"Since I just serviced a Promars for a friend of mine I decided to compare it to my JP4.
Both units are fully working, recapped and calibrated. And both are from latter revision with IR3109 filters. Basically they have same motherboard, module board and module control board.
First a quick impro taking advantages of what makes them different: Promars has a second VCO with 2 tuning settings so it can sounds thicker than the JP4, whereas the latter is of course polyphonic and has a builtin arpeggiator and stereo chorus effect.
They share the same CPU and 'compuphonic' technology and have (almost) the same presets.
You can hear when I compare both synths that the presets don't sound exactly the same but this is more a question of calibration and preset values then synth character.
Calibration method are different for the 2 synths and there are slight different adjutements, especially on the filter frequency, width, resonance and hi pass filter setting.
Also i'm quite sure the presets value are a bit different in the JP4 and Promars. Most obvious is the "voice" preset with is one octave higher on the JP4 ! And listening to other presets some a bit brighter on the Promars while other are brighter on the JP4.
But you can observe when I edit the JP4 presets that it's very easy to get the same sound from both unit.
They do get along quite well and their respective particular features make owning the two of them even more desirable."
Quick demo of a recently serviced and modded Jen Synthetone SX2000 italian mono synth.
CV/Gate and Fiter inputs were added, see the other video where I showcase the synth with external control. (
• Jen Synthetone SX... )
Recorded straight with no FX nor treatment.
The SX2000 is one of my favorite mono synth, I always had at least one in my setup. Just one oscillator but thaks to a ladder filter inspired by the EMS VCS3 it sounds very nice, it can be beasty and funky.
Very simple architecture but some nice features like both VCF and VCA enveloppes can be set either in Attack Decay mode, Attack Sustain Release mode or repeat mode, rate being set by the LFO. This alone broadens the sonic range.
The added CV/Gate kit (based on the Kentron one) enables this one to be interfaced by sequencers and/or modular synthesizers."
"Synth was serviced:
- fully recapped
- busbar and key contact were cleaned
- faders were cleaned and lubbed
- CV/GATE/Filter kit was added
- full calibration
It is in perfect working condition.
I have to point that the faders are not great on those synths, and though they were serviced they can be sometimes be hard to move. It's because the have a little play on the lever so when you engaged the move sometimes this play brakes them. Nothing dramatic but I just prefer to point it out, it's not Roland SH smooth faders. You just have to get how to grab them and then it's easy.
All the different SX-2000 I own had this issue and no cleaning or lube will ever make them perfect.
Cosmetic wise the synth has some wear but still looks more than decent."
This is demo mainly to show how easy it is to program this synth thanks to the amazing work Bob Grieb (Tauntek) did by rewritting the firmware and enabling Midi Control Changes messages on this synth.
The only drawback (due to the hardware) is you have to retrigger a note for every change you make on a parameter, except for a few ones that a real time (resonance, DCO and LFO waveshape for instance). Just a minor annoyance compare to the original programming method (which is actually not the worse of that kind).
The BIT99 and BIT01 are very nice sounding and quite comprehensive 6 voice analog synth. They feature 2 DCOs with triangle, sawtooth and pulse waveform, in octave from 32 to 4 and you can combine the 3 waveforms on each oscillator. Dedicate ADSR enveloppes for filter and amp with velocity control, 2 LFOs, noise generator, split or stack possibilities etc
IMO they only lack a mixer for the 2 oscillators, LFO PWM (though you can control the PW with velocity) and a hi pass filter.
But the sound is very nice, I favore it over the Oberheim Matrix 6 for instance. It sits very easily in the mix.
Build quality and keyboard are also of upper level."
"Here is a glimpse of the analog drum machine range from japanese manufacturer Ace Tone. Quite popular in the late 60s and early 70s, they were probably the leader in those presets rhythm units at the time before Roland came into the game.
Full analog, only transistors and diodes, no integrated circuit yet.
FR1 and FR2 are basically the same unit. They do sound similar (same PCB) and have the same presets. The main difference is the cancel buttons. On the FR1 you can cancel "bass drum", "cowbell", "claves" and "cymbal", whereas on the FR-2L you can cancel "snare", "claves" and "cymbal".
Of course it is very easy to mod these units and add other mutes buttons, individual levels, outputs etc
The FR20 is quite similar soundwise to the previous ones. The patterns are different, they are fewer but you have 3 "customizable" presets with differents variations of snare and cymbal, thus effectively giving it a wider range of possible patterns, and this time you have cancel for "bass drum", "snare" and "cymbal" which make more sense then the previous ones' choices.
But the main feature of the FR-20 is that it has a built in amp powered speaker cabinet. And it sound loud and deep, it's a great combo. Plus ther is an input so you can plug you organ or synthesizer and play along the rhythm (start stop with foot pedal is possible on all units btw).
The FR6 is quite a different beast. It sounds very different to the other 3, soundwise and in terms of patterns. Sound is brighter, crispier even harsher.
Note all the units where fully recapped so difference in sounds isn't due to ageing component but to design. I don't have the schematics for this one but it's definetly not the same layout. It might have been designed or "inspired" by some other model available at the time. (could be the Roland TR-66 with which it shares many features).
So here is a demo of the first one: The FR-1.
Recorded through a Teisco 120 to add some reverb."
"Very quick demo of the Wersi CX5 drum machine. Classic 80s 12 bit sounds. There are 26 of them including a analog drum synth sound plus a chromatic timpani mode (!)
Very comprehensive it has 8 analog outputs, MIDI IN and OUT, Tape, Sync and a dedicated connector to plug some pads in order to trigger the sounds.
The video focus on the MIDI control of the unit and as you can see you can easily play the sounds over midi with velocity.
And thanks to the global pitch control it is a great live performance tools in the right hands (oblivously not mine)."
"Here is a quick demo of a recently serviced Vermona ET-3 combo organ. This one is the early model that is 100% transistor (silicon). Later revisions used chipsets.
Very simple and yet quite versatile organ. You can mix 16 / 8 / 4 footages in both formants and flutes voices, with an added low pass filter ("brillant" fader) and a nice vibrato with speed and depth control.
Very clean sounding, much better than most italian ones IMO.
Recorded straight with no eq, fx or treatment."
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video upload by ohm_studi_ohm
"Quick demo of the Crumar BIT99 i fully serviced. In the frst part i flip through a few patches to let you hear how this one can sound, mainly for bass/lead/keyboards sounds. And in the second part I focus on pads and i run the synth through a custom built Wersi Wersivoice analog triple chorus. As you can hear i can turn the BIT99 into a great string machine and more.
Record with no other FX or treatment.
Pardon my playing, I'm better at servicing these instruments than playing them :-)"
"Here is your chance to grab a unique combo in the form of 6 voice analog polysynth and a custom made BBD triple chorus ensemble effect.
The Crumar BIT99 was fully serviced: - power supply electrolytic capacitors replaced - voice board electrolytic capacitors replaced - firmware upgraded with Tauntek one: you can now easily control and program the synth with any midi controller - keyboard dismantled and contacts and bus bar cleaned - meticulously calibrated - panel board and case fully dismantled, cleaned and polished - custom made real wood side end cheeks
It sounds, plays and looks awesome. It does has some wear and scuffs but it is in great condition. STAND IS NOT INCLUDED.
The Wersivoice was custom built and is a great addition to any synth, analog or digital. It simply can turn anything into a great string machine, and more. Very simple, no control: sound in sound out. There is a 3 positions switch with ON / MUTE / (true) BYPASS positions. It runs directly from 230v. Since it's DIY it doesn't look perfect."
"Here is a Powertran Transcendent analog synth I just serviced. I took the opportunity to make some modifications, mainly adding a sub oscillator circuit. I used a simple 4024 chipset and routed the -1 and -2 octave outputs to the "noise" volume pot with a 3 positions switch so that I can chose either octave sub or the Noise generator as the source for that pot. I also made modification to the CV and gate circuit which originally are not the common 1v/octave V-trigger kind. Now it can be used with any standard CV / gate interface. And last modification was a lighter one: adding a LFO rate blinking led. Very nice synth, capable of quite a wide range of sound thanks to dual resonant filter mode (Low Pass / Band Pass), S+H, repeating enveloppe, PWM etc … and now with a sub oscillator :-)
PS: this synth is not unstable in pitch. If you look carrefully you'll notice there is a slight amount of lfo (saw) modulation applied to the OSC pitch almost all the time"
"The Crumar Multiman S (Orchestrator) is one of those classic multi instruments of the 70s. 4 sections: bass / brass / piano / strings Each section (except for the bass) can be assigned left or right of the keyboard with dedicated volume faders and mute switchs. Brass has a Moog inspired ladder filter with simple AD enveloppe and cutoff and resonance control (resonance can get wild if you want to). Strings are composed of Viola and Violins, with timbre adjust. It uses a triple chorus based on the TCA350Y BBD chipsets, basically the same as the Eminent String Ensemble. You have control over the release of the strings (called "sustain" on the panel). This also control the release of the Brass sound. Piano section consists of Piano and Harpsichord sound. You can control the sustain (again it's the release actually) with a pedal only. Without a pedal plugged in the release is always at its maximum. And the release is common to the bass sound, which by the way sound huge. And to finish you have a vibrato that affects all the section."
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video upload by ohm_studi_ohm
"First part I demo a few presets and most of the controls.
On the second part I enter test mode and let you listen to the 6 voices filter calibration.
This is a good test to check if your Juno 106 needs calibration. Most of the calibration procedure is dedicated to the filter setting, since oscillators are DCO they won't drift, but the filters can. By entering test mode and selecting bank 3 you basically recall a patch that has filter in self oscillation with keyboard tracking, thus you can easily hear if any of the 6 voices is off. Just play notes in the high and low notes and listen to the pitch (and amplitude). The 6 voices should sound the same, like on this unit. If one or more is way off it's time for calibration."
"2 Korg analog drum machines: the Minipops 3 and Minipops 7
Both units were serviced and partially recapped and are working and sounding as they should.
Cosmetic the Mini pops 3 is in very good condition. The MP7 has the red lettering for second row of rhythm almost erased and it's missing the Mini Pops sticker. Case is hower in good condition.
Please note these are the Korg (Keio) genuine Mini Pops model, not the Univox SR55 and SR95."
"This is probably the rarest and strangest bird I've met. You may think it's a kind of simple monophonic analog 1 oscillator synth like the Roland SH 2000, but there is more than meets the eye. It took me some time to understand what's going on and to this day I am still not sure exactly how it works but it looks like the oscillator is a kind of very early FM based oscillator. Check the video, especially the "bell" presets and you'll know what I mean.
Tone is shaped by 3 faders labelled "Fundamental", "Overtone" and "Brillance", and these are interconnected. There is a simple envelope which works as attack decay (labelled "attack" and "sustain") by default but can be switched to attack release by the push of a button ("sustain long"). Funny thing is the attack fader is inverted compared to classic synth topology: when raising the fader the attack gets shorter. All the presets have their own envelope setting and depending on the presets the attack and decay faders do not behave exactly the same, ie the envelope faders do not totally overide the presets envelope. You can also have the envelope assigned to the filter by switching on "VCF expand", and control the envelope to VCF amount with the "Expand" fader. The "Expand Envelope" seems to invert the VCF envelope. It's quite efficient on some presets and not on others. "Touch portamento" switch is actually a key retrigger option. When activated envelope retriggers on every key stroke (low note priority) otherwise the envelope is legato. So it has nothing to do with the "portamento" fader which is indeed a portamento effect. "Gride" is basically a pitch bend (upwards only). "Growl" switch adds... growl: it adds a kind of brassy attack to the sound. Not efficient on every preset but can add to the realism of the sound on others. There is also a LFO which can be delayed (it's more like a slow attack then a proper delay), consisting of either pulse or triangle wave shape, that can be assign to "vibrato", "wow", "chorus", "tremolo", and you can have the envelope repeat on the lfo speed thanx to the "repeat" switch. And finally there is a noise generator with dedicated fader level and a "Noise only" switch that is self-explanatory. This makes for a uncommon and interesting monophonic synthesizer. Very expressive in my opinion, once you managed to tame it.
I did service this one as much as I could but without any information and service manual it's hard to be sure it's sounding as it should. There are like 15 trimpots inside to calibrate the synth and you definitely can hear most are changing tone and harmonics. Anyway it seems to fully function, it's scaled and tuned and it sounds great but again I can not be 100% sure it's sounding as it was intended.
Cosmetic wise the synth is in good condition, especially considering the rather cheap build quality. But of course it has some scuffs here and there."
"Here is a demo of a quite rare Jen SM 2007 string machine. Unit was fully serviced and is for sale. Get in touch if interested.
The SM 2007 is a very nice stringer for whomever like these classic sounds. Very compact and lightweight and still gifted with quite a number of features.
There are 3 strings sounds (cello, viola and violin) that can be individually mixed, variable attack and sustain, a tone control and of course a triple BBD chorus.
The later has 3 presets: ensemble, solo and organ that are basically different setting of the chorus effect, 'ensemble' being the full triple chorus, 'solo' uses only 2 of the choruses for a less dense sound and "organ" is the dry sound of the string sounds, thus enabling to use external fx with more flexibility.
"Auto sustain" switch makes it possible for sustain notes either to be cut when new ones are played or be left to release. And the sustain length can be massive !
Soundwise it is silky and lush, the closest I can think of is the Logan/Hohner string melody. A bit like Elka rhapsody too but denser since it has triple chorus, not a double one.
Recorded dry with no treatment."
And some pics. Note the stand is not original. Perfect fit though.
"Quick demo of an Elka Drummer One I just serviced. Every single electrolytic capacitors were replaced. You really HAVE to do it on those units, otherwise it doesn't sound like it should, and deserve. There is no way the bad quality capacitors italian manufacturers used in the 60s and 70s could still be in shape 50 years after. And it impacts the sound a lot in those analog drum machine, especially the attack and decay of the sounds. Apart from that and trimmers that need attention it is a quite well built unit and easy to service. I tuned the sound with quite long decay, I like when the sound, especially toms and congas, are bouncy. You could of course make them tighter if you like. It's a pity the unit doesn't have more patterns that use the Cowbell and Conga sound. There is only one pattern using them each. It is however easy to add MIDI or trigger input should you want to play the sounds as a regular drum expander.
Please note there is a slight distortion at some point in the video, it doesn't come from the Elka but from the Teisco Vocal 120 mixer it is plugged in, which has some very dirty gain attenuator switches i never manage to really clean, so eventually i'll replace them. Anyway, here is the Elka Drummer One. Listen with headphones or decent speakers !"
Here is a demo of the Roland DC-50 with a Juno 106.
I use a footswitch to turn the effect on/off and also compare it to the built in Juno chorus to give you an idea how they differ.
Main difference is the DC-50 is mono of course, but it can do echo. Also chorus effect is much more pronouced than the Juno one and depth can be adjusted.
Recorded straight with no treatment nor eq."
"Quick demo of a custom made ensemble FX box based on a Farfisa analog Bucket Brigade Device triple chorus. Basically it's the ensemble fxfrom the Farfisa Synthorchestra 4.
Introduced by Eminent in their Solina String Ensemble, the triple chorus is what makes in most part for that luscious string machine sound typical of the 70s, and these fx have been built in all the major string synthesizers, from the italian ones (Crumar, Logan, Elka etc) to the Japanese ones (Roland RS 505, Korg Poly Ensemble etc), and to the american ones (Arp Omnis, Moog Opus 3 etc) with minor differences in design.
As you can hear you can turn any synth sound in a gorgeous string sound.
I built unit like these from time to time so if you’re interested in buying one get in touch."
"Very quick demo of a custom built Wersi Wersivoice analog triple chorus i'm selling just to showcase once again how lush these boxes sound and how they transform any synth in a great string synth.
I adressed the Wersivoice and it's cousin the Böhm Phasing Rotor in more lengthy and detailed videos [posted here] if you're curious about these units."
"Quick video of a SIEL Orchestra I just serviced, in order to demonstrate the differents sounds you can get out of this instrument.
Also sold as the ARP Quartet this keyboard offers 4 parts: Brass / Strings / Reed / Piano
Nice filter on the brass part and strings sounds are not too bad either. They do use the same TCA350 BBD chipsets as other classic string machines like the Eminent Solina, Logan String Melody or Crumar Performer.
I use a sustain, pedal as some point, mainly on the piano part.
Recorded dry and no treatment."
"Here is another "one man band" from the 70s I just serviced. Many dead CMOS chipsets, lots of bad connections on the motherboard daughterboards sockets (broken pins, bad solder joint) and a dying voltage regulator, among other things.
Custom built keyboard to trigger the accompaniment unit, with jack socket input for pedal that introduce drum breaks.
A different flavor than the Welson Ritmo I recently demoed but definitely in the same mood.
Recorded through a Teisco 120 to add some reverb."
This appears to be the first post to feature the Elka Wilgamat 1. Note the "1" on the right. The Elka Wilgamat minus the "1" has been featured on the site before in previous posts here. Which came first? :) You can find additional Elka Wilgamat models here.
Update: according to Ohm Studio: "Electronics are exactly the same. I think this one is later and was an add for some Elka organ, maybe Concorde or something. The black color is I think factory since it’s all over the case even inside. It’s clearly the same fake wood as the original but painted black, probably to better match the organ aesthetics. I definitely remember seeing auctions with Elka organ and this wilgamat unit bundle. Also the complete wilgamat electronics and controls are fitted in some Elka organ, spinet and combo. Don’t remember which model but I did scavenged à spinet one to retrieve all the pcbs."
This Wersivoice unit is based on later revision model that uses 3x Panasonic MN3004 Bucket Brigade Device chipsets, the same chipsets used on Roland VP330 or Jupiter 4 chorus for instance, instead of the more classic Philips TDA1022 you find in earlier Wersivoice units.
No fuzz in this unit, it only does the string ensemble effect. Mono input / mono output. 3 positions switch with true bypass and mute position. Unit has a built in power supply that runs on 230v.
Case is DIY so don't expect manufacture quality.
Works perfectly of course.
