I am amazed at the difference
Swapped out the JJ's that came in my Vox AC15HW. I re-tubed the entire amp with the preferred tube package from the tube store. Do not hesitate to do the same. I liked my amp before, but the clarity and warmth with the new tube set is amazing. I would put the tone up against any EL84 boutique amp costing twice as much. My overdrive pedals actually have more note definition. I am a cynic when it comes to the magic "tone" pills you read about in gear forums and I never write reviews. But I haven't stopped smiling since I put these tubes in. Thanks tube store.