So, the difference in the pedal. Perhaps the GK SS preamp has a higher headroom than the tube preamp, and your used to cranking up the RAT to the point where the preamp (be it tube or solid state) distorts.tallchris wrote: Mon Aug 04, 2025 2:58 pm Yeah I was switching between using a tube preamp into the effects return of the GK or going straight into the GK input, and had to juice up the pedal input when going into the amp vs. the separate preamp. Not sure if that's a normal think w/ tubes in a preamp section vs. solid state, or something else (paging Ben Adrian who probably know this!).
My guess is that the GK preamp has a high headroom and a low output to give plenty of clean volume and transient response for all kinds of bassists with all kinds of basses. So the knobs have to be turned kinda high to fully hi the power amp, especially if you're not driving the GK SS preamp that hard.
Now the tube preamp, it's probably designed to distort, and look smore like a tube guitar amp with regards to distortion and signal level. It's not "playing it safe for hi-fi bassists." So my guess is that it distorts sooner, and puts out a hot level to really drive a tube power amp, if hooked to one.
There's no wrong answer here. If you're doing anything grotesquely wrong, the tone will sound grotesque and wrong.