The Tube Works Mosvalve RT-2100R Rack Mount Amp Head by BK Butler Audio 100 Watts of Power. Real tube reverb. Fantastic clean and overdrive tones. High quality US made Amp. Continuous anti-feedback circuitry eliminates over 60% of the typical “squeal" or HF screech apparent in many amps. This allows higher volume levels at closer proximity to the cabinet, as well as a much "fatter" sound in close quarters. 4-Stage TUBE preamp section. Tubes are individually hand and ear-checked for low microphonics and hum. We reject over 50% of the tubes we receive from our suppliers. DC filament operation of preamp tubes to eliminate the common tube hum caused by conventional (and cheaper) AC designs. Lower plate voltages insure greatly extended tube life. BK Butler is the pioneer of low-voltage designs for vacuum tubes. Tubes typically will not have to be replaced for 2-3 years under normal conditions. Continuous anti-feedback circuitry eliminates over 60% of the typical “squeal" or HF screech apparent in many amps. This allows higher volume levels at closer proximity to the cabinet, as well as a much "fatter" sound in close quarters. Two channel operation plus a foot-switchable "stack" function in Channel 1 gives versatility of 3 channels Separate EQ sections for each channel. Channel 1 features a radically expanded range for overdrive incor-porating true active response with passive musical tonality. MosValve power section. Identical to a single channel of our famous "RT-962" rack-mount MosValve power amplifier. Since its introduction MosValve has become the new standard of musicality by which all other amps beg to be judged. Front panel "Mix" control allows mixing of processed signal ("wet") from the input of the effects loop and the original ("dry") pre-effect signal. This type of signal mixing is usually done via an outboard mixing console and adds dramatically to the flexibility of effects use. Variable send-receive effects loop. Easily adjusts to virtually any signal level of floor or rack-mount device on the market regardless of input/output impedance. MosValve powered full-sized Accutronics® spring reverb system actually driven by a separate onboard 15 watt MosValve power amp. This reverb system is the closest thing to the classic Fender™ style reverbs from the past and utilizes the same specs and reverb tank. CHANNEL SWITCH — Selects either Drive (Red LED) or, Clean (Green LED) channels. Switch is bypassed and inoperative when footswitch plug is inserted into either, footswitch jack on the rear panel. INPUTS — Input 1: 0 dB. - Most sensitive input. Input 2: -8 dB. - Less sensitive input for Steel guitars and ex- tra-high output pickups. NOTE: Inputs have true active summing, therefore two guitars of any impedance may be summed together by using both inputs. It is also possible to use a "Y" cord to give even more gain. (Single guitar Y-ed into the two inputs). DRIVE CONTROL — Controls gain of tube #1. Tube #1 is biased for a thinner, articulate Tube Driver-like tone reminiscent of British amps. At control settings lower than 3, tube #1 becomes virtually clean allowing the Stack control to completely control the overdrive level through tube #2. STACK CONTROL — Controls gain of tube # 2. Tube #2 is biased in a more "Blue Tube" manner. Those knowl- edgeable with the famous Tube Works model 922 and 924 rack-mount will hear a lot of familiar tones as this control is added. As you add more "stack" the sound will become fatter and fatter. This is of great help when practicing at lower volume levels to maintain a well-balanced tone. NOTE. This control is switchable via the back-panel footswitch jack labeled "2". The footswitch will switch between the "0" setting to whatever level you preset the Stack control to. This adds 3rd channel capability to your amp. Hi, MID, LO — Drive channel EQ. This is an entirely new concept for combo amplifiers. Each control is a sepa- rate passive filter summed actively into the (also) active, Master volume. This configuration adds great flexibility and much expanded range over conventional passive designs and prevents any crosstalk into the clean channel when overdrive is switched off. Inter-control loading is greatly reduced as well. NOTE: Frequencies: Hi ALL HAVE PASSIVE ROLL-OFF CHARACTERISTICS. MASTER — Active master volume control for the Drive channel. No leakage of signal is present with this master at 0. This insures good definition at the ultra-high gain levels this preamp is capable of with its Stack configura- tion. VOLUME — Clean channel gain. This channel is also capable of classic overdrive with the use of its master control. MASTER — Master volume for Clean (Green) channel. HI, MID, LOW — Classic Tube Works passive EQ. This EQ is identical to the Channel 2 EQ section round in the Tube Works 922/924 Rack-Mounts. Warmth and tone are the key emphasis for this EQ. Frequencies: Hi ALL HAVE PASSIVE ROLL-OFF CHARACTERISTICS. EFFECTS MIX — This control mixes the signal present at the "Effects In" Jack on the rear panel. Rotating the control towards "Wet" mixes more and more of the effect's sound while "Dry" mixes more of the pre-effect signal. NOTE: This control functions ONLY when there is a plug inserted into the "Effects Return" jack. REVERB — Adds desired reverb intensity. Reverb is switchable when using Footswitch jack #1

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