I'm just curious do you know if these tubes would be a good replacement for EL34 tubes I have in my BOYUURANGE Reisong A12 EL34 12AX7 (ECC83) Stereo Single-end Class - A Tube Amplifier? I'm just hoping these GE 6V6G ST tubes would give me a warmer sound or different sound to the EL 34 tubes. I've had the amp for about 4 months and not impressed yet. Seems to sound better with cds than vinyl. I'm running the Luxman DZ 120 CD player directly into the A12 and my turntables through my Sansui AU 7900 using it as a pre amp.