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Steelphon S900

Monophonic synthesizer (1970?)

Synthesizer

"Made in North Italy Torino a quite limited, but rare, analog monophonic synthesizer with some presets. The S900 is a strange weird metal-plated synth in both wood or yellow design, often compared to a poor'man Musonic/ moog Sonic V.  "

 Main Data 

S900

Company: Steelphon 
Country: Italy
Weight: 10 Kg
Dimensions: / mm
trend price : 1000-2000€

Keyboard: 37 keys
Dates: 197X
Display: none
Synthesis: analog sub
Polyphony: 1 voice
Multitimbric: 1 part
Oscillator: 2 VCO
Waveform: saw / sin
Noise generator: yes
Filter: Digital Low pass
LFO: 1 modulator
Envelope: 2 EGs
Memory: 6 presets
Midi: none
CV: 1V/oc





Synthesizer 3 octaves C-C 37 keys
For some weird reasons there's no wheel for modulation

Back panel terminal connectors:
- Main signal out + headphones
- CV input VCO1
- CV input VCO2
- Input trigger
- Sustain input
- VCF CV IN
- VCA CV IN 

Nothing... yet!


Have some sounds or demo  want to share? 

- No manual 
- No service manual

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 In details 

Steelphon



 OSCILLATOR 2  X OSC VCO1 (sawtooth) + VCO2 (sinewave) with 5 sliders for mixing different footage + a separate noise generator (white or red) with own volume gain. 


2 VCO oscillators

- octaves: 32’, 16’, 8’, 4’, 2’ feet
- Beat Frequency at+/- 7Hz
- VCO2 can be detuned

MIX

- volume gain setting for VCO1 / VCO2 / Noise 

Generator

-white or red noise generator

Steelphon

LFO / EG / FILTER

Filter

FILTER 

powerful analog low pass with emphasis resonance

LFo

LFO

 1 modulator with very high frequency pot and 4 shapes.

- LFO 1 to pitch
- LFO 1 to filter

Envelope

Envelope

2 EGs each with 4 slider segments:

- EG 1: VCA
- EG 2: VCF 

S900 Performance

209 PCM

A very uncommon feature for the time: 6 memory presets!


41,7 kHz rate

not much, else  really! it is also quite odd, but there's not modulation nor bending option.

Performance

Our Verdict 

" Nice bulky Italo stuff. Vintage with gritty dirty sound. Maybe a bit overpriced by Ebay- for collectors"

Sound 
quality

Interface

Build
 quality

Rarity

Quality / 
price

Overall

CONS

-  limited
- expensive
- may need overhaul

PROS

-rare
- old analog
-Italian stuff

Are you a S900  fan? how do you use it? You do not agree with our review?  Let us know in the comment field just below 

DISQUS COMMENTS WILL BE SHOWN ONLY WHEN YOUR SITE IS ONLINE

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S-900 RELATED FAMILY + gallery

Steelphon  Audio Demo

 Video demo

Steelphon S900 Steelphon S900
80 out of 100 based on 1 user ratings
800 to 1500 from 1 sellers Sellers: