OF COURSE adjusting the bias on a "fixed-bias" amp (that's what "adjustable-bias" is called, "fixed-bias", because you adjust the bias-control to set or "fix" the bias voltage in place don't let it confuse you) will make a difference in that amp's feel, tone and performance it can make a BIG difference. But, better yet, either like the sound of a given MESA/Boogie to start out with, or look for another amp. I will agree that a MESA/boogie running a little hotter bias might better suit some player' tastes (maybe including mine) it's not impossible to have the bias changed, either by swapping component-values, or by having the amp converted to using an adjustable bias-supply. Same difference, right? When you buy output-tubes for a MESA or MESA/Boogie, either buy MESA brand tubes for that amp, or buy from a reputable vendor (like Doug's Tubes, for one excellent example) that can test and rate output-tubes specifically for your MESA/Boogie amp. Here's the deal: on those MESA/Boogie amps that have a non-adjustable, pre-set bias- as long as you use output-tubes that have a "rating" that meets the requirements for that amp, you are good to go think of it as instead of adjusting the bias to suit the tubes, the tubes are chosen to match the pre-set bias. THE ADJUSTABLE AND NON-ADJUSTABLE BIAS DEAL while still being able to hit the amp's "sweet-spots" for overdrive, distortion, and compression without ridiculously high volume levels. especially if you "play the amp" via your guitar's volume-knob and your "touch"- over and over again people will say that a given medium or low powered tube-amp doesn't have enough headroom and blah blah blah, and I'll be able to get tight, clean, clear, present tones by simply CRANKING the amp right up, and rolling my guitar's volume-knob to suit letting the output-section do the work, while not pummeling the input when I want it clean. Speaking of watts, watt- I mean, what are your volume and power needs? Where and how will you most often be playing? If largely at home and the occasional jam, I recommend that you think about amps that are in the 18 and 30 watt range, or an amp with some kind of "power scaling" or "master voltage" power-reduction control that would give you robust low-end and plenty of headroom. These do GREAT, rich vintage to modern Marshall tones on the high-gain Lead channel- think Allman Bros, AC/DC, Eddie Van Halen "brown sound" tones and more all on tap with a twist of your guitar's volume-knob- and beautiful clear, crystal cleans on the Rhythm channel.
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You might also consider the Budda Superdrive Series II line their 18 and 30 watt models are particularly cool. Their Fandango and Suprema models sound like your kind of amps. I'll certainly second the nomination for Rivera their channel-switching amps combine great sounding Marshall and Fender type channels in one amp beautiful, tight, rich tones with great definition and detail. Mesa Preamp, Mesa power amp and Mesa cabinet, that way if you do not like something you could just replace that item(that was my goal).īut if you want the MARK V then buy it, its what your gut says is right, and your Gut knows best. And have you thought of building a rack set up. My total rig is just under 5000$ but thats really two rigs(and if priced new). With 3000$ you should beable to buy a real nice rig. This rig is just as good at some metal and has a different blues sound. My other rig is a Marshall 9001 preamp into tubeworks mosvalve with an SGX nitro for efx, into a custom built 2X12 cabinet(built identical to the Mesa). As to the non biasing factor I do not know, my provalve is not adjustable and it make no difference to me. Its cleans are very fender like, its a great amp. The Mesa pre is great for that heavey metal sound, as well as the blues. I personally have a Mesa Quad preamp into a tubeworks Provalve(4 x 6l6's) into a Mesa vertical 2X12 Recto cab.
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