"Gain" is often misused term. In this thread as well. What you really are after is distortion.
Gain not a function, but a scale. Low output pickups put out less gain, high output put more. It doesn't create any grit or distorted tone (but hitting strings heavy does).
Most pedals do their distortion with clipping diodes, which is different thing. Some "high gain" (another misnomer, should be "high distortion") amps do that as well. Others (like 6505) cascade input through multiple overdriven tubes, each adding more, to achieve high distortion levels.
This is a very good option for affordable and not to mention compact way of achieving those sounds which is a godsend if you're interested in playing any shows that involve flying interstate or overseas so if any of the amps I mentioned are out of your price range, this is a perfectly legitimate way of going about it. Some of them are even modeled in those Mooer micro and AMT preamps. You can check them out here.Sure, as long as the amp is high gain. In my mind a discreto guitar power amp (PowerStage, Stealth) and a preamp pedal (Mooer UK Gold, AMT S2, etc) are am affordable way to create am affordable and small high gain amp head.
Plot twist: metal can be played on an acoustic guitar
I'd love to try an AMT dual stage pedal through a Powerstage 700 into a full stack of Texas Heat and Swamp Thang speakers.
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Heavy metal is how you play....
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I'd love to try an AMT dual stage pedal through a Powerstage 700 into a full stack of Texas Heat and Swamp Thang speakers.
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Maybe there's something of a language barrier at play, but the usage of "gain" in this post isn't entirely correct either.
Gain is a scale; specifically how much signal strength is increased by a stage of amplification be it a pedal, amp, or something else. Passive pickups don't have gain by definition because they don't amplify anything. Active pickups incorporate a preamp stage which can amplify signal, but they're typically designed merely to output a low impedance signal. Low or high output pickups simply produce a weaker or stronger signal respectively.
High gain is absolutely the correct term for these amps. Their preamp stage(s) have large amounts of amplification (gain), and subsequent stages are designed to run out of headroom intentionally causing distortion. With tube amps it's even possible to change the amount of available preamp gain by using different tubes. For example the 12AX7 spec states an amplification factor of 100, while a 5751 has an amplification factor of 70 and a 12AY7 has an amplification factor of 45. These factors literally compare how much gain the given tube provides.