Juke Coda 112 BACKGROUND / HISTORY

Warbler The original idea was to incorporate features from my favorite amps and call it the Warbler (1989). The design yielded an amp with qualities unlike any amp that I had heard or owned and ended my twenty five year quest for the elusive magic amp. I began to study my creation, researching the circuitry of the amps that influenced its conception. It became apparent that my off beat design subtly colored harmonic content as a function of frequency, producing a transparent ambient flavor that seemed unaffected by component choices and circuit arrangement. This essentially opened the door to formulating an amp strategy and sparked a synchronistic process which lead to developing and building the Juke in 1995, a remarkable piece of equipment that has exceeded all my egocentric expectations.

G. R. Croteau Graduate: Trivia NH Technical Institute Amps that influenced the Warbler design: Electronic Engineering Ampeg - Reverborocket R-12-R Concord, NH 1966 - Tweed Falcon and GA-30RVT and Fender - 5E4 Super Amp, Princeton Reverb Institute of Audio Research Magnatone - Troubadour 213-A and MP13-A Recording Engineering Valco - (several) , , Harmony New York, NY 1973 and Airline models Amps: Tube audio hobbyist 1958-66 warbler Tube electronic repairs since 1966 (wôr' blõr) n. music. a singer; one that warbles; Specializing in Musical Electronics to sing with trills, quavers, Service and Repair or melodic embellishments Full Vintage Restorations muse 1988-Present (myáz) n. a source of inspiration; guiding spirit Building Amps Since 1989 juke Musician: (ják) Southeastern U.S. n. musical happening; Trombone 1956-62 a roadhouse with music for dancing Harmonica 1962-Present intr.v. To dance, especially in a roadhouse Vocalist 1958-Present or to the music of a jukebox

Magnatone + Gibson + Valco + Ampeg + Fender = JUKE Juke amplifiers reflect the fundamental concepts and aesthetics of vacuum tube amps built by the five major American manufacturers in the late 50's and early 60's. Its compilation design provides uncanny musical responsiveness, unique tone coloration, and unusual effects. The Juke is the only amp with a interactive array of classic Ampeg, Gibson and Fender type equalization for the ultimate tone tailoring, three output modes of operation and a *Tri-Cone Speaker System. The Juke is the only amp that uses varistor modulators to produce the fabulous Magnatone pitch shifting vibrato. Plus, Valco bias modulated tremolo which can be mixed for a true vibrato experience. The Juke is the only amp that side bands the classic Ampeg type C reverb and uses a Magnatone recovery circuit, producing a spacious event with a decay that always hangs behind the notes. The Juke is all things not typical or available elsewhere. Its sensitivity, ambient clarity and dimensional tonality will reveal the subtle nuances of one’s technique and is ideal for all styles of music including acoustic. At home in the livingroom, studio or on stage, it beckons to be played. The Vintage / Boutique Recipe For A Feast Of Musical Flavors !

Disclaimer: Warbler Muse / Juke Amplification has no affiliation with Ampeg, Fender and Gibson which are Registered Trade Names of Ampeg, St Louis Music, Fender Musical Instruments and Gibson Musical Instruments.

* Juke 1210 & Juke 810 Models - WORKMANSHIP -

The Juke is a hand built* product ascribing to time tested formulas. The cabinet, hand wired chassis and point to point board echoes the classic style of the tweed era, and the materials and components were chosen to provide durability and long term availability, rather than exotic qualities required for high price marketing ploys.

- POLICY -

Production is limited to one amp per week Prepaid orders have pirority. No custom varations of standard production amps. No freebies for endorsements !

- WARRANTY -

JUKE AMPLIFIERS HAVE A LIMITED LIFETIME WARRANTY WHICH IS FULLY TRANSFERABLE** AND GUARANTEED AGAINST DEFECTS IN WORKMANSHIP, INCLUDING ELECTRONICS AND CABINETRY.

This warranty does not apply if the product has been damaged by accident, electrical fault, through misuse or abuse. Alteration voids this warranty. Manufactures warrant apply to all electronic components. **Ownership transfers must be verifier via sale receipt. Used amp purchased for less than 70% of Retail List, do not qualify ! Shipping to and from Juke Amplification is the responsibility of the purchaser.

*Juke Amps is a one man operation, all aspects of amp manufacturing; purchasing, electronics assembly & wiring, cabinet construction & tolexing, covers, literature, graphics and web site. Coda 112 5881’s or 6L6’s / Class AB / Switchable Bias Pentode / Triode Output Modes "Golden Voice" Pitch Shifting Vibrato & Bias Modulated Tremelo "Concert Hall" Sideband Type C Spring Reverb Jensen Tornado Speakers Designed for , this model has the classic voices typical of the vintage amps associated with the roots of the Warbler design. Great for small venues and studio work !

Colors - Purple - Green - Brown - Red Grill Cloth - Tan/Black Cane Piping, Handle & Corners - Black Reverb-Vibrato Footswitch VOICING & EFFECTS

Pre-Amp Inputs : Hi Z - 1Meg / Lo Z - 100k Level : Pre-Amp Gain Contour : Midrange-Hz [Cut / Boost] Bass : Lo-Hz [Cut / Boost] Treble : Hz [Cut / Boost] Volume : Master Volume

Modulator AM-Depth : Amplitude Modulation [Tremolo] FM-Width : Frequency Modulation [Pitch-Shift] Speed : Rate of Lo-Hz Modulation

Reverb Dwell : Drive Level to Spring Reverb Unit Color : Tone [Dark / Bright] Depth : Mix Level

Power Amp Fixed Bias Triode: 10W RMS /16 W Max Pentode: 30 W RMS /36W Max Cathode Bias Triode: 7W RMS /12 W Max Pentode: 20W RMS /26W Max Footswitch Reverb - Vibrato : On / Off GENERAL INFO

1 - The Juke is a single channel vintage tube amplifier design. 2 - Low output pick-ups may require a pre-amp. 3 - The Juke does not have a Distortion mode! 4 - External pedals should be used discreetly. 5 - The Juke’s transparent tonality will effortlessly cut thru any mix, but may seem a bit thin on stage due to the phase relationships of the harmonic coloration. 6 - To maintain the amps musical qualities and signal to noise ratio, Level and Volume controls should not exceed a 4 o’clock setting to minimize noise. 7 - Voicing controls are center orientated (12 o’clock) and should be adjusted in small increments when EQing the amp.

SET - UP SUGGESTION

A - Set instrument volume and tone at 50%. B - Adjust contour, tone and pre-amp level. C - Adjust treble, bass, volume and presence. D - For a cleaner tone set volume at 3-4 o’clock E - Add effects (Reverb and Vibrato).

UNDER CHASSIS SWITCHES Left to Right Fixed Bias - Out / Cathode Bias - In & Pentode - Out / Triode - In

MAINTENANCE Like all tube amplifiers the Juke requires simple retubing from time to time. Below is a chart of tube location and tube types. The Juke was designed to use the common tubes manufactured today. High priced NOS tubes will not improve the Jukes over all performance. High Grade tested for noise and hum by Ruby, ARS or Grove Tubes should be used. The following list of tube are what I recommend (from right to left ). 1, 3 & 4 - 12AX7A JJ Tesla Low Noise 2 - ECC802 /12AU7 - JJ Tesla (large plate version) 5 - ECC832 /12DW7A JJ Tesla 3 + 5 - 12AX7A Tesla (large plate version) 6 + 7 Tung Sol 5881’s or 6L6’s 8 - 5AR4 Sovtek

POWER TUBE REBIASING Fixed Bias Version I typically run tubes at 70 - 75 % of rated bottle wattage this translates to around .044ma / tube Remove back panels, installed new tubes, set output switch to triode, then locate trimmer pot and large 10 ohm power resistor at left end of circuit board. Connect DC voltage meter across the 10 ohm resistor. Adjust trimmer pot so voltage across the 10 ohm resistor is 0.88v for 5881 or 6L6’s. Replace back panel.

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Session : Date : Warbler Muse Box 264 Troy, NH 03465 603-242-6478 www.jukeamps.com [email protected]