Hi, I've had my JP2c for about 5 years hassle free. I recently lost all my tone and volume was struggling. I revalved the whole amp with Mesa Tubes and volume issue sorted and tone is nearly there. My tone is now really bassy even with the bass off and it doesn't seem to have that smooth/creamy sound I love about the amp. power tubes are both matching pairs but my preamp tubes are slightly different. V1 -V4 are now SPX7 (the ones with the shrink wrap) and V5 is a groove tubes 12AX7. I ordered 12AX7 from the store but this is what they sent and I had a gig so hd to install them. would these preamp tubes possibly be my issue? or may they be something else wrong with the amp