I have had the exact opposite experience. I have a 1970 (no MV), a 1972 and 1974 both with MV knobs.redchapterjubilee wrote: ↑Mon Aug 20, 2018 6:06 amSilverfaces all seem to sound the same regardless of master volume or 100/135 w. Heavy, loud, clean.
The 1970 100w is the most “transparent” of the three. Lots of bass with a hefty serving of mid-highs. Not a lot of tinkly highs. Because there is no MV, I find this one pretty easy to find a good level in the room.
The 1972 100w is BRIGHT as hell with almost no bass freqs. Kind of like a tin can. Sounds perfect for that spaghetti western “total scoop” tone.
The 1974 is 120w and about 20 pounds heavier. I can believe it’s 100 pounds. This amp is clean and bassy. Sounds like a blues amp, almost no highs and hardly any mids. Also, I can turn the gain and master volume both to 10 and the tone is still clean.
In summary, I need all three together to get the correct surf tone!
The master volume turned up to 10 basically makes the adjustments identical to those made without one.
..... or turn it up and let 'em bleed! They take pedals very well. J Mascis said in a Reverb.com interview that he thinks people lose dynamics by wanting to crank an amp. He likes to have a clean sound and use an overdrive pedal to dirty it up a bit and uses a Muff or other fuzz pedal to boost the volume for leads. Gives him volume change instead of the clean and lead being the same volume. If you crank the amp (he said), you have no where to go. It is all just loud and has no dynamics. Twins are great for this concept. They tend to be clean machines. You can get some of them to break up, but not normally at a volume that the police will be happy with. If you like using pedals or just like clean sounds, Twins rule. Loads of musicians use them this way. With their volume, it would be hard for you to be lost in the mix... 
