And it does work. I haven't had problems getting a good band volume with the Plexi in 50w, two tubes only, and a 2x12", in the middle of the room my cell phone dB meter says about 85dB.
BUT the Plexi, even if it does have a master volume, is a fickle amp for the whole gain chain. If you change the master volume, the sound changes rather drastically. If you turn it up much, forget about getting a clean sound outta it. Change gain, you need to change also the master volume.
In reality, I've had to heavily change the volume going IN the amp, to create suitable sounds from rather clean to lead drive. Always a compromise with a 1-channel amp, and as a result I've had to send a rather quiet signal into the amp and add some drive from my GT-8 in front, to create enough variation.
Now, what this brake does, is I can dial in a sound where I can freely set the gain and master volume just right, so that it's rather spanky clean with light playing and neck pup, and goes into slight, tight crunch when hit harder, but there is still headroom left for lead boost.
And of course, set like that, it does become too loud.
Well, a brake like this easily knocks out the excess dBs and gives me proper volume control with one big and easy knob without changing the sound at all.
Now it's possible to have the master over halfway, and proper hot signal into the amp and still have a nice spanky RHCP clean and very little need for OD boost even for heavy sounds.
When I have the brake at halfway mark, it now gives the same dB as before,, but there's easily 20dB adjust range either way without change in volume, and I was able to take out lots of OD boost, EQ and noise gate, as with the gains correct all the way through the chain, it's also totally quiet with absolutely zero noise when no sound is going through.
Well worth the money (circa $80).
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