TungSol 12AX7's are nice and quiet. Very little hiss and spit. JJ's sound good but have a tendency to go microphonic after a while.thoughts?
faves,in terms of cost to quality
(just interested in some random advice)
It's important to note that 99.999999999999999999999999999999999999% of any sonic differences will be heard from changing the 1st preamp tube in the signal chain. After that I defy anyone to tell any difference, if blindfolded and kept in a different room while someone ELSE changes the tubes!
The amount of mojo and out and out BS going around about this matter is truly mindboggling! When reading a review that seems a bit over the top pay attention to who wrote it and whether or not he's looking for your money...
As long as you stick with the 12ax7 family (5751, ECC83, 12at7, 7025, etc.), they are direct substitutes (although some will give out less gain), no rewiring needed...except for the Russian military 6H2Π (6N2P or 6H2Pi) tubes that are sold on ebay as dirt cheap 12ax7 substitutes. Using that tube would probably require some rewiring. The 6N2P runs at 6V and I think (don't take my word on it, though) that the preamp sockets in most guitar amps are wired for 12V. Without knowing if and how this would affect the tone (and if the 6N2P sucks or not), rewiring the socket to 6V wouldn't be as drastic a mod as it seems because you'd still be able to switch back to 12ax7 since they can run at 6 or 12V.just wondering...you dont have to bias a preamp tube right?
so im my marshall jcm2000, I could just stick in a new preamp tube in slot 1? without changing anything else?
TungSol 12AX7's are nice and quiet. Very little hiss and spit. JJ's sound good but have a tendency to go microphonic after a while.
You have to watch for some amps like Peavey or Carvin that instead of putting in an extra 12AX7 they flog the hell outta the 1st preamp tube by running plate voltages far higher than spec. That can make some brands like TungSol start squealing. Not the fault of the tube but rather the amp designer. If you try one and get the problem don't blame the tube! Keep it for another amp that was designed properly.
Well, the Legacy does and the 5150 doesn't!Hey Wild Bill,
Would you be willing to shed some light on to which Carvin and Peavey amps suffer from this syndrome?
Rolling the dice of luck, here comes Legacy and 5150!!!
I dunno, i have JJ's in the entire preamp section of my JSX, i like it better then the stock EHX's. do you have a mk1 with two inputs, or a mk2 with the one input?I've found a very good combination that works great in my JSX.
V1 JJ ECC83S, V2 EH 12AX7, V3 JJ ECC83S, V4 Sovtek LPS.
The JJ in the input preamp tube, AKA V1 position, was a great improvment in tone, response and clarity.
I prefer an EH in the V2 spot, which supplies gain to the crunch & ultra channels. The EH made the gain sound much better and gave my ultra channel more of an aggressive bite with tighter attack. The JJ was sluggish and dull sounding in comparision in this spot.
I suggest mixing and matching preamp tube brands because each vary depending on the slot they're put in.