I have a Yaqin MC 10L: http://www.ebay.com/itm/YAQIN-MC-10L-Push-Pull-Integrated-Stereo-Tube-Amplifier-/141323298889 http://www.ebay.com/itm/YAQIN-MC-10L-Push-

I have a Yaqin MC 10L: http://www.ebay.com/itm/YAQIN-MC-10L-Push-Pull-Integrated-Stereo-Tube-Amplifier-/141323298889 http://www.ebay.com/itm/YAQIN-MC-10L-Push-Pull-Integrated-St... With aftermarket tubes: http://psvanetube.com/wordpress/purchase/shuguang-treasure-series-vacuum-tubes/ http://psvanetube.com/wordpress/purchase/shuguang-treasure-s... The amp is super heavy (40+ lbs), so shipping is expensive. I like it a lot--definitely changes the sound to something warmer. It's also a beautiful object, especially in the dark. The aftermarket tubes helped resolve bass, but are probably overkill (I used them as a reward to myself for crunch on a contract gig). Note that tube amps have a lot of downsides--you can't leave them on 24/7, they make a lot of heat (so can't stack with other electronics), you need to tune voltage during the first few months of operation, only stereo output with minimal AV switching, etc...