3-D Analog Stereo Reverb

London Power's 3-D analog reverbs use linear circuitry only - no digital - so signal purity is retained and even the smallest signals are handled gently. 3-D is offered as hybrid tube + solid-state circuitry or as solid-state, always using a full-length Accutronics delay line at its heart. We offer it in four new forms:

3-D T   Stereo Analog Reverb System, tube drive and recovery, without routing LEDs  $2,430 CDN, approx. $1,800 USD
3-D TL - Stereo Analog Reverb System, tube drive and recovery, with routing LEDs  $2,430 CND, approx. $1,800 USD
3-D S -   Stereo Analog Reverb System, solid-state drive and recovery, without routing LEDs  $2,010 CND, approx. $1,495 USD
3-D SL - Stereo Analog Reverb System, solid-state drive and recovery, with routing LEDs  $2,010 CND, approx. $1,495 USD

London Power Analog Stereo Reverb Unit

London Power's 3-D tube reverb is legendary in its warmth and clarity. Today's 3-D offers this same quality with modern connectivity, now in a smaller package of just 1U. Our proprietary push-pull reverb driver produces warm tube tone but with much greater clarity and lower noise than traditional tube drivers. Recovery of the reverb sound from the full-length Accutronics delay line is all-tube.

tube 3-D uses one each of 12AT7 and 12AX7, or equivalent
tube 3-D proprietary push-pull tube driver and low-noise recovery
solid-state 3-D as drive and recovery voiced for natural warmth
can be set for 'reverb-only' output
unity gain and unity-phase from input to output
line-level or instrument-level
pristine sound for hifi, broadcast or theatre sound
regulated voltages
RCA phono plugs for input and output
low-noise input and mixing circuitry
impedance-matched ground-compensated TRS 1/4" output jacks
available with or without panel LEDs for routing functions
remote reverb mute
1U  3.4kg,h 17"W x 1.7"H x 6.5" D (plus tubes)
120V, 240V range switch
rack-mountable with optional kit

3-D T & 3-D TL use London Power's proprietary push-pull reverb driver and custom transformers to drive a full-length Accutronics delay line with a warm but pristine signal, recovered through multiple tube stages to produce a lush ambience that sounds very natural.  For those who want an analog reverb but without tubes, we offer an all-solid-state version that is voiced for a wam, clear, natural sounding reverb tone. The solid-state 3-D variants are called 3-D S & 3-D SL. The tube and solid-state 3-D have the same controls and inputs and outputs, so the description that follows applies to all 3-Ds.

Signal level going to and from the delay line is controlled by Depth and Reverb respectively.

London Power 3-D Reverb - RearThe routing switches allow many combinations of acoustic treatment. The input signals A & B can be routed to their respective outputs and/or to the reverberation block. The ambient signal can be sent to either output or both outputs. This capability allows one to set the outputs to be ambient information only, which if sent to surround amplifiers and speakers in a multi-way system can provide a very realistic room reverb effect. With reverb mixed into both main outputs along with the "dry" input signals, reverberation will sound as it should, with right-channel sounds echoed on the left and vice versa. The signal is handled by gold-plated relay contacts for absolute fidelity.

The reverb sound can be muted using a front-panel switch or via remote foot switch (not included).

In a home stereo or hifi sytem, 3-D is transparent to the main signal path, adding only the ambient sound. Signal phase and level are unchanged. RCA phono connections facilitate the usual unbalanced wiring of such systems, and for semi-pro studio use. TRS 1/4" jacks provide ground-compensated and impedance-matched output drive, eliminating ground loops.

A version of 3-D with no routing LEDs is available for a "stealthier" look in a home theatre equipment stand.

3-D can be used at instrument signal levels (-20dB). A gain boost for the reverb drive is provided, labelled 20dB. This assures there will be ample reverb effect even with low-level input signals.

3-D incorporates all of London Power's standard design and construction features:

toroidal power transformers
worldwide mains compatability
fusing for all transformer windings
Galactic Grounding
active hum filtering
long-life capacitors
low noise metal-film resistors
metal-oxide and wire-wound power resistors
zero wiring except for the delay-line fly-leads
zero standby power when switched 'off'

3-D can be rack mounted using the optional 1U6-BRKT, sold as pairs.

 "The reverb sound is beautiful... really natural..."

"This is the best tube reverb I've heard in a long time"

For our price list, see Studio Gear Ordering.


Photo Gallery:

London Power 3-D Reverb





London Power 3-D Rear - Solid State version


About London Power

London Power was founded in 1990 by Kevin O'Connor, after two decades of research into innovative audio amplification techniques. Kevin is an audio designer, author and speaker, known for his proprietary methodology called Power Scaling, and for his eleven books on audio subjects. Whether you seek amps, kits or information, you'll find useful answers here on not just the "how" but the "why" of audio amplifier design. Please enjoy the information on this site, and don't hesitate to contact us with questions.

Contact Us

(807) 473-0952
11 am - 6 pm, M-F
PO Box 10012, Thunder Bay, ON P7B 6T6 CANADA