If you want to supercharge CH2 and give it some grunt without darkening the overall tone I found the Mullard reissue 12AX7 to be the best performer for V2. I have tried many others including the new Mullard CV4004 only to return to the Mullard reissue 12AX7. Sure it looks like a long plate Sovtek, even resembles the Gold lion B759/12AX7. I have tried both to no avail and hands down the Mullard reissue defeats them all (so far).
It will alter the gain structure and tone. CH2 Crunch will become more sinister, Mark I mode a bit more liquid and amazingly the Edge is not as brittle and thin, it sounds more like the Crunch with a much lower gain setting. Highs are still in abundance and you can add more bass to Mark I mode. You can also enhance the tone and gain structure with a 7025 (Preferred series, Ruby HG, or even the Mullard CV4004 in V3. Keeping the Mesa 12AX7A (JJ tubes) in all other positions works well too. If you use CH2 considerably but feel it may be drowning in the lows too much or just does not have enough bite, the long plate Mullard reissue 12AX7 will definitely fix it.
I have tried running two Mullard reissue tubes with mixed results. (V1 + V2) and (V2 +V3) as well as three (V1, V2, V3). The V2+V3 sounded the best. I prefer to keep the amp tight so V2 and V1 are 7025 type tubes (12AX7) like the Ruby HG or (Preferred series which is the same thing). However the Mullard reissue performed well in a triad arrangement.
It will alter the gain structure and tone. CH2 Crunch will become more sinister, Mark I mode a bit more liquid and amazingly the Edge is not as brittle and thin, it sounds more like the Crunch with a much lower gain setting. Highs are still in abundance and you can add more bass to Mark I mode. You can also enhance the tone and gain structure with a 7025 (Preferred series, Ruby HG, or even the Mullard CV4004 in V3. Keeping the Mesa 12AX7A (JJ tubes) in all other positions works well too. If you use CH2 considerably but feel it may be drowning in the lows too much or just does not have enough bite, the long plate Mullard reissue 12AX7 will definitely fix it.
I have tried running two Mullard reissue tubes with mixed results. (V1 + V2) and (V2 +V3) as well as three (V1, V2, V3). The V2+V3 sounded the best. I prefer to keep the amp tight so V2 and V1 are 7025 type tubes (12AX7) like the Ruby HG or (Preferred series which is the same thing). However the Mullard reissue performed well in a triad arrangement.