Road King Manual - Mesa Boogie

A +BREAR PANEL CONTROLS & FEATURES (Continued)HEAD VERSION2 x EL 34 and 4 x 6L6(partial rear chassis view)EL 34 EL 346L6 GCSTR 4306L6 GCSTR 4306L6 GCSTR 4306L6 GCSTR 430LEVELSLAVECAUTION: USE SHORTING PLUG IF NO SPKR IN BAMESA BOOGIECH 1CH 2REVERBOFF OFFLOOP 2 LOOP 1ADIODEOFF OFFLOOP 2 LOOP 1A +BDIODEON ON BCH 2NORMAL 2x6L62x 2xEL34 4xEL34 6L6ARECTOTUBE-TRACKINGOFF OFFLOOP 2 LOOP 1A +BDIODEON ON BCH 3NORMAL 2x6L62x 2xEL34 4xEL34 6L6ARECTOTUBE-TRACKINGOFF OFFLOOP 2 LOOP 1A +BON ON BCH 4NORMAL 2x6L62x 2xEL34 4xEL34 6L6ADIODERECTOTUBE-TRACKINGPULSELATCHEXT TRIGGERSRETURN 2NORMALSEND 2NORMALRETURN1BYPASSLOOPS, SOLO& MASTERCONTROLSLOOP 2 LOOP 1CH1 CH2EXTSWITCHREV ERBCH3 CH4SOLOFOOTCONTROLLERFUSEPOWER FUSE120 V~ 4 AONONNORMAL10% 90%LOOP 2MIXCH 12xEL342x6L6RECTOTUBE-TRACKING2x6L62xEL34 4x6L62xEL+4x6L6PROGRESSIVELINKAGERECTIFIER SELECT with TUBE TRACKING: This amazing feature takes our patented Dual Switchable Rectifier concept a stepfurther and allows the tube rectifier circuit to track the PROGRESSIVE LINKAGE switchable power and provide the correct amount ofrectification for each power section. The original choices of TUBE or SILICON DIODE are still in place but here, when RECTO TUBE-TRACKING is selected in each Channel Strip, rectifier tubes are selected depending on the needs of each of the 5 power sections.This means that you can tune each of the Channels’ power feel to the preamp sound you are dialing. You might want CHANNEL 1running the DIODE with 4 x 6L6 for high headroom clean work while CHANNEL 2 runs TUBE-TRACKING with 2 x EL34 for a loose2x6L62x 2xEL34 4xEL34 6L62x2xEL+6L64x6L6PROGRESSIVELINKAGEDIODECH 4ATUBE-TRACKING BRECTO SPKRedgy roots rhythm sound. For the Lead Channels, you might want CHANNEL 3 VINTAGE pumping TUBE-TRACK-ING through the 2 x 6L6 + 2 x EL34 for smoldering single note solos and DIODE pushing 4 x 6L6 for the tightest ofCHANNEL 4 MODERN grinding crunch rhythm sounds. Countless choices are possible with the many differentcombinations and they all have their place for specific sounds. There are Front Panel LED indicators labeled RECTI-FIER STATUS that keep you currently informed of your Channel Specific choices of Rectifier style. Here is an explanationof how the two choices work;DIODE: calls up the silicon diode rectifier, which offers more punch, a tighter attack with more brightness andsubstantially more headroom. This rectifier choice provides the highest power and therefor the tightest rectification. This setting wouldbe best for any application where maximum headroom is needed or tight bass response is called for. Situations that usually requirethis are clean rhythm playing or extreme high gain crunch rhythm sounds.RECTO TUBE-TRACKING: takes a power section walk down memory lane, paying tribute to those vintage gems of yesteryear. Inthose early days of amplification the only rectifiers available were tubes. Unbeknownst to their creators, these sweet sounding amplifierswould someday become relics as the demand for higher volumes and more power per package led to the abandonment of thetube as a rectifier, in favor of the five cent silicon diodes’ greater efficiency. With this decision went much of the sweetness and souland by the late ‘60’s most amps were bold, loud and efficient…but unfortunately sometimes lacking that earlier soul. We sought to2x6L6PROGRESSIVELINKAGEODE ARACKINGCTOBSPKR2xEL+4x6L6CH 4A +B10% 90%LOOP 2MIXONONOFF OFFLOOP 1 LOOP 2bring that magic soul, personality and feel to the Dual Rectifier Series, and the resurrection of this age-oldcircuit does just that.In the Road King it was a little more of a challenge however, because each of the 5 power sections wouldrequire a different amountPAGE 22