Randall Smith.
Features First Introduced by Mesa/Boogie
1969: First high power 1x12 combo (Fender Princeton Boogie)
1969: Half power switch (60w/100w)
1970: Pull gain boost switch (extra mid gain)
1971: High gain cascading pre-amp (the birth of overdrive)
1971: 130 Bass & 130 Lead amps
1972: Mark I
1972: On-Board graphic EQ (footswitchable)
1972: Slave output & level control
1973: Pre-out, power-in jacks (predicessor to the modern effects loop)
1973: Multiple impedance speaker outs (for reliable matching of different speaker cabs)
1978: Lead/rhythm dual-mode amplifier. (First channel switching amp)
1980: Mark IIA
1981: Effects loop (offering signal level and impedance matching for outboard effects)
1982: Simul-Class (combines class A tone with class AB power)
1982: Mark IIB
1982: D-180 rack mount bass amp
1983: Mark IIC
1984: Footswitchable reverb mixes (switches between ambient and drenched)
1984: M-180 & M-190 high-output rack mount tube power (started rack revolution)
1985: Quad Preamp (dual channel rack preamp with four footswitchable modes)
1985: Dual reverb tanks (combined short and long decay for increased richness)
1986: Dyna-Watt power circuit
1986: Modified dual mode front gain preamp (technology used in Caliber & F-series amps)
1996: Studio Preamp
1986: Mark III (Tri-mode amp)
1987: Simul 295 and Stratagy 400 stereo tube rack amps
1989: Mark IV (external control ports, assignable loops, and switchable power voicing)
1989: "Tweed Power" (switchable mains reduction, like an onboard variac)
1990: Dual Caliber
1990: Simul 395 and Stratagy 500 (dual mode, footswitchable "Smart Power" rack power amps)
1990: Tri-Axis (midi controled, fully programable 8 mode tube preamp)
1990: Simul 2:90
1991: Dual Rectifer
1991: Parallel effects loop with mix control for reduced tone loss
1991: Channel cloning (allows duplication of gain structures in different channels)
1992: Triple Rectifier
1994: Maverick & Blue Angel
1995: Progressive linkage (selects different types of power tubes)
1996: Sumul-State power (Tube driven MOS FET power for bass guitar)
1998: Nomad (full array of controls on each of it's three independant channels)
1998: Solo Control (presetable, footswitchable volume boost)
2000: Road King (four complete 3 mode channels)
2000: Road King Progressive Linkage (five power tube options per channel)
2000: Road King Dual Effects Loops (series and parallel, assignable per channel)
2000: Road King External Switching Trigger (for triggering outboard effects)
2000: Road King Speaker Cab Switcher (switches cabs, assignable per channel)
2000: Recto Tracking (auto-matches rectifier to power amp)
2001: Recto Preamp (pure anolog tube recording amplifier)
2002: F-Series
So who's the amp man?