Tube upgrades for Jolida 502B?

Or the audio grinch who incited incendiary hifi jinks and stole playback of Mannheim steamroller the world over. Hey legacies are hard to come by in this 5 milliseconds of fame world. Happy New Year everyone, at least the solid state folks will just say...wha?

Risking redundancy I offer the following: My Jolida 502p is currently sporting "matched" KT120s, "Preferred" tubestore 7025s (a Chinese version in the 12AX7 family that really sound great), and tubestore sourced NOS JAN Philips 12AT7s that I just installed...the JAN Philips seem to sound a little more refined than the stock EH 12AT7s, and they have the benefit of having more exposed glowing bits and that's always a wonderful thing regardless of sound quality. "We roll because we can", Wolf Garcia 2013.

question about kt120 tubes. i spoke to walter from underwoodwall the other day and asked if i can use 120 tubes in my 502p amp. he said no. i dident ask why but i see other folks here using them. so, whats the story?? is it safe to use kt 120 in this amp. and if yes, do you still bias so the led,s go on??. i understand they use more current or something so wondering if the 502p power supply stiff enough for them. thanks

It has to do with the current supplied from the transformer for the tube "heater" or "filament" elements in the 120s...100mA to 300mA more than KT88s. Walter is simply wrong about this, and based on all the discussion about it in this forum, I'm surprised about that. I bought a 502p a year or so ago and upon getting the approval of the guys at Jolida MD (they said the amp can easily handle the extra current), I took the bold and dangerous step of sticking KT120s in my amp. Yes, I'm clearly a courageous risk taker, but that's how I roll (tube roll anyway). In any case, myself and other courageous risk takers have been using 120s in these amps for a while (in my case almost a year) with zero issues. As part of my ever dilligent KT120 amp explosion death watch campaign, I have yet to hear of ANY amp melting down from using 120s...but I shall continue to my vigilence on behalf of my fellow 120 users, because, clearly, I'm a giver.

thanks wolf, i was hoping to hear from you about this. and what about biasing. just set it till the led light and thats it. couldent these tubes go for alittle more. i think these amps are set for 50 mg's what would happen if we crank it up alittle past the led setting til say the light goes off. would that be like going to 60 or 70.