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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

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

Venus is a real tube overdrive inspired by one of the greatest masterpieces of the pedal museum.

With ultimate versatility and tone shaping in mind, we set out to recreate a classic tube tone sculpture with modern refinements, generating anything from a smooth, light tube overdrive, to a high-gain, nasty distortion within the realm of fuzz.

First of all, size matters! Without sacrificing tone, we squeezed our circuit into the smallest possible enclosure, measuring 12.6 x 6.6 x 5.7 cm (L x W x H). Instead of an internal step-down power transformer, we designed Venus to operate from a standard 9V DC power supply to minimize background noise and hum. The user can operate the pedal from the included power supply or any isolated 9V DC, center-negative power supply output with 500mA current capability. Then a properly designed internal voltage booster/inverter circuit provides the correct voltage conditions (symmetrical +/- 15V DC).

While the classic masterpiece that inspired Venus originally shipped with an ECC83 (12AX7) dual triode tube, users looking for a smoother, cleaner sound replaced the tube with a lower gain/higher headroom variant like ECC81 (12AT7) or ECC82 (12AU7). With that in mind, we selected an ECC832 tube as stock for Venus. This kind of oddball tube features half of an ECC83 and half of an ECC82. The tone is as close as possible to the original “tube sculpture” but with more clarity, string separation and a wider soundstage.

You can still substitute with all the "usual suspects" of dual triode tube types like ECC83/12AX7, 5751, ECC81/12AT7, 12AY7, ECC82/12AU7 for a different sonic flavor. Use the bias knob to set the tube bias/control the current passing through the tube cathodes. By adjusting this knob, you can find the sweet spot for different tube types used and/or set the texture of the overdrive / distortion: from gnarly, nasty and gated (counter-clockwise) to smooth and creamy (clockwise). The full clockwise setting of the bias knob has the cleanest sound for most tube types used.

A full 3-band EQ gives you total control over frequency response. With the mid control, you can sweep through the sounds of all the variants of the unit that inspired Venus and also comes in especially handy if you are using slightly mid-scooped clean amps. To sculpt the tone further and match the pedal to different guitars and/or pickups, we have also added a push switch to set the amount of low and low-mid frequencies boost that hits the tube gain stages between the stock fat or tight sound (when pushed in). A switchable low-output-impedance line driver (buffer/volume booster) ensures that your signal gets properly pushed through to the next pedal or your amp, and all your audio frequencies are retained. The bypass state of Venus is always true bypass regardless of this push button switch setting. The selectable line driver is only placed at the output of the effect when engaged.