AU7 PLATINUM PLUS Grade Preamp Tube 90% NOS found for $21.95 on eBay, solved the issue (tested at as NOS). Now with a less bass-heavy 12AU7 tube, I can move the knob to the past two o'clock position. This provides a tighter bass that I can still feel in my body. Moving the front knob higher allows the ZROCK 3 to tame the high end. Does any one else suggest a tube for the ZROCK3

Title: Re: ZROCK3 Tube Rolling Post by Lon on 11/13/26 at 19:39:40 I would suggest looking at 5814A types, these may give you the range you are looking for in my experience. I have tried Raytheon and GE types with successful sound.

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