Owner's Manual only showing the tone of my 1992 dual recto revision f - serial number r0780 after a fresh re-tube the with sed winged c 6l6s, jj 12ax7s and electo-harmonix (russian) 5u4gbeh. the simul-class system has been a staple in mark series amplifiers since then, as well as the 5-band graphic equalizer, both exclusive to the line until the introduction of the dual caliber series, and select power amplifiers. employee spotlight and round table discussion: john marshall ~ circuit ambassador of the new dual and triple rectifiers and discussion with director of r & d, doug west and director of sales, steve mueller. some guys say that if you don’t have one of the original pre-500 serial numbers, you don’t have a rectifier.
Mesa Boogie Mark Series - Wikipedia express line of guitar amplifiers was released in 2007, and has essentially replaced the f-series in the mesa boogie line up. based on parts being available or any number of things that can change without us having any control over them, we have to go forward with our own ears and our sense of what is best. based on parts being available or any number of things that can change without us having any control over them, we have to go forward with our own ears and our sense of what is best. mark series of amplifiers was mesa's flagship product until the introduction of the rectifier series.