Jolida 502 KT120 tube swapping

Don't be sorry. I appreciate the feedback and respect your technical tweak choices, although you assume I have the ability to install, match, and adjust this stuff when I rarely venture past soldering something that looks unsoldered. That said, I'll look into your suggestions and see if I trust myself to do the surgery. I have spoken to everybody but the janitor at Jolida at length about the KT120 having enough current available to not melt my amp, and they assure me it's overbuilt to easily handle the 120s. If it blows up they'll fix it (at least for the next 2 years). Along with the KT120 appealing to me as an amusing tweak, I'll certainly be trying whatever KT88s seem interesting also. I do plan to mess with the input tubes (I roll tubes in my guitar amps from time to time and do notice obvious differences)...I mean really...this is the entire point of this amp for me...I can mess with it! In any case, thanks again for the feedback...nice to know there's a braintrust out there.

SO...I put the KT120s in the 502P..and they work swimmingly. It is a LARGE tube in every way. Just more of everything...power (hard to say how much, but it's there), better, sweeter treble...more overall tonal range across the board. They do run hotter of course, but highly recommended at least until my amp blows up! (Talked to Jolida again and Mister Allen says no worries...and he's the warranty man!).

Hey Wolf

In order to get the KT120 into the Jolida 502P did any special modifications have to be done to it so that KT120s could be used in place of the 6550s? Was it just drop 'em in run the EZ-Bias? Also where did you get the KT120 tubes? The more I look at the Jolida 502P and reading about it I keep thinking about getting one.

Thanks

Other than the "upgrades" they did on the amp before shipping there are no mods...I just dropped the 120s in and I bias them to the 502P specs and check it with my trusty Radio Shack meter just for the hell of it (a compulsion, but I'm getting better at not burning my fingers while poking the probes into the test port), even though the "ez bias" works well...In fact, now that the KT120s have settled in it sounds better than I noted in my last post, just fuller and brighter. Highly recommended! I bought the 4 "matched" tubes from "Ctech" on Ebay mostly because of their price, and they're on the East Coast so they shipped really fast. I don't think there's anything to risk buying one of these amps as they seem to be an insane bargain for something that sounds this good.

Upon reading this thread I tried the KT120. Its almost 2 weeks now and I really like it a lot!

Just wondering what pre-amp tubes should I use? I got a recommendation from a Jolida tech that SED (Winged C) is a good option. Have someone tried it?

Thank you for sharing!