SLM Spectrum Electric Piano (Made in Italy) Cello, Violin, Harp, Piano

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"Very cool electric piano from the 1970s SLM Spectrum (Made in Italy) featuring a nice mix of Cello, Violin, Piano and Harpsichord. The lowest and highest note on the keyboard are not working on the Violin and Cello mode. Most of the slider caps on the mix controls are broken, you can however slide them easily with a press of the finger. Includes original stand as pictured."

You can find some pics of the inside posted here.

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SLM CONCERT SPECTRUM String Analog Synthesizer

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Pics of the inside below.

"This SLM Concert Spectrum string synthesizer keyboard was produced by Welson Synthesizer from 1975-76. Italian-made, stereo analog string/brass/piano synthesizer was made famous by Richard Tandy of The Electric Light Orchestra and Gregg Rolie of Journey.

The Concert Spectrum features:

61 keys (C2 - C7)

Split (between E4 and F4) that allows different sounds to be set for lower and higher keys

5 sound presets that can be layered (Cello, Violin, Horn&Trumpet, Piano, Harpsichord), with on/off buttons

10 volume sliders, 2 for each sound, setting the level of each preset in the total sound, 1 for each split section

4 decay sliders (actually: release sliders), 2 for the sustained section (Cello, Violin, Horn&Trumpet) (1 for each split section), 2 for the percussive section (Piano, Harpsichord) (1 for each split section)

Concert Effect

Stereo output (2 unbalanced mono jack outputs, with individual volume controls) on the back

2 connectors for optional volume pedals

Pitch (tuning) potentiometer

This synthesizer will need to be serviced to be fully functional. It powers on and produces a quiet sound for some of the sound presets but not all. The power cord has some fraying near the plug, and it will need repair as well. Pots and sliders have been scratchy when tested but not consistantly."

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SLM Pedal Bass Analog Bass Synthesizer 70s 1970s Vintage Keys

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"The keys all work, The black plastic shell part comes off easily and the pitch buttons are missing their caps but the shafts still activate when pushed. Im not an expert on this unit but it makes a thick bass sound"

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SLM Pedal Bass P-700 Analog Bass Synthesizer

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SLM Concert 1970s Vintage Strings and Keys

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"Concert SLM. Made popular by ELO’s Jeff Lynne. Sounds great! Phenomenal electric piano. Has some stickers on the body. Replaced power connector. All contacts work. Cello and Violin sounds are quiet but functional. One button cover missing. Several slider covers missing. Three broken fader tips, but can still be adjusted easily. Rare as they get.

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Vintage SLM P-700 Pedal Bass Analog Bass Synthesizer Made In Italy

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"Pedal is in good condition with some tape residue on front. Low noise etc, and even comes with the bag. Bag has seen better days as it’s made of vinyl, but still zips and holds the synth."

You can find demos in the archives here.

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Super Rare Vintage Synthesizer 1970s SLM Concert Spectrum Keyboard SN 153145

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You can find a demo of one here.


"This is a Concert Spectrum sold by ST. Louis Music.

These were only made and sold in 1975 and 1976.

These were intended for professional use and were used heavily by the likes of ELO and Journey in the studio and on stage in the mid to late 1970s.

Incredible vintage sounds and effects from this ahead of it's time keyboard.

Variety of voices and rally cool stereo and panning effects built in. You can conbine any of the voicings and it will let you pan certain voicings to different amps and cabs, you can even mix these voicings during playing. Incredibly innovative for the time.

The last couple of these keyboards sold for over $1000 on Reverb in comparable condition.

Some things to consider with this specific keyboard:

The top-side pannning sliders and buttons are a bit scratchy and could use some cleaning.

It is missing two volume slider knobs on the front of the keyboard. One of the sliders (the volume for the bass portion of the violin voice) has been broken off although the slider still works well and moves freely with your fingers, an easy fix for sure.

Five keys do not work with the "piano" and "harpsichord" voicings. These same keys work well with the other instrument voices. I think that most musicians will not be concered with this due to the fact that these are the two least desirable voices on this model. You really want this synth for it's wonderful vintage sounding "violin" and "cello" voices.

The 'decay' on one key is fairly short and doesn't respond to the adjustment setting. Almost impossible to discern when playing chords and solos.

This keyboard came with two metal "legs" that were used for a stand. These legs were missing when I acquired it. This keyboard is better suited for a multi tierd stand...It would look awesome with a vintage Moog sitting under it!"

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1977 SLM Concert Spectrum Vintage Analog String Synthesizer SN 1551

Note: Auction links are affiliate links for which the site may be compensated. SLM Concert Spectrum Stereo Analog String Brass Piano Harpsichord Synthesizer

Published on Apr 26, 2015 keyboard resource

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"Condition: Works good. Bottom-left corner is cracked. Includes metal legs and crossbar. The legs may be missing parts to keep it from tilting. I'm not sure as I've never seen a picture of the complete package. See pictures.

The SLM (St. Louis Music) Concert Spectrum is an extremely rare, stereo analog string/brass/piano synthesizer from the mid-1970's.

Famously used by Richard Tandy of The Electric Light Orchestra. It is mention in this excerpt from a December 1978 Keyboard magazine article: 'Richard's collection of onstage instruments consists of a Hohner Clavinet, a Polymoog, a Yamaha CS-80 synthesizer, a Mellotron (called "Old Faithful" by Tandy), a seven-foot Yamaha grand piano, and the Wutlitzer. In addition to these, the band carries several back-up keyboards - an extra Mellotron, two spare Wurtlizer electric pianos, a Minimoog, and an SLM Concert Spectrum string synthesizer - in case any of the front-line instruments malfunction.'"

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SLM Pedal Bass P-700 Analog Bass Synthesizer

Published on Jun 15, 2016 Busby Antiques

"SLM Pedal Bass P-700 Analog Bass Synthesizer

Selling at: http://www.ebay.com/usr/cabusby"

I couldn't find this one listed at the moment. I'll post back if I see it.

SLM P-700 Analog Pedal Bass Unit with Gig Bag

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Uploaded on Mar 16, 2016 jinjxmusic

"This is a (1973?) SLM Pedal Bass P 700 I have for sale on ebay. It's in amazing shape and sounds great. This does not have MIDI function, is a true synthesizer: plug into your amp/rig and play! No functional issues and all pedals work great and consistent"

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SLM Concert Spectrum

Published on Apr 26, 2015 keyboard resource

"Vintage Italian analog string synthesizer"

Note the bottom front panel is not colored like in this one. This is only the second post to feature the Concert Spectrum although there have been other SLM posts. See the SLM channel below.

SLM Pedal Bass Model P-700

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"Model P-700. It is identical to the Jen Pedal Bass and the Sound City Pedal Bass..."

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1970's SLM Spectrum Analog String Synthesizer

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"Most famouly used by E.L.O (Electric Light Orchestra), Italy's "SLM Spectrum" analog string synth.

This one has been serviced by Adventures in Analog in SW Washinton State and has been custom modified as a purely string synth with vintage looking wood panels.

Great alternative to the ARP SE-1 / Solina / String ensemble. Same great analog string synth sound, for a fraction of the price

Very little info on this synth and the company is available online. From what I understand it was made by the same company the Welson String Synth.

Obviously VERY RARE and sounds SUPER COOL!

Individual controls are:
Cello On/Off
Violin On/Off
Cello Volume
Violin Volume
Sustain & Decay Envelope
Stereo and Mono Outputs"

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SLM P-700 Pedal Bass Unit

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"Features

13 pedals
16' and 8' pitch buttons
Sustain knob with on/off button
Volume and Tone knobs
Tuning knob (on left side of unit)"

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The SLM Concert Spectrum Synthesizer

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"Up for sale is The SML Concert Spectrum Synthesizer. Its in working condition but needs some repair such as fuses and wires and such. It wont cost much. This is sold as is and no return. Please bid with confidence that you are getting a once in a lifetime Synthesizer from the 70`s. Also it was made in Italy."

Update via Micke in the comments: "That's a rebadged Welson symphony string synthesizer (1976). It was built by the company WEBO electronics in Passatempo, Italy. Best known users of the SLM version are Richard TAndy of E.L.O. and Gregg Rolie of Journey."

SLM Pedal Bass

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"vintage 1973 SLM synth pedal bass. This is a self contained synth bass, you play with your feet. One octave keyboard. Has three different sounds : 8 (higher pitch), 16 (lower pitch), and 8 +16 combined for a chorus effect. This is not a midi controller! it is a self contained Bass Synth! similar to a moog taurus.

Hard shell suitcase included.

Made by: SLM (saint louis music company)

year made: circa 1973"

SLM Pedal Bass Vintage Analog Synthesizer

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"Model P-700. It is identical to the Jen Pedal Bass and the Sound City Pedal Bass. You can get some information at this link.

Very cool and rare stand alone bass pedals. Hook it up to an amp and it's ready to go. This gets a cool low octave synth sound with certain settings. I'm pretty sure it's all analog."

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