Roland 80017a

via this auction
"Problems Typically Solved by Replacing the Failed 80017a Chip Include:

* Erratic or sudden loud noise from synthesizer output, particularly after 10 minutes of powering up.
* Note hang-ups or long sustain.
* One synth voice will not respond to filter or amplifier changes.
* Unstable operation.
* Juno-106 or MKS-30: Notes will not play, most typically every 6th note will not play due to failed 80017a chip.
* GR-700: One particular voice or string will not sound, "D" string, "A" string etc.

Sound Clip of 80017a Failure in a GR-700 Guitar Synthesizer

The sound of the failure will change depending on which part of the circuit is not working: the VCF or VCA for example. The above example is provided to illustrate one type of failure. Your synth may have different symptoms as listed above.

An easy way to determine if you cable is working correctly on the GR-700 is to press the EDIT foot pedal, followed by 4 and 8. This puts the GR-700 in tuning mode. Play each string on the GR-700, and you should see the display change for each string. The displays shows "1" for the high E string, "2" for the B string, down to "6" for the low E string. If the GR-700 responds to all six strings, then your cable is good, and most likely you have a failed 80017a chip.

About the 80017a VCA/VCF chip:

The 80017a chip was a real workhorse for Roland synthesizer engineers in the early 1980s. This one chip contained both the classic, driving -24 dB voltage controlled low-pass filter with a smooth voltage controlled amplifier. By placing all the components on one chip, Roland was able to keep the classic sound of their analog synthesizers across various products, with low production costs. However, Roland did experience some probelms with the early production techniques. With reports of chip failures, Roland knew they had a problem on their hands, and changed production methods.

When these chips fail, sometimes a voice will stop working completely. On a keyboard synth, this shows up as every sixth voice not working. On a GR-700 guitar synthesizer, this shows up as one string’s synthesizer voice failing. But the chip may not fail completely, resulting in a lack of control over the filter quality for one voice, or by sudden, loud erratic sounds from the synthesizer. The only solution to these problems is to replace the existing 80017a with a new chip.

At least 20 years after the original production date, this chip is still working well without failure." There's more info on the specific chip for sale including samples at the auction.

Be sure to see this post for a fix to existing chips as well. I had the procedure done and it did work.

Roland 80017a

via this auction for the 80017a

"Problems Typically Solved by Replacing the Failed 80017a Chip Include:

* Erratic or sudden loud noise from synthesizer output, particularly after 10 minutes of powering up.
* Note hang-ups or long sustain.
* One synth voice will not respond to filter or amplifier changes.
* Unstable operation.
* Juno-106 or MKS-30: Notes will not play, most typically every 6th note will not play due to failed 80017a chip.
* GR-700: One particular voice or string will not sound, "D" string, "A" string etc.

The sound of the failure will change depending on which part of the circuit is not working: the VCF or VCA for example. The above example is provided to illustrate one type of failure. Your synth may have different symptoms as listed above. About the 80017a VCA/VCF chip:

The 80017a chip was a real workhorse for Roland synthesizer engineers in the early 1980s. This one chip contained both the classic, driving -24 dB voltage controlled low-pass filter with a smooth voltage controlled amplifier. By placing all the components on one chip, Roland was able to keep the classic sound of their analog synthesizers across various products, with low production costs. Almost immediately Roland knew they had a problem on their hands, and changed production methods.

When these chips fail, sometimes voice will stop working completely. On a keyboard synth, this shows up as every sixth voice not working. On a GR-700 guitar synthesizer, this shows up as one string’s synthesizer voice failing. But the chips may not fail completely, resulting in a lack of control over the filter quality for one voice, or by sudden, loud erratic sounds from the synthesizer. The only solution to these problems is to replace the existing 80017a with a new chip.

This chip is from lot 50, produced after Roland solved the manufacturing problems. Probably 20 years after the original production date, this chip is still working well without failure."

You can find scans for the following all via the auction here
Juno-106 Service Manual
Roland Service Note
MKS-30 Schematic
Juno-106 Failed Chip Test Procedure
Juno-106 Calibration
GR-700 Calibration

Roland 80017a

The dreaded chip that takes the Juno-106 out. Title link takes you to shots via this auction. Docs with mp3s and shots also saved here. See this post for an alternative replacement chip.

Details:
Roland 80017a Replacement VCA/VCF chip for Juno-106/ MKS-30/ GR-700/ HS60
Problems Typically Solved by Replacing the Failed 80017a Chip Include:
* Erratic or sudden loud noise from synthesizer output, particularly after 10 minutes of powering up.
* Note hang-ups or long sustain.
* One synth voice will not respond to filter or amplifier changes.
* Unstable operation.
* Juno-106 or MKS-30: Notes will not play, most typically every 6th note will not play due to failed 80017a chip.
* GR-700: One particular voice or string will not sound, "D" string, "A" string etc.

About the 80017a VCA/VCF chip:

The 80017a chip was a real workhorse for Roland synthesizer engineers in the early 1980s. This one chip contained both the classic, driving -24 dB voltage controlled low-pass filter with a smooth voltage controlled amplifier. By placing all the components on one chip, Roland was able to keep the classic sound of their analog synthesizers across various products, with low production costs. Almost immediately Roland knew they had a problem on their hands, and changed production methods.

When these chips fail, sometimes voice will stop working completely. On a keyboard synth, this shows up as every sixth voice not working. On a GR-700 guitar synthesizer, this shows up as one string’s synthesizer voice failing. But the chips may not fail completely, resulting in a lack of control over the filter quality for one voice, or by sudden, loud erratic sounds from the synthesizer. The only solution to these problems is to replace the existing 80017a with a new chip.

This chip is from lot 44, produced after Roland solved the manufacturing problems. Probably 20 years after the original production date, this chip is still working well without failure."

Demos:
Failed Chip
Good Chip

"There are four audio samples of the open string "D." The first audio sample has both resonance and filter cutoff tracking the envelope generator. The VCA is set to "gate," no VCA modulation. This sample highlights the resonance effect. The next sample has the resonance turned off, and only the filter cutoff is modulated. Again the VCA is set to "gate," no VCA modulation. The third sample has the filter wide open, with the VCA being modulated by the envelope. This is to highlight VCA modulation. The last patch is a complex modulation patch of the filter with sample and hold qualities. The mp3 file is a little over one minute in length. There is silence at the beginning, and the sample was normalized to make it as loud as possible."

Update via the comments:
"The statement that there are good lots (date codes) for these chips is completely untrue. I've seen all date codes from 40A to 61A fail."

Update: Looks like there is another one up for auction.

Roland MKS 30 Mainboard

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

Note the listing is for the 80017A voice chips only: "For sale here six 80017A voice chips from the mainboard of the Roland MKS 30, containing the rare ROLAND 80017A, good for repairing your faulty voices on the JUNO 106, HS60, MKS 7, MKS 30, GR 700. Six 80017A are on the board and are fully operational. Price is for one chip, six available."

Why does the Juno-60 sound different from the Juno-106?

Juno-60 diagram on top
via Sequence 15
"So let's start by getting a couple of things on the board out front. The VCO, VCF, and VCA circuits are nearly identical. "How can you say that", you might ask, "when the 106 uses those 80017A's that keep failing, and the 60 doesn't?" Consider: The 60 uses a VCF filter circuit based on the IR3109 quad OTA. It uses a BA662 VCA to control the resonance. A second BA662 serves as the voice's VCA proper. As for the 106? The notorious 80017A is really just an encapsulation of three ICs and some resistors. The IC's? An IR3109 and a pair of BA662s! It's the same circuit, just in a smaller package. A lot of people don't realize that when you look at an ordinary IC, most of what you see is packaging; the actual integrated circuit is a tiny bit of silica embedded in the plastic. Roland bought a bunch of unpackaged 3109s and 662s and had someone encapsulate them, and voila, the 80017A was born. Similarly, the Juno-60's DCO circuit: the counter IC that times the DCO, the reset transistor, and the wave shaping circuitry are encapsulated into the much-less-infamous (because it seldom fails) MC5534 in the Juno-106. The voice circuits are, for all practical purposes, the same." So why do they sound different? Check out Sequence 15 for the full post.

Roland Juno 106 Synth with quick pulls + stripped 80017a's

Note: links to listings are affiliate links for which the site may be compensated. via this auction

"Here we have a 106 in fairly good condition, cosmetically, and excellent condition electronically, as re-conditioned by myself. I have bought, restored and sold over 100 106's in the last 10 years, 7 so far this year with destinations such as Australia, Sweden and the U.K not being a problem. This one is fitted with stripped 80017a's on quick pulls. That means it's reliable. It comes with a patch CD/DVD for whenever you want to load it with fresh sounds, and there's some fresh sounds already in it. A couple of paint scratches adorn the facia and a metal scratch, next to the LFO slider, but asides from that, this is a great sounding, clean, all switches and sliders like new, 106. Comes guaranteed fully functional and any difference in shipping will be re-funded."

See this post for stripping 80017a's.

Roland 106 Repair - Part 1

YouTube via spindizzyman | June 13, 2009

"Taking a voice chip out of a Roland Juno 106 and sticking it in acetone to strip the resin. I figured out that Chip 4 was bad in my unit. I've never done any kind of electronics before so this just shows you how easy it can be (with a healthy dose of patience and a steady hand).

First you should figure out what chip is bad. You can do this by powering on the unit while holding the key transpose button. Then hitting a key and watching the display cycle through numbers 1-6. If nothing plays on a number or the sound sustains on that number (hit different notes to hear it change pitch) then you know what chip it is.

There is a great video on youtube that shows you how to strip the resin off a chip and hopefully repair it. This is apparently due to overheating and conductivity due to the old resin.

Taking it out of the unit is pretty easy and you can search youtube for videos on how to open up the 106 and get the board out with the voice chips attached.

I have never done any electronics work before so I practiced on an old VCR for an hour. I learned how to take out components and solder them back in until I felt comfortable.

It helps if you have a few drinks before hand to steady your hand and nerves. Ok, probably not but it was Saturday and I'm all about the tequila on a Sat afternoon with nothing more to do than some trial electronics work.

In part 2 I'll figure out how to strip the resin and re-solder the chip back into the board and re-install into the 106 to test.

All credit where it's due just google 106 repair and you'll see the videos I watched to learn how to do this or look up

http://www.youtube.com/user/rolandsh1000

for the resin strip and...

http://www.youtube.com/user/ShakerCuda71

To see how to remove the board from the unit.

Cheers!"

CLICK FOR MORE »

On the Workbench: Juno-106, part 2

Roland 80017A voice chips on edge. Click here for part 2 of the repair post on Sequence 15.

BTW, be sure to check back on Sequence 15 for progress as I do not plan to put up every post. I thought this was a good image of what the dreaded Roland 80017A voice chips look like on the board. The chips are notorious for going out, and they can be very difficult to find. You can find all posts on the 80017A, including a clone of the chip here.

Time-Saving Methods of Rescuing IR3109N OTAs from 80017A Wafers

video upload by gstormelectro

"Audio + Video by G-Storm Electro c. 2025

Today I am sharing spilling the beans on my 80017A wafer-stripping and chip reclamation methods. Over time I have developed my own system for improving the speed and success of reclaiming coveted IR3109N SMD OTAs in decent quantities. These OTAs are used in my 101-VCF, JP6-VCF, and JU60-VCF eurorack modules. Even with time-saving measures, I easily spend way more time reclaiming the chips than actually building these modules. And the main reason I call my endeavors a labor of love, it's all for you my friend.

0:00 | Intro
0:31 | The 80017A Wafer Encapsulation
1:52 | My Method for Removing the Black Resin
4:21 | Extracting Chips from the Wafer
6:26 | Mounting the Chip to a DIP ADAPTER

MUSIC https://gstormelectro.bandcamp.com/
BLOG http://gstormelectronica.blogspot.com/
LISTEN/DOWNLOAD http://soundcloud.com/gstormelectro
REVERB https://reverb.com/shop/gstormelectro"

Possible Repair Technique for the 80017a, the Juno-106 Voice Chip

YouTube via rolandsh1000

"Upfront, I'd like to say that I take no credit for inventing this technique, only for demonstrating it. I was inspired to try it by two compelling images that a person named Ramcur had posted on Flickr. I emailed him and he told me what he had done. So very special thanks to Ramcur for the method, and thanks to Chris Strellis (http://www.strellis.com) and K/Modeless Factory (http://modelessfactory.com) on the Analog Heaven mailing list for sending me sample failed chips to test this method out. Please visit their sites and patronize their services!

Some background: my HS-60 had 4 bad voices so I removed those 80017a's with plans to buy clones sometime in the future. But after I stumbled across Ramcur's photos, I tried to see if these chips could be repaired. I first used a professional heat gun, and I was able to salvage 2 of the 4 chips satisfactorially by simply removing the resin coating of the chips (the right heat allowed me to peel the coating off). But that was still only 50% yield and about 30minutes messing around with the heat gun - not easy.

After Ramcur emailed me back about using acetone, I tried it on a bad 80017 that Chris Strellis had sent me and it worked great. So I decided to create a video to show how this might be done. In the video, my HS-60 has been fitted with SIP socket to allow for quick swap out of the chips for testing. These sockets are in voice slots 2 and 3. Slot 1 has a 'known good' chip for comparison. In the final part of the video, I installed the chip that I was able to get "cleaned" in slot 2 for comparison to the good chip in slot 1 (slots 3, 4, 5, and 6 have no chips/are empty). I apologize for the bad lighting in that last part.

Does this really fix the chips? What about longer-term performance? The chips I've "rescued" so far I have put in my constantly-powered-on HS-60 for over a week and checked them twice a day and all of them no longer had any popping or cracking or cut-outs or runaway resonance or any of the classic failure modes of the 80017a. They did sound slightly different chip-to-chip, but I think that was due to me not recalibrating the trimmers for each voice.

Should you try this? I'd say you have nothing to lose and, as I show, it's pretty easy to do. If you already have a bad voice chip in your 106 or HS-60, you already would have to desolder it to install the reportedly-excellent clones from D'Naab (http://www.analoguerenaissance.com). So you could try this method first and, if it doesn't work or it's not to your liking, or you just want the comfort of something pretty much guaranteed, then you can always get the clone.

As the weeks go forward and I get time, I'll be subjecting this method to a lot of known-dead chips. I'll try to report back how that goes.

Good luck!"
Roland Juno-106 chip fix - IC repair

Juno 106 Replacement ICs

There is finally hope for the dreaded failed voice of the Roland Juno 106. Someone has cloned the chip.

Click here for the official page on the chips with more info and how to get them. They are also up for auction here.

Anyone else thinking what I'm thinking? These might be great for a DIY project or a new synth.

Details:
"The most common problem with juno-106's is one or more of the voices going dead or that keep hanging. The problem is the poorly manufactured A1QH800170 or A1QH80017A custom vcf and vca ic. Since these ic's are no longer manufactured and roland has no spares for them anymore, we are forced to scrap other 106's for spares. Which is not a good idea because every single one of these ic's will die. Therefore I did some research on those ic's.
First I designed a vca clone, that only took over the vca of the 80017A, but still used the vcf part (if that was still alive). This design was completed at the end of 2003. Numerous of these ones have been sold and installed to great succes in juno's worldwide.
After that I continued my research on this ic with the goal of designing a full clone of it. This was a particulary hard job because only little is known about the intestines of this ic: only the rough outlines which are displayed in the juno-106 service manuals and the little info that is available on the IR3109 and how it is used. It took no less then 6 restarts from scratch until I had a prototype of which I thought that it was on the right track. The bigest problem was the creation of an exponential current source that has the same error and temperature tracking as the one inside the IR3109 (of which no one knows how it was built). When this problem was solved (about nov 2004) I could start doing signal analysis on both an opened 80017A and my design to adjust gain levels so that the non-linearities (tanh) of each stage were the same(summer of 2005). After that I designed a smd prototype for further testing which surfaced more problems: strange behaviour with resonance at very high and low frequencies, which were all solved by the end of 2005. At this moment I was unable to measure nor hear any difference between the original and the clone. After that I built some more prototypes and installed these in 4 different juno's owned by different people. These have been in test for several months now and none of these people were able to tell which voice had the clone.
After that only minor changes (pcb-design)were done until the final design which is now (may 2006) for sale:

summary:
-Designed and built to the highest standard.
-No measurable nor audible difference with the original. I'm very serious about this and I'm well aware that my clone is the only one which sounds right.
-All integrated components are in mass-production by more than one manufacturer and have been available for over a decade. Thus have a proven reliability and are easy optainable(in the very unlikely event of failure).
-Used discretes are close tollerance and high quality (capacitors are the infamous panasonic stacked pps film ones)
-very high quality pcb.
-Installation is straightforward: remove the defective 80017A , replace it with my clone and re-adjust your juno as described in the service manual. (please do not ask me how to do this. I simply do not have the time to give electronics lessons. If you don't have the knowledge: consult your local synth-geek)"

JUNO VOICE CHIP 80017A CLONE UPDATED

Remember this post? If you have a Juno-106 with the faulty voice problem there is still hope. Latest update dated April 16, 2007: "I completely overhauled my 80017A clone: Smaller, even higher quality and easier to install." Title link takes you there. BTW, in case you missed this post, the site is also home to the Analog Renaissance TS-303 MK2 ACID SCREAMER.

Via Dennis

Roland Juno-106 61-Key Programmable Polyphonic Synthesizer SN 525338 & 474470

Note: links to listings are affiliate links for which the site may be compensated.

SN 525338via this Reverb listing

Additional SYNTH CITY Listings

"A high water mark for glassine pads, premier brass stabs, and surprisingly present basses, the Roland Juno 106 is well deserving of it's status as a classic synthesizer. All voices have been refurbished, this is a fully working specimen, with all sliders and pots cleaned and working wonderfully. Physically, this unit is in very clean condition with average panel wear.

Service Notes:
New set of voice chips (Rosen Sound 80017a clones)
Power supply and voice board fully calibrated
Panel board and all controls cleaned
New dust covers on panel faders
Bend assembly and controls cleaned
keys and chassis cleaned"

474470 via this Reverb listing

Service Notes:
New set of voice chips (Rosen Sound 80017a clones)
Power supply and voice board fully calibrated
Panel board and all controls cleaned
New dust covers on panel faders
New tact switches for all panel buttons
Bend assembly and controls cleaned
Bend arm and rubber stopped replaced
Jack board connectors resoldered
Standard IEC grounded AC power connector installed
Keys and chassis cleaned
replaced missing fader cap

CLICK FOR MORE »

Custom Skinned Roland Juno-106 Keyboard Synthesizer Synthspa Renewed

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

"Deluxe Juno-106 Restoration

1. PANEL BOARD REBUILD:

All faders rebuilt, all non-functioning buttons replaced, leds replaced if not working, and any broken or missing faders replaced for $30 USD each.

2. MODULE BOARD REBUILD:

All six 80017a voice chips restored and guaranteed working, calibrated to factory standards, and small defects within the module board repaired.

3. POWER BOARD REBUILD:

Large electrolytic capacitors replaced and power jack converted to the standard 3 prong computer cable receptacle. Includes new 3-prong power cable.

CLICK FOR MORE »

Custom Roland Juno-106 Synthesizer with Wood Side Panels, Blue LEDs & Pitch Stick

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

"This is a fully restored Juno 106 with a "Blue Meanie" upgrade and paddock wood end bells. This thing is amazing I just don't have time to play it and I would rather have it go to a good home. (my old ebay page was compromised so I had to create a new one. Sorry for lack of feedback =\ )

Restored and upgraded by Allen and the team synthspa.com (they did a great job)

Power PCB rebuilt - Large electro caps replaced, new 3 prong receptacle and new standard IEC power cable.
CPU board rebuilt - Old Battery removed, new removable battery chassis installed with new battery.
Module board rebuilt - 80017a voice chips restored & fully calibrated, comes with the SynthSpa guarantee!
Panel board rebuilt - All sliders removed, rebuilt, de-oxidized, re-soldered, and all new buttons.
Bender board rebuilt, volume & portamento knobs cleaned.
Keys cleaned - surface cleaned, key contacts de-oxidized.
Blue lighted bender.
Blue 3mm LEDs.
Blue 2-Digit seven segment display.
Paddock wood end bells.
Clear coat - To protect your fragile screen print for years to come.

80017a Voice chips under lifetime warranty from Synth Spa and are easily removable (not soldered in anymore)

Again, this thing is in incredible shape. No cosmetic blemishes whatsoever. Just needs a new home"

New Analogue Renaissance Roland Juno-106 80017A-GS Chips w/ "Gravitational Slingshot"

Roland Juno-106 Synthesizer w/ Gravitational Slingshot Chips Overview + Demo

Published on Apr 30, 2019 gstormelectro

"Audio and Video by G-Storm Electro c. 2019

Today I got a special package from Syntaur, the USA distributor of Analogue Renaissance products. It's a set of six 80017A-GS VCF/VCA replacement upgrade chips for the Roland Juno-106 synthesizer. What's involved to install them? How do they sound? I'll demonstrate - but you be the judge! Be sure to post in the comments what you think. If this demo was helpful be sure to like and subscribe :D

0:00 Talking
- What are the Gravitational Slingshots?
- What I did to prepare for installation.
- A word on testing/calibration: it's absolutely required
- A minor caveat about my particular synth.
4:17 Audio Demos
- Listen to this w/ some nice headphones.

Audio recorded direct to Tascam DR-05
No additional effects."

This one is in via Soviet Space Child.

Original ROLAND 80017A VCF/VCA Chips

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

"ROLAND 80017A VCF/VCA original chip for Roland Juno 106, MKS-7 Super Quartet, MKS-30, GR-700, HS-60."

Roland 80017a Chips Removal - GR-700 MKS-30 Juno 106

YouTube Uploaded by WayneJoness on Apr 11, 2012

"http://www.joness.com/gr300 This video shows the removal of a 80017a chip from a GR-700 printed circuit board. The tools I used were a Radio Shack 30 watt soldering iron, desoldering wick, soldering helper, and Caig DeoxIT D5. The basic Radio Shack 30 watt soldering kit has almost everything your need. I find that spraying the Caig DeoxIT D5 between operations helps keep the PCB clean, and helps the old solder flux move on to the desoldering wick. After I have removed the solder from the pins, I used the soldering helper to line the pins up, then gently rock the chip back and forth to make sure everything is loose. Rather than pull the chip out, I first push on the pins on the soldering side, then gently tug at the chip. It comes right out. If you have not tried this before, I recommend practicing on some spare parts, as this can be tricky and frustrating."

Rosen Sound Synth Demos & Restorations

Published on Jul 28, 2018 Rosen Sound

This one in via Soviet Space Child.

www.rosensound.com/rentals

Playlist:
1. Oberheim OB-X - Rosen Sound Demo

The OBX was the first major "answer" to the Prophet 5 synthesizer, and at least in our opinion, was the best answer anyone could've given.

The OB-X is based on the basic design of the (S)ynthesizer (E)xpander (M)odule also from Oberheim. Like the SEM, it features two discreet VCO's with saw and pulse, two envelopes, and the low pass section of the SEM filter. It also added noise, a release control, and cross modulation (similar to the Prophet's cross mod). The prophet's cross mod was a bit more dynamic, though. A flexible LFO section is also featured.

None the less, the OBX is in a species all of it's own in many ways. It's one of the very few mostly discreet programmable polyphonic synthesizers, and more than that spec, it sounds unique and absolutely marvelous.

Our unit features encore midi

Book your rental package with Rosen Sound and see the rest of our synth catalog at www.rosensound.com/rentals

2. Moog Minimoog - Rosen Sound Demo

3.SCI Prophet 5 - Rosen Sound Demo

In a lot of ways this needs no introduction. One of the most iconic poly synths ever made, and the first synth to offer true programmability with polyphonic architecture.

The Prophet 5 offers your basic amenities in a poly synth with 5 voices each with 2 VCO's, a low pass VCF, a VCA, two EG's, one LFO with multiple wave shapes available, with POLY MOD as the icing on the cake. This lets you make FM type sounds and is part of what makes the prophet 5 unique.

Our unit features factory midi

4. Oberheim Four Voice - Rosen Sound Demo

This in our opinion is one of the finest synthesizers ever made in terms of overall sound. The features are of course many and the synth as a whole is very flexible and powerful, but the sound it outputs is nothing short of mesmerizing.

The FVS features 4 Synthesizer Expander Modules (SEM) each representing a polyphonic voice. This means for one patch, each SEM must be setup identically. This may seem like too much, but it's actually a very enjoyable process that causes you to think different about the patch your making, the polarity of your modulation per voice, and subtle differences you can set.

The synth can also be used in a powerful unison mode, allowing each SEM to be adjusted separately for a crazy 4x dual oscillator synthesizer each with a multi mode filter to be fired at once.

Each SEM is as or more powerful than your standard mono synth, featuring 2 oscillators with saw and pulse each, PWM, FM, 1 LFO, two EG's, a bi-polar filter modulation control, and the sweetest Oberheim filter ever made featuring a bandpass filter and a sweepable LP-HP filter. These filters are special in the way that when the resonance is turned up, there is no loss of volume or low end.

Additionally, our FVS is an early model with no programmer (a feature loathed by many anyway). Instead, it features 2 dual mini sequencers with a common clock available. This means you can do 8-step 4 note poly sequencing between the four SEM's, or split the keyboard with one sequencer playing 1 SEM and 3 note chords on the other side of the keyboard.

Functionally, our FVS is very much in tune and has been stabilized to survive travel and tuning consistency. It is in tune as soon as it's turned on, and we provide a quick start guide for our rental customers to learn how to easily program and tune the machine.

Our FVS also features MIDI in via a modified YARN's module installed inside. This allows through basic midi and if desired (more complicated) midi scripts to play it polyphonically (default on boot), sequence each SEM assigned to a separate channel (enabling MPE), or played in Unison. All of these features can be harnessed by utilizing SYSEX or the Yarns editor, all which is provided on a thumb drive for rentals.

5. Moog Memorymoog - Rosen Sound Demo

To start, let's forget the internet-lore or an "unreliable" and "impossible to tune" machine. Our service shop is known worldwide for our work on Memorymoogs and stabilizing them for real production use.

Now, let's introduce you to (what we consider) the pinnacle of Moog synthesizers. With 3 oscillators + ladder filter per voice, flexible and intuitive modulation, and a knob per function, the Memorymoog is not a force to be reckoned with, and is in what we consider to be the top 3 best sounding synthesizers ever made.

From lush pads, 18 oscillator unison leads, heavy bass, and even gentle timbres, the memorymoog is sure to be a staple piece for your session in any genre on music. Plus it has everyones favorite feature: an arpeggiator!

Our rental memorymoog will arrive with an expression pedal and 12 custom patches (87-99) made by our resident in house programmer, Eli Goss. These 12 patches are the juice that will fuel modern productions to achieve sounds unobtainable by any other synth, with plugins not even worth a mention.

6. Oberheim OB8 - Rosen Sound Demo

One of our staple synths in the collection. The lore of the OB8 is that it's a less-exciting OBXa, however, with some choice mod's which we've done to ours, they are sonically identical.

The OB8 is one of the most flexible synthesizers available, which includes deep LFO routing from the front panel, and a PAGE 2 function that transforms every knob and button on the synth to do even deeper modulation, including quantized LFO's, musical "OBXA" style detuning, envelope routing, and more.

Additionally, our OB8 has been fitted with a Pratt & Read keybed, which brings the true feel of American poly synths to the experience, while also having the amenities provided by the B5 EPROM including factory midi.

7. Sequential Circuits Prophet 10 - Rosen Sound Demo

The Prophet 10 is more than just 2 Prophet 5's in one box; featuring an active EQ per voice, deeper modulation, and more performance capabilities with it's dual manuals and CV pedal inputs. This prophet 10 also features midi in and out.

8. Oberheim Four Voice Sequence

You could do an entire score with this #oberheimfourvoice. With quad poly sequencing and split modes the sky is the limit. Available for rent through us! Contact us for rates and availability. And yes, it has midi!

9. Prophet 5 Rev 3 Restoration

10. Juno 106 Multiboard removal

11. Juno 106 80017A Chip Failure - What To Check

In this video I go over a couple things to check not only to see if your 80017A chips are failing, but also other potential failures of the juno, including failure of one of the MC5534A dual DCO chip.

This video also applies to other models, such as the MKS 30, HS 60, GR 700 and some others.

If you would like Rosen Sound to service your Juno, please contact us at contact@rosensound.com

Roland Juno-106 SN 537997

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"I ran the unit in test mode, and it seems like voice chips number 1 and 3 is not working properly and would probably need replacing. Everything else should be working well to the best of my knowledge, all the keys and buttons and sliders, as well as preset memories and writing function working fine."

Related:
Juno 106 Replacement ICs

Possible Repair Technique for the 80017a, the Juno-106 Voice Chip

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