I currently am running the EH KT-88's in my 502, to good result. I tend to think that the driver and pre tubes affect things a little more than the power tubes. Running a set of Mullard 4024's in the 12at7 positions, and tung-sol reissue 12ax7's in the pre positions have supplied really nice sound. The bass is not soft in any way-hits a little like solid state. I'm an electric bass player sensitive to that frequency region and I simply couldn't live with flabby bass. Hope this helps a little. -Fish
Tube upgrades for Jolida 502B?
I realize this is something that has come up before, though in searching the archives I didn't come away with a clear path forward. My amp is completely stock and came equipped with Sovtek 6550s. Using it to drive Totem Forest speakers. I contacted Jolida. They recommend KT88s. Their reply is a bit unclear but they might be suggesting Electro Harmonix. They also indicate reliability issues with Chinese KT88s. Response Audio (Jolida dealer and modder) recommends Shuguang KT88s (Chinese). The Tube Store recommended JJ Tesla KT88s on the strength of their great imaging and deep bass (more bass being something I was looking for). I was initially leaning towards SED Winged "C" 6550s. Now I am a bit more confused. I'm curious about KT88 vs 6550 sonics and reliability differences. Thanks in advance to any one willing to take the time to share their experience and preferences.