Doppler Stereo Combo
Class AB push-pull 38 Watts KT66/EL34
Tube rectifier 5AR4/GZ34
Octal preamp tubes 6SL7 and 6SN7
External Bias adjust
Remote variable Speed pedal
Remote Reverb On/Off footswitch
Volume, Reverb Mix/Dwell, Voice,
Treble, Middle, Bass,
Fast and Slow speeds
Speed, Intensity, Master Left/Right
Sprague Vitamin Q paper/oil tone capacitors
Carbon composition resistors
Sprague ATOM TVA filters
Point to point terminal cloth wiring
NOS tube sockets
Powder coated Aluminum chassis 12 ga.
Tone Tubby Hempcone and Weber speakers
Handmade in USA
Solid pine cabinet construction
33.5" wide X 21" tall X 9 to 11.75" deep
Weight: 70 lbs.
Terminal point-point wiring is the same technique used by the military and in aviation construction for reliability.
Octal preamp tubes have a wider tonal spectrum and sound more relaxed and revealing with less compression than later 9 pin versions.
The transformerless Reverb design, provides extra rich harmonics and reflections.
The stacked control knob provides Mix and Dwell settings from no Reverb over subtle swells all the way to huge endless Reverb only.
Tone controls are highly interactive and the Voice control shifts the entire EQ from rich, fat, warm to bright, thin and edgy tonal ranges.
The Master Volume is true-bypass when turned all the way up.
With this asymmetrical frequency vibrato we can hear the full frequency spectrum and original quality of the signal without the phase-canceling signal loss of a typical symmetrical vibrato.
The Vibrato controls are a Fast and Slow speed switch, pulsing tempo LED, Intensity and Speed controls, creating a variable-speed stereo pitch-shift vibrato from subtle chorus to heavy pulsing vibe.
A remote Speed footpedal gives variable speed control with a Vibrato On/Off switch.
The asymmetrical frequency power amp separates the signal into upper and lower frequency ranges and plays them in stereo.
The KT66 power tube amplifies the lower half of the frequency range through the 15" speaker and the EL34 amplifies the upper half
through the 10" speaker. A stacked Master Volume knob has separate controls for the left and right side.
The custom output transformer has a special design, perfectly balancing KT66 and EL34 tubes while giving musical even-order harmonic break-up and an enhanced wide frequency range.
Both tubes have their own external bias adjust.
The 15" speaker is a Weber 15A200 - a Jensen Alnico P15LL woofer version as used in vintage Leslie rotating speaker cabinets.
The 10" speaker is the new Tone Tubby Silver Bullet Alnico hempcone.
An audiophile grade custom-made crossover with air core coils and paper/oil capacitors divides the speakers into their respective frequency ranges.
The warm laid-back omni-directional lower frequencies of the KT66 and slower 15" speaker provide the foundation and background
of the soundstage, with the brighter and lighter directional frequencies from the EL34 and faster 10" speaker floating on top
and into the foreground.
The stereo spread of frequencies let the ears experience a 3D effect with notes and harmonics continuously relocating in real time
depending on their pitch. This effect is enhanced when fingerpicking, giving an impression of two individual instruments playing.
The stereo imaging is further balanced with pickup selection on the guitar, EQ settings on the amp or a Wah pedal.
Playing full chords gives a sense of expanding dimension surrounding the player and listener with soundwaves from all angles
as they get reflected inside the room.
With increasing Vibrato and Reverb the sound turns into a phase modulating echo in 3D stereo, acquiring an organic-like liquid
sound character from slow motion chorus to jitter vibe.
An electric psychedelic experience induced by tubes and acoustical physics alone.
Input, Volume, Reverb Mix/Dwell, Voice, Treble, Middle, Bass, Fast/Slow, Speed, Intensity, Master Left/Right, Standby Switch, Power Switch
Illuminated control panel - click to enlarge
4 x 6SL7, 6SN7, KT66, EL34, 5AR4/GZ34
Vintage NOS and new production tubes. Ask for Premium Tube Upgrades for the ultimate tone experience!
Ceramic sockets with gold pins are available as a custom option.
60 Watt version:
4 x 6SL7, 6SN7, 7027, 6550, solid-state rectifier
With Tone Tubby 15 SuperBoy and Tone Tubby 10 Red Alnico speakers
Custom options: Wide Gold Arrow Knobs, Steel reinforced raised Leather Alligator handle
Sound clips are in stereo with 15" speaker on the left and 10" speaker on the right.
These are raw tracks without editing or effects.
The guitar is the Suspense
For the 10" speaker microphone I upgraded a large diaphragm condenser tube mic with a Micro Tube, Neumann U47 replacement capsule and Jensen transformer plugged into the Simplex Mic Pre
The 15" speaker has a Shure SM57 into the Missing Link
Dreams - various guitar pickup and speed pedal settings in Slow speed mode with moderate Intensity and mild Reverb
Ripples - steady Fast speed with strong Intensity and moderate Reverb
Echoes - various guitar pickup and speed pedal settings in Slow speed mode with strong Intensity and Reverb
Rainy - steady Slow speed with mild Intensity and moderate Reverb
Gypsy - mild overdrive and steady Slow speed with moderate Intensity and Reverb