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Tube Works MosValve™ Real Tube Combo Amp RT 2100 with 2 x 12 cab This is one of my personal amps. As some know, I’ve had experience with several hundred amps, mostly refurbishing classics as they pass through the shop. This is one of 4 I’ve considered my own, part of my collection. The point being, I’ve tried most every amp made & this is a favorite, one of the best; and (until now) one of my few keepers. I’ve decided it’s time to scale back & find other homes for most of my gear. Designed & built by BK Butler, a pioneer in electronic design refinements which were incorporated into these amps. For an idea of the sound, Billy Gibbons of ZZ Top has several of these & used them on many hits. Also favored by Eric Johnson & Buck Dharma with Blue Oyster Cult. Highlights: Same renowned reverb as Fender, full-sized Accutronics® spring reverb, type 4 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. Two channel operation plus a foot-switchable "stack" function in Channel 1 gives versatility of 3 channels. FEATURES (from the manual) . 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 incorporating 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. • 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. • Special British-coned, USA assembled speakers or optional Celestions™ insure smooth classic response over the entire spectrum of guitar tonality and playing styles. • 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. • 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. • Rugged Ozite covered all-plywood enclosures for exceptionally long life and good acoustic isolation properties. NOTE: This amp is destined to become a classic. The following are reviews and comments from others familiar with these: *I sold several of these Tube Works amps when I worked in retail from 88 to 92. My favorite version is the 100 watt vertical 2x12 combo amp. It had 1(?) removable panel so that you could have one speaker closed back and one open backed. Really nice tone with a good clean channel and a very good drive channel. I wish id bought one for myself back then. *The Mosvalve 962 is arguably the most musical sounding power amp ever built. B.K. Butler designed, tested and built the Tubeworks line for tone and dependability. I used Tubeworks and Mosvalve exclusively for years. When B.K. Butler stopped producing this line I moved to Mesa Boogie. I still own a Mosvalve 962 that is like new. I use it as a studio reference amp. Everything else sounds sterile in comparison. I recently ran a Boss- ME 70 through the Mosvalve and it is incredibly warm and punchy. If you can find one grab it, you won't be disappointed. *i'd say they're really solid sounding-- no pun intended. that company really did make some great stuff. a friend of mine used a mosvalve power amp for quite a few years with a mesa studio, and a rocktron pre-- and i've had the same tube driver pedal for.. god.. on 12 years now. just never found anything that worked anywhere near as well for what i want-- and in fact-- a studio tech asked me about it once. i pulled the thing out for him and he said 'do you mind if i look inside this thing?' i said no.. we had some time.. so he pulled it apart and fished around. he said 'wow-- what a NICE piece of gear this is!' he used to be one of the higher up technicians for hewlett packard europe before he moved to chicago. i took that as pretty high praise *This is the best sounding hybrid amp out there. If you want the tube sound without the tube headaches, this is the amp! *Well as you know I have a lot of Tube Works experience and have two MosValve power amps and a ProValve power amp. David and I were talking about this one. I haven't seen one before but pretty much know what it’s about just going on Butler’s designs. I don't use Tube Works pre amps which this has so I can tell you what I know. I don't like 10" speaker cabs, I know they are punchy but I think they work better for a bass cab. JMO. The power amp will have power amp tubes and a Mos circuit for the clean channel. I love their SS MosValve power amps because they are transparent. All you get is pre amp tube saturation and I like that in my set up. I use 2 in parallel. The nice thing with the ProValve power amp is the built in attenuator. I run my 2 channels as stereo. I have a feeling that's why that amp allows you to run both channels at the same time. Since my pre amp is so massively over driven the power amps are perfect for me. Their pre amps were not geared for big distortion but pedals can fix that. Butler sold Tube Works to Genz Benz years ago so the Butler models are cool. The later ones I like less.. It's a cool amp... I'd buy it just cause I collect em. One thing, their Power amps are loud as hell and if your speakers can handle it those amps can shake your house at half volume... Well mine are 110 watters but 60 is plenty. Butler overbuilt too so that's going to be a heavy bitch... You will probably never see another. Kills me to miss it.. *Characteristics – (One will likely notice this is from a friend whose native language is French) This is a 2-channel amplifier and a half, developed by BK Butler. The combo takes first channel circuit pedal BK Butler Chandler Tube '70s. The second channel simply reproduces the real tube overdrive pedal by tubeworks. On the second channel, are possible to add the "stack", which is a clipping diode providing grain heavier distortion and more acute. These two channels arrive on a floor "solid state" is meant in MOSFET reproducing a power stage lamps, famuex mosvalve. Power 100W is announced. But this amp can send more than some competitors 100W. A spring reverb is intéfrée directly into the amp behind the membranes. Connectivity point of view, there is a parallel effects loop with a trimming mix and levels out in a direct line level outputs and two speakers. It is possible to connect a pedal on a stereo plug to control more mono channels, the "stack" and reverb. Utilization Setup is simple because that is the most common. The clean channel is easy to pay. Channel 2 requires more delicacy. The "stack" gives many voices at once! Attention to the ears and at for group play. The manual is simple but adequate. It is possible to control the electronic diagram in genzbenz, which bought the brand 15 years ago. Sounds This is an amp of blues, rock and hard rock. For metal, pedal will be required. But in his chosen field, this is the class. Channel 1 has a crunch that is strongly reminiscent of Fender Blackface. Channel 2 rather shady side amps English, with lots of mids. The "stack", the sound is more open, but the grain is harder. I love this amp for channel 1 and sticking to crunch wish. Noise level is high, which makes for some nice neighbors, or when lowering the master, but you lose sound presence. Overall Opinion I have nearly 20 years. I tried other amps the same day. But he has earned by his tone and powerful sound, what I wanted at the time. A little too loud to play now flat. FYI, the photo is the 2x12 version, "that I have. *well, let's be clear, this is a 90's amp and has a bit of that vibe... that said, it's surprisingly versatile.... the preamp stage is switchable between fet and tube operation.... fet side is pretty crisp, the tube side is surprisingly dependent on the valve in the system. The big thing I like about this head is the blendable effects loop, not too common... Lots of good stuff you can do with that (you can run another preamp in and blend them for xtra goodness. - 1 - Model RT-2100 MosValve™ Real Tube Combo Amp OWNER’S MANUAL Congratulations on purchasing the most innovative, unique and best performing combo amp in existence. With world renowned and patented MosValve circuitry for power coupled with a "new design" 4-stage TUBE front-end preamp, your new combo is truly a major advance in the art of guitar sound production. Please take some time to fully familiarize yourself with the many design features of this amp. It far exceeds the limits of comparably-priced conventional equipment. FEATURES . 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 incorporating 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. • 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. • Special British-coned, USA assembled speakers or optional Celestions™ insure smooth classic response over the entire spectrum of guitar tonality and playing styles. • 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. • 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. • Rugged Ozite covered all-plywood enclosures for exceptionally long life and good acoustic isolation properties. NOTE: This amp is destined to become a classic. Take a few minutes to read the rest of the information. Again, accept our thanks and appreciation for your purchase. - 2 - FRONT PANEL FEATURES (left to right) 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 extra high output pickups. NOTE: Inputs have true active summing, therefore two guitars of any impedance may be summed together byusing 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 knowledgeable 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 separate 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 3.5 KHZ (upper shelving) MID 800 HZ (center) LO 150 HZ (lower shelving) 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 configuration. 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 tothe Channel 2 EQ section round in the Tube Works 922/924 Rack-Mounts. Warmth and tone are the key emphasis for this EQ. NOTE: Frequencies: Hi 3.5 KHZ (upper shelving) MID 800 HZ (center) LO 150 HZ (lower shelving) 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. - 3 - REAR PANEL FEATURES (left to right) AC CORD — Your amp is either wired for 120 VAC or 220-240 VAC. It is possible to rewire for either voltage. Contact factory for directions. WARNING!! Only a qualified technician should ever attempt this or any other service requiring the chassis to be removed from the cabinet! FUSE — Use fast-blo 4 Amp for 120 VAC or fast-blo 2 Amp for 220- 240 VAC. SPEAKERS — Output for speakers. Be sure not to load the amplifier with less than 4 ohms minimum impedance. Operation with less than 4 ohms will eventually cause failure due to overheating. VENT SLOTS — It is imperative that this amp receives adequate ventilation. Your MosValve power section normally produces more heat than typical solid-state circuits. Treat your investment right — LET IT BREATHE! EFFECTS LOOP — This system provides ultimate flexibility and control for your effects, regardless of type. See the section entitled. "How to properly use the Effects Loop" for further description. FOOTSWITCH — The two footswitch jacks are provided for switching Channel, Reverb and Stack. Jack #1 is for Reverb and Channel switching. Jack #2 is for Stack and Channel switching. The footswitch supplied will switch either combination of these functions depending on which jack is used. We decided to offer a 2-switch footswitch and stick with a common stereo 1/4” jack rather than going to a less common connector and a 3-switch footswitch. This was for three reasons. First, a 3-button footswitch is more confusing to use on-stage than 2. Second, many musicians leave reverb on all the time and the footswitch function is not as important to them anyway. Third, we would have to raise our retail price in order to produce a 3-switch footswitch. The increase in cost would be more than you would pay for a single footswitch at your dealer. If you find that you must switch all 3 functions, here's how to do it: 1. Plug the Tube Works footswitch into jack #1. 2. Obtain a regular push-on, push-off footswitch with a 1/4” plug and plug into jack #2. You will now have Reverb/Channel on the Tube Works footswitch, and Stack on the single footswitch.

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