Another pair may drive the in and out of the reverb loop. One is first gain stage, a second is volume stage to the power section. I'm not familiar with your amp, but a typical amp might have 2 to 5 preamp tubes. Some people think Tele ribbed are better than Tele smooth, but I like them both. NOS teles are maybe $40 each good used maybe $30 each. But I use them, crank the gain up higher, and forego the option of heavy overdrive. The "at" and "au" are lower output, so if you know you need heavy overdrive, you can skip those. Ditto Mullard (although Mullards are the most "neutral" of the bunch, and I don't use many of them). Also buy the same models of black-plate RCA's. If you have a budget, buy Telefunken 12at7, 12au7, and 12ax7 (aka ECC81, ECC82, and ECC83, the European codes). Make no mistake, fiddling for a whole day with a wide selection of vintage tubes will open your ears to a world you never imagined existed. This is just as delicate and subtle as choosing a mic/pre combination for the lead vocal track. For el84 and el34 power tubes, Mullard is king. For the preamp stage, my favorites are Telefunken and black-plate RCA. It has that major label vibe.ĭoh! The tubes are fully 1/2 the sound of a guitar amp! (I'm a little obsessive about this subject.) Every brand and model of tube has a different sound. As far as the recording chain itself is concerned I use the 121 -> TG-2 -> Vintech X73i EQ and I think it sounds great. The guitar, amp, and cab are way more important. ![]() Remember this is only a small percentage of the chain. ![]() I don't think the groove tubes will make the JMP-1 sound worse than with stock tubes, but yeah never know. Harmony-Central has a guitar players forum, maybe you might want to check over there for some opinions. It seems to be a smoother distortion where notes articulate slightly better. ![]() This is so subjective though (possibly more so than most topics discussed here). I liked them better than the stock tubes, better than mesas that I tried, and better than Electro Harmonics. I have only tried them in my Marshall TSL 602 combo. I have not heard the groove tubes in the JMP1, which is what the original poster asked. Are you talking about a JMP1 here? Karl, good call.
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