Welson K.O. Keyboard Orchestra String Synth SN 182584

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via this Reverb listing

You can find demos and pics of the inside in previous posts here.

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SLM CONCERT SPECTRUM String Analog Synthesizer

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via this listing

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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rare birds: Welson Keyboard Orchestra (K.O.)

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video upload by ohm_studi_ohm

"I've seen many string synths and this one is still one of my favourite. It's one of the happy few string synths I keep. I have one always plugged in my studio and it's actually the one I use the most (along with the Arp Omni 2). It's not the lushest, not the smoothest, not the fatest one and yet there is something I'm particularly attracted to. I like the combination of the 2 strings sounds with the harpsichord one. And on the other hand I really like the piano sound, played alone. It's my favorite of all the electronic piano sound I could hear, except for the Farfisa Professional Piano that is the best electronic piano there is (and with dynamic !).
Design is very close to the Elka Rhapsody 610 but I definetly favor the sound of the Welson. Like the Rhapsody it only embeds a double chorus, and that explain why the sound is not as lush as other stringer that uses triple chorus (most of them). Still they sound very nice IMO."

via this listing

"Quite rare italian polyphonic keyboard with 4 sounds: cello, violin, piano and harpsichord.

Very simple design and yet very nice sounding. Check the demo I made.

You can mute evey section with its dedicated switch and you have control over individual volumes, as well as "sustain" for the string presets and "decay" for the keyboard presets.

Inside there is of course a BBD based chorus, using classic TCA350Y chipsets, like many famous string synth: Eminent Solina, Logan/Hohner String Melody, Elka Rhapsody etc

Like on the Elka Rhapsody it's only a double chorus, not a triple one, so string sound is not as lush as on the Solina or Logan. But these strings sounds very nice, better IMO then the Elka.

There are also seperate outputs for both sections. And furthermore the instrument is quite compact and leightweight (13.5 kilos) for a string synth, which makes a great live performer."

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Welson KO (Keyboard Orchestra) String Synthesizer

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via this auction

You can find a demo of one previously posted here.

"An amazing and very rare Italian string machine/keyboard from the late 1970's.

It has the ability to separately process the Violin and Viola sections from the Piano and Harpsichord sounds. I tend to put a chorus and reverb on the strings and a delay on the percussive sounds...for amazing results.

This keyboard is in excellent shape considering that it is 44 years old. I just cleaned all of the slider pots and the internal circuits. In gorgeous shape for a mid-aged instrument.

I recently replaced/repaired the slider for the string sections sustain control. I couldn't find an exact match, but did my best."

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The string machine ensemble effect: Dr. Böhm Phasing Rotor VS Wersi Wersivoice WV7

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video upload by Ohm. Studio



"The Wersi in the video is for sale. [listed on eBay here]

Here is a comparison between two very similar BBD triple choruses, AKA ensemble effect: The Dr. Böhm Phasing Rotor 79 (which I demoed extensively in a previous video with a Multivox MX-202, a Crumar Stringman and a Roland Jupiter 4) and the Wersivoice WV7. The Böhm has some more variations but the chorus sound (ie ensemble effect) is very similar. Circuit are almost 100% identical. I also own a Wersi Wersivoice FM76 which is the updated and standalone version of the Wersi WV7 and sound even closer to the Böhm.

I used a Welson Keyboard Orchestra to demo the two units. I made another video with the Wersivoice alone with a Sequential prophet 6 in order to show how easily you can turn any synthesizer into a string machine with these units."

via this auction

"Vintage analog triple chorus effect unit, based on 3x Philips TDA1022 Bucket Brigade Device chipset and of classic ARP Eminent Solina design. Turns anything into a great sounding string machine.

It offers Vibrato (slow and fast) and Chorus (the ensemble effect) with 3 variations of depth (« weak » and « strong » switch and both together).

It is almost the same circuit as the Dr. Böhm Phasing Rotor I also built, with less variations. But the ensemble effect does sound identical."

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Welson KO (keyboard orchestra) rare Italian string synth

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via this auction

Details, pics, and video at the auction and captured here.

Welson KO ( keyboard orchestra ) string synthesizer

Published on Jul 16, 2016 osbornesmith1

Volume gets louder at 1 minute mark.

"Welson KO ( keyboard orchestra )
This was recorded with no added effects.
It has two outputs, one for strings and one for piano & harpsichord.
Very rare Italian string synthesizer from the mid 1970's with a
beautiful analogue tone.
Made by Webo Electronics Co."

Update:

via eBay

"Checked over by James Walker of Synth Repair Services, Stoke on Trent.

It has two outputs. One for strings - violin and cello and one for percussion - piano and harpsichord.
This is really useful for splitting the sounds and running through a delay for example.
It has a beautiful mellow analogue sound and not as harsh as some Italian string machines of the era.
All sounds are fully polyphonic and can be played simultaneously.
It comes with custom made wooden shipping case."

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Keyboard Demo: WELSON- Keyboard Orchestra (K.O.) Vintage analogue

Published on Jan 14, 2014 MrSkywalker1000

"Demo Video from my very rare italian Vintage-Keyboard."