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This ad is for 2 items sold together. 

Original boxes and original packing material are included

Shipped double boxed and packed very well.

Each item will be packed and shipped separately at the same time and manner.


As far as I know, all of the original owners manuals have been lost to the ages, and none can be bought. A printed PDF copy for each will be provided.

Shipping will be at your discretion

Please discuss pricing and offers in private messages(PM)

If you don't know, ask me. I am happy to help


Description of the service work completed by The Soundsmith Corporation on June 2015

Sumo Andromeda serial#: clean chassis of dust & dirt; locate & repair fatigued, cracked or overheated solder joints; rebuild main power supply with upgraded parts; replace intermittent RCA jacks with upgraded parts; adjust bias & test for thermal stability; check DC offset; Power, THD, mechanical integrity, & reliability test performed, 1 tamper proof label affixed. 8 hours labor charged

Completed rebuild cost from invoice $1021.20


Sumo Electra serial #: clean chassis of dust & dirt, replace defective pre-out and tape in/out RCA jack assemlies, replace all electrolytic capacitors with upgraded parts, locate & repair fatigued, cracked or overheated solder joints, replace burned/out of spec components, test all inputs, reliability test performed, 1 tamper proof label affixed. 6 hours labor charged

Completed rebuild cost from invoice $813.50


Total service cost including shipping $1939.70


Link to the Oct. 2nd 1982 Sumo Andromeda review https://www.stereophile.com/solidpoweramps/sumo_andromeda_power_amplifier/index.html

Link to the video report on Soundsmith by Stereophile https://www.stereophile.com/content/soundsmiths-peter-ledermann-building-mastering-and-giving-back

and HERE


Designed by James Bongiorno who's long and storied career spans two entirely distinct eras, from Hadley, Dynaco, Marantz, and SAE in the 1960s, to Constellation Audio in the second decade of the 21st century. Bongiorno designed amplifiers in six different decades, working alongside other industry legends such as Richard Sequerra, Sidney Smith, David Hafler, Morris Kessler, John Curl, and Bascom King. Bongiorno will best be remembered for Great American Sound (GAS), the company he founded in 1974 after leaving SAE. The GAS Ampzilla power amplifier was an instant classic, outperforming many much more expensive amplifiers and sending ripples through the industry. Bongiorno was eventually forced out and the company folded a few years later. He quickly founded a new company, Sumo Electric Company, Ltd., to bring his circuits to moderately priced products. As with GAS, disputes between business partners led to Sumo’s premature demise.



Sumo's class AB Andromeda has a full wave, four quadrant balanced topology exercising total control over any loudspeaker connected to it, regardless of load type. 

It's four independent push-pull feedback loops maintain your speakers in absolute phase with the musical signal, resulting in perfect imaging and a wide soundstage.  

Andromeda achieves its astonishing accuracy through a combination of high power output - 200 watts per channel into 8 ohms and up to 350 watts into 4 ohms, and a complete lack of current limiting.  

Rather than introduce invasive circuitry to protect the amplifier, which leads to restricted dynamic range and increased distortion, Sumo engineers put extremely wideband, extra high dissipation power transistors at the output.  

The dynamic range and awesome deep bass response of Andromeda was unapproached by any other amplifier of its time.


Power output in watts RMS per channel 2 channels driven 20khz-20khz @8Ω 200Watts @THD<0.05%

Power output in watts RMS per channel 2 channels driven 20khz-20khz @4Ω 350Watts @THD<0.1%

Damping factor: 300 from 20Hz-1Khz

Input sensitivity: 1.8V

Input impedance 100K Ohms 

Signal to noise ratio: 100dB

Dimensions: 19" x 8.75" x 7"

Weight: 35 lbs.

Original MSRP $899

Manual available upon request


Everything about Electra's design underlines Sumo engineering's fanatic attention to detail.

While other preamps give you volume controls, Electra provides laser-trimmed stepped attenuators for volume, bass treble and balance.

These controls will pass high frequency square waves with no apparent distortion, and offer near-perfect channel to channel tracking.

1% metal film resistors are used throughout the signal path.

The phono preamp stage for moving coil cartridges is both fully complementary and DC coupled, as is the FET magnetic phono stage.

The entire preamplifier remains in phase from input to output.

Even the circuit topology has been configured to reject stray magnetic fields, which can introduce hum and noise into the system.

When Electra is used with other Sumo equipment, such as the Andromeda, the interaction is synergistic. The whole is greater than the parts.

You will hear a wide, accurate soundstage, incredible dynamic range, astounding definition throughout the audio band.

In short, the natural, effortless purity of live music.


Frequency response: 2Hz to 100kHz +/-3db 20Hz-20Khz +/-0.1db

Low filter (Quasi-2nd order) 20Hz -3db

Total harmonic distortion: 0.01%

Gain @1KHz: 

68dB (MC), SNR 65db

42dB (MM), SNR 70db

20dB (Tuner, Aux, Tape), SNR 100db

Input sensitivity 3V RMS-1KHz: 0.115mV (MC), 2.3mV (MM), 315mV (line)

Crosstalk @20KHz -60db, @below 1KHz -80db 

Dimensions: 19" x 3.5" x 9"

Weight: 12lbs.

Manual available upon request

More literature, links, downloads, etc. available upon request














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Those two WILL do it all.  Leaving no stone un-turned.  Heard both years ago and they were super impressive.   GLWS  

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Probably going to move this to the auction site soon. Getting lots of good will, but no offers. Willing to split, but not sure why anyone would. Make me an offer, I won't bite. I just cannot sell these for the scrap metal prices I see the unrestored 40 year old examples sell for.

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You have until Sunday to decide before I pull the add sell the Sumo's on Ebay.

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Final Hours and the Sumo Andromeda and Sumo Electra will be gone. Send your best offer now.

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