9/3/2023 0 Comments Carvin bass amp reviews![]() ![]() You’d need to change the surrounding circuit to do that. The 12AX7 spec is fairly tight so another manufacturer’s valve won’t perform significantly differently in terms of the breakup point. It is mimicking the effect of a valve power amp stage, so it needs lots of volume to become noticeable. The valve and the switch are working, so any lack of added valve harmonics us down to the low signal level passing through it. I was really just wondering if it might be worth a try to coax a different tone out of the amp by trying a different tube, but at the moment I am thinking that maybe I should let this sleeping dog lie. Tube in or out the tone from this amp is pretty good, particularly once it goes through my Sansamp BDDI. So, if I take the tube out, and it sounds the same on both settings, what will I have learned? Also, it's on it's own PCB board, and I wonder if the tube might be soldered in? I can't see anything that looks like a socket from the top, and it would be a pain to get under it. That's what at least a dozen reports about Carvin BX amps on the internet report. Which made me wonder what I would learn if I took the tube out? Right now I can't hear any difference between tube in and tube out. I popped the top off, and wiggled the tube. It’s not a simple switch as it’s driving transistor switching circuits, which is why I suggested taking the tube out to check the switching circuits are working properly and are bringing the tube in and out. It only looks like this is going to make much difference at loud gig levels to me, much the same as a loud non-master volume valve bass amp would behave.ĭon't forget that tubes when not overdriven, can be almost as non-distorting as solid state devices, just a bit noisier. So to get it to overdrive, you'll need the master volume up as well as a reasonable level of input drive. It appears to be right before the power amp section, between the pre-amp and the power amp, and is after both the master volume and the limiter. No extra controls for it so it's dependent on upstream signal levels for pushing any drive from it. not in parallel with anything or instead of another solid state stage) with both halves of the 12AX7 in use, but I can't tell how exactly much gain it's been configured for, if any. This tube section looks more like an extra preamp stage (i.e. You can find a circuit diagram for it on line (though there have been quite a few revisions so yours might be slightly different in components). You might notice a slight change in the tone, or amount of gain you get, the 12AX7 is basically a high gain (theoretical maximum of 100) small signal twin-triode tube with a nine-pin base, it is used a lot in guitar amplifiers and some high-end stereo audio equipment.īest thing to do is get hold of a few 12AX7, 7025, and ECC83 tubes and try each of them out one by one till you find one that has a tone you like. You can replace it with a 7025 (basically a low noise version of the 12AX7), an ECC83 (the European equivalent of the 12AX7), a 12AX7A, a 12AX7WA tube and they all should work fine. I am thinking of swapping out the 12AX7 for some other tube, but I don't know much about this and wondered if anyone here had advice about that.and what I might expect by changing the tube? What it seems to do, however is nothin at all. I thought this might make the sound a little warmer, or change the sound of the overdrive. ![]() It's mostly solid state, but has one 12AX7 tube which can be engaged or disengaged. ![]() Mine has class D power, with lots of tone shaping knobs (drive, parametric eq, graphic eq, treble, bass and contour and compression), and weighs in under 6lbs. I gather that it's not that well known outside the US. Carvin stopped producing amps in 2017, but up to then was pretty well known in the US. ![]()
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