Devil Fish modifications for the Roland TB-303
© Robin and Tina Whittle, Real World Interfaces, Daylesford, Victoria, Australia 22nd January 2015
Devil Fish User Manual. DF-MIDI-In-Manual.pdf
Manual for the MIDI In System V1.0.4. DF-MIDI-In-Out-Manual.pdf
Manual for the MIDI In and Out System with Dynamic Bank and/or Channel Switching. New!
Manual for the MIDI In System V1.0.0 to V1.0.3. This includes descriptions of and workarounds for two bugs: MIDI In notes are played 1 semitone higher than they should be and invalid data may be written to the non-volatile memory which stores the settings for the MIDI In system. DF-32-Bank-Mem-Manual.pdf
Manual for the 32 Bank Memory System. DF-32-Bank-DBS-Mem-Manual.pdf
Manual for the 32 Bank Memory System with Dynamic Bank Switching (DBS) or Dynamic Bank/Channel Switching (DBCS, with the MIDI In and Out system).
midi-options/ Two approaches for Devil Fish MIDI In and Out. This covers the Devil Fish MIDI In system, the Devil Fish MIDI In and Out system and the Quicksilver 303 MIDI In and Out CPU replacement system.
sounds/ Sound samples.
Photos of Devil Fishes. videos/ Videos of Devil Fishes in action.
TT-303/ Information on the Cyclone Analogic TT-303 Bass Bot. prices-au/ prices-int/
Prices for customers in Australia and overseas.
TR-606 and TR-808 modifications. ../smem/
32 Megabyte memory boards for Akai samplers.
22nd January 2015: I am making progress on the backlog of work.
15th September 2014: I have completed the MIDI In and Out system, with its Dynamic Bank and Channel Switching capabilities. See the Devil Fish MIDI In and Out Manual (the link is above) for the full documentation of these.
One of three modes of MIDI Out operation is automatically selected:
Int Seq mode Note pitches result from the Internal Sequencer when it is playing a pattern, in Pattern Write, Pattern Play, Track Write or Track Play modes.
Ext CV mode Note pitches result from measuring the voltage of an externally applied Pitch CV, plugged into the CV In socket – or, if no lead is plugged into this socket, by measuring the internally generated CV (from the TB-303’s 6 bit DAC) which results from the Internal Sequencer playing notes during Pattern Write mode when it is not playing the pattern. This is when the user is entering and altering pitch, timing, Accent and Slide information.
MIDI In Follow mode When the MIDI In system has reception of Notes and Control Changes ON (hold TAP and press and release BACK), the MIDI Out system replicates via MIDI Out Note On and Off messages the notes the MIDI In system is playing on the Devil Fish. This includes the way notes are generated with Dynamic Channel Switching.
For full functional details of these modes, please see the MIDI Out further explanation section of the user manual.
We have a new modification for the 32 Bank Memory system.
For the TB-303 Devil Fish (with or without the MIDI In and Out system or the MIDI In system), for the TR-606 and for the TR-808, Dynamic Bank Switching enables two external Audio/CV signals (or potentially four for the TR-808) to alter the currently selected memory bank, instantaneously. This is done by detecting the signal exceeds about +1.15 volts, and using this to invert one of the five address bits which select which of the 32 memory banks is currently accessible to the Internal Sequencer.
The following description concerns memory bank switching, but the same two inputs, detector circuits and switches can also be part of Dynamic (MIDI In) Channel Switching, in Devil Fishes with the MIDI In and Out system.
The primary purpose of this is to enable switching between patterns, moment-by-moment, in response to manipulation of the toggleswitches and pushbutton and in response to external audio or CV signals. Since the Internal Sequencer reads from memory every time it plays a note, this means that notes from patterns in various memory banks can be played in the middle of patterns.
The manual for this is above: #MEMDBSMAN . The only visible parts of this are two 3.5mm sockets on the left of the machine, and two LEDs, which, when on, indicate that the detector circuit has been activated and that the address bit from the corresponding toggleswitch will be inverted before it is used to select one of the 32 memory banks.
Here is a description of Dynamic Bank Switching (DBS) for the TB-303 Devil Fish, which involves just the switches, input sockets and LEDs - not the MIDI functions. The same capabilities will be possible for the TR-606 and in 2 and 4 channel versions for the TR-808.
The DBS hardware for consists of two 3.5mm audio or CV input sockets on the left of the machine. Whenever the audio or CV input signal becomes more positive than +1.15 volts (which high level audio signals will exceed in the positive part of their waveforms), the circuit turns on. The circuit remains on for about 33 milliseconds after the input signal goes below the +1.15 volt threshold. So audio signals of 30Hz and higher (and somewhat lower, depending on the waveform) will produce a continual On state as long as part of their waveform exceeds about +1.15 volts. The inputs can handle -15 to +15 volts.
When the detector circuit is On, its Red LED is On and the address bit which is generated by the associated togglewitch is inverted. If the detector circuit is Off, everything is as per normal: The low and high positions of the toggleswitch produce 0 and 1 respectively for the address bit. This is one of the 5 bits which selects one of 32 (2 x 2 x 2 x 2 x 2 = 25) memory banks, numbered 0 to 31. When the detector circuit (and so the LED) is On, the low and high switch positions produce 1 and 0 respectively, thereby selecting a different memory bank than when the circuit is Off.
Each of these sockets, detector circuits and LEDs is like an audio or CV controlled version of the Red pushbutton switch of the 32 Bank Memory system. That pushbutton inverts the address bit produced by toggleswitch 4. The two new inputs invert the address bit produced by toggleswitches 3 and 2.
This means audio or CV signals can switch the Internal Sequencer from playing a pattern in a particular bank of memory to playing the same pattern number in some other bank of memory whose 5 bit address differs in one bit. Since the Internal Sequencer looks into memory for each note it plays, this means that the notes it plays, with Accent and Slide, can chop and change between those from patterns in multiple banks of memory, in the middle of a pattern. The Devil Fish synthesizer and, if it is installed, the Devil Fish MIDI In and Out system and its one more slave devices, will play this set of notes.
Lincoln Webber has has posted an annotated demo of using this Dynamic Bank Switching (DBS) system:
In this demo he is using as inputs a CV from an LFO and the Accent CV out of the Devil Fish itself. He is not using audio signals as inputs or driving a slave device from MIDI Out. In this configuration, the Accent signal is coming from him pressing the Accent Button or from any Accents which may be programmed into the pattern.
A simple and elegant approach is to alternate between two patterns with an LFO which is running with a cycle just a little slower or faster than the pattern time itself. Lincoln is doing this with one of the signals.
Since there are two channels, there are four patterns which can be selected by the four combinations of the two input signal states. One or both input channels could be MIDI controlled by driving any MIDI synthesizer with Note On and Off events and using its audio signal, perhaps through an amplifier if its positive peaks do not already exceed about +1.15 volts. With the MIDI In and Out system, if nothing is plugged into an input socket, the output of the socket (the input to the detector circuit) can be driven by a signal derived from MIDI In: Note and/or Control Change messages received on Channel 15 or 16.
Other sources of signal to drive these inputs include: CV or audio from modular gear; talking into a microphone, the signal of which is amplified to a suitable level, and: using some audio, including from the Devil Fish or a slave instrument and delaying it. Also, using a brief audio signal into one input and a delayed version it into the other. Then a pulse of audio will take the memory system through four memory banks:
Pulse - invert A2: 0000001111110000000000000001111111100000
Delayed - invert A3: 0000000001111110000000000000001111111100
Bank number: 0 0 0000 ------ ------------ --
4 0 0100 --- ---
8 0 1000 --- ---
12 0 1100 --- -----
Address bit 4 3210
The above timing chart is for all switches being down, with the pushbutton not activated. At any time these can be activated, and in the case of switches 2 and 3, this would invert the bits shown above, thereby selecting different banks.
I was prompted to devise this modification by discussions with Ricardo Velarde and Lincoln Webber. Lincoln has some other Devil Fish videos here.
Here is some more information about the MIDI Out functions of the MIDI In and Out system.
In MIDI In Follow mode the Accent Button and/or the Accent CV In socket adds Accent to MIDI Out notes where these are generated from MIDI In notes without Accent. This replicates the behavior of the Devil Fish synthesizer by ignoring the Accent state of the Internal Sequencer, which might be on due to the sequencer having stopped on an accented note. I have also added:
Today I passed it over to the band. They went mad. Immediately they
locked the studio and started to build sounds. Nobody can stop them now.
They are very happy and they say thank you thousand times!
I want to let you know I am successfully exploring what the Devil Fish
has to offer. And it IS overwhelming... I've owned plenty of
synthesizers before but... I've never imagined a "relatively simple"
synth such as my Teebee will transmute into such a miracle.
Also, I've noted that the Devil Fish is very capable of creating clicky
sounds with low decay values. They can be very useful for percussion
and other things. What's more, the resonance and muffler settings can
get relatively thin sounds, this feature can be utilized to fit more of
the Devil Fish "juice" into the mix. More tracks, more layers, more
I begin realize that it's, in fact, possible to create a lot of
layeristic stuff - create entire soundscapes using only the Devil Fish
and outboard effects.
Oh by the way you probably know this.... You can change MIDI modes and
reset while machine is running so you can turn off/on MIDI reception
during a track, its really neat I use it a lot, as well as running the
Accent Out to an attenuator(Moogerfooger CV processor) and out back into
the Devil Fish Slide In and I can Turn the Att. up and down to turn on
Slide/Gate etc...thats fun also the CV processor has a Square/Triangle
L.F.O which I often use for the CV filter in for rhythmic filter sweeps
and other crazy fast bell like effects when turned up full and I love
using the mod wheel to filter it means I do real dramatic filter stuff
without killing the D.F.'s Cutoff knob and also be able to freak it out
and return to the exact same sound setting.....Endless...........
Sound samples are at: sounds/linxstar/ . Seven years later (2013), from and undisclosed location in the Dandenong Ranges, with
occasional transmissions via YouTube, and soundcloud.com/linxstar/ Linx writes:
and in many other countries, musicians have placed themselves in the care of the Devil Fish.I have at the moment (even as I'm writing this) a convoluted modular
patching arrangement between the Devil Fish and three Moogerfoogers -
CP251 control processor (receiving and sending CV to/from-the Devil
Fish, MF-101 lowpass filter, MF104z delay (which is receiving the audio
out of the Devil Fish and is in a feedback loop, using the delay signal
only to the lowpass which in turn is sent to the DF audio in to filter.
The CP251 is also sending noise to the FM in (there is only the slide
in and accent in not being used). The DF CV out is controlling the
feedback on the Delay. The Accent out is used to trigger the sample &
hold unit in the CP251 and the Gate out is modulating the env amount on
the lowpass. Its creating a percussive acidy snarey rhythmically
changing delay with a twist. I'll record this tomorrow, I probably
should have today as at one point when I stopped the sequencer the CP's
LFO and S&H kept triggering the DF and MF's and it was quite
interesting how it all evolved.
The Devil Fish is a modification to the TB-303 - a synthesiser/sequencer produced by Roland in 1981/82, which has played a crucial role in the development of electronic dance music. A detailed description of the Devil Fish can be found in the User Manual Devil-Fish-Manual.pdf . Features include:
* These three audio signals are connected in the following manner:
The Audio In to Filter signal is plugged into the old 6.5mm mono Mix In socket, on the left of the rear panel. There is an option (see below) for a three position toggleswitch to control this signal.
The Audio In to Frequency Modulate the Filter signal is plugged into the old Headphone socket, with the tip of the socket accepting this signal. This means a mono 6.5mm plug can be used for this function.
The Audio Out from Filter signal is driven to the ring of the old Headphone socket. There it can be accessed with a suitable stereo plug, or by partially inserting a 6.5mm mono plug.
To make it easy to use the Audio In to Frequency Modulate the Filter and the Audio Out from Filter, the Devil Fish is supplied with a special lead with a 6.5mm stereo socket and two 6.5mm mono plugs on a Y-lead.
The standard Devil Fish modifications do not include a Headphone output, because the original Headphone socket is used for these two new purposes. There is an option to provide a 3.5mm Headphone socket - see below.
"Devil Fish", Lembeh Strait, Bunaken, Indonesia. © Ken Knezick.
Great photos: www.islandream.com
The optional 32 bank memory system enables switching between banks while a pattern is playing. So the sequencer reads the next note from the same pattern number in the new bank. This enables much more interesting and unexpected results than are obtainable by having the sequence change from one pattern to another, which it only does at the end of each pattern.
Full details: DF-32-Bank-Mem-Manual.pdf .
There is a second version of the 32 Bank Memory System manual which covers Dynamic Bank Switching (DBS if there is no MIDI In and Out system) or Dynamic Bank and MIDI In Channel Switching (DBCS), if the MIDI In and Out system is installed: DF-32-Bank-Mem-DBS-Manual.pdf . The DBS/DBCS versions of the 32 Bank Memory System can be fitted with an optional Disable Switch, which enables or disables the detectors of the two approximately +1.15 volt Audio/CV input sockets. This switch is normally mounted to the right of the Tempo knob.
Detector circuits and their LEDs and address bit inversion circuits are enabled.
They are disabled.
They are enabled, but this is a momentary position, with spring return to Mid position.
The optional MIDI In system uses the existing Sync socket, and receives Sync, Notes, Accent (depending on the note's velocity), Slide (from MIDI controllers or tied notes) and Filter Frequency (from a selectable MIDI controller number, defaulting to Mod Wheel). Full details: Devil-Fish-MIDI-Manual.pdf
There is also a special Sync Lead which accepts MIDI In, and provides a daisy-chain of three Sync out connectors to drive, for instance, devices such as other TB-303s or Devil Fishes, TR-808s or TR-606s. See the sync-lead/ page.
The MIDI Out extension to the current Devil Fish MIDI In system is almost ready. Please see midi-options/ for further information.
New LEDs in Red, Orange, Yellow, Green, Blue and White: leds/ .
We suggest all Blue LEDs, except for the Run/Stop LED, in which we install a new Red LED. These are a broader blue spectrum than most blue LEDs, with more violet – a somewhat different colour than the slightly aqua color of most blue LEDs. They are also a good brightness, whereas the ordinary blue LEDs are too bright unless the drive circuits are adjusted.
Replacing pots and switches. The tact switches underneath the 24 buttons almost always need replacing. We install Omron B3W-4050 sealed tact switches. These are sealed against dust and liquids and we expect they will last for many decades. More information about the Omron switches and why we chose them over the alternatives: tact-switches/ (We sell these specially modified Omron switches for people who want to replace the switches themselves: #tact_switch_kits .)
The six small pots along the top of the TB-303 sometimes fail. Between about 2004 and 2012 we replaced them with newly manufactured pots from TechnologyTransplant.com and since 2013 we have been using pots identical to those in the Technology Transplant TT-303 Bass Bot. I dismantle these pots and replace the original friction grease with a lighter grade silicone grease, so the 6 small knobs are very easy to turn. I also modify them to reduce side-to-side and up-down movement, which should also prevent the edge of the rotor cutting the conductive tracks if the knob is turned while downwards pressure is applied. This was the main failure mode of the original ALPS pots. Nonetheless, please try not to apply downwards pressure on any TB-303 or TR-606 small pots while turning them.
The Tempo and Volume pots rarely fail, but I can replace them. I usually fix a noisy volume pot by dismantling and cleaning it. The two rotary switches have never failed, in my experience.
I now have a technique for spray painting the parts of the case which are worn around the 6 small pots. Where the markings and silver paint are worn away, I can spray some silver and by hand colour in new markings. Please see the refurb/ page for more on this.
Two further options are:
3.5mm Headphone Socket. In the Devil Fish, the old headphone socket is used for Audio Out from Filter (ring) and Audio In for Frequency Modulation of the Filter (tip).
With this option, the original headphone amplifier, with its 10 ohm drive resistors for left and right channels, is connected to a 3.5mm socket located above and between the Power and Audio Out sockets.
Switch for Audio In to Filter. In the Devil Fish, the old Mix In socket is used for feeding an external audio signal into the filter, in addition to whatever amount of the Oscillator is selected by the Overdrive pot. Since this pot can be turned down to zero, it is possible to run the machine without its internal oscillator and have the Filter processing purely an external signal.
With this option, a three position toggleswitch is mounted between the Tempo and Track-Pattern Group knobs. It has three positions:
Audio In enabled.
Audio In disabled.
Audio In enabled, but spring return to Mid position.
This enables convenient switching of the external signal, including dropping in short bursts of it by pressing the switch to the down position, with the toggle returning to the mid position as soon as the finger pressure is released.
Martin Rothlisberger in Switzerland http://acid.ch makes magnificent Anodized Aluminium cases for the Devil Fish, replacing the ABS silver plastic cases which are now at least 30 years old. The email address link at that site is bodgy. Here is the proper email address:
email@example.comAluCases are machined from solid billets of aluminium. No matter how they may be banged around, dropped etc. the case will be practically indestructible, so providing good protection for the TB-303 and Devil Fish electronics for the decades and centuries to come.
Martin has a small stock of partially completed AluCases and will finalize, anodize and apply the epoxy paint to the lettering according to your specifications. There is a wide choice of colours for the anodizing and the epoxy paint. Please see the photos/ directory for images of some AluCase Devil Fishes.
There are extra costs installing the machine in an AluCase, and some extra shipping costs due to the extra weight and the larger carton we use. The extra costs approach AUD$2000. It is generally best for the customer to work with me regarding the options they want for their Devil Fish, and then for me to communicate this to Martin, with the final choices about colours and lettering being between the customer and Martin. Generally it is best for the customer to pay Martin directly, but if necessary I can handle the whole project from a single payment. It is best to allow at least six months for Martin to complete the AluCase and ship it to Australia.
Martin is a DJ and Devil Fish musician himself. Please see the videos/ directory for him and the Liquid Trolls in action.
Please see midi-options/ for further information on these MIDI In/Out systems:
The Devil Fish MIDI In and Out system.
The Quicksilver 303 CPU replacement from Social Entropy in Texas.
Click for larger version.
The Devil Fish is the most dynamic, pulsating, wailing musical instrument I know of. If you and your TB-303 have a sense of adventure, the Devil Fish modifications will propel you into musical territories dark, destructive, delicate, languid, undulating, exquisitely detailed, throbbing, luscious and lurid . . . . . Best of all, the spaces between these extremes can usually be traversed by judiciously turning a few knobs.
Tina's illustration on the Devil Fish job progress book.
Artist Robin Whittle Uniform Bass Code Charles James Linxstar Track Melodic pulsations & knobulations acidtrax2-edit cj03 Devil Fish with Mooger- Fooger Time 1.44 1:06 1:00 2:40 MP3: rw12.mp3 cw-acidtrax2-edit.mp3 cj03.mp3 Linxstar- Devil-Fish- Mooger-Fooger- edit-excerpt.mp3
24 minutes of sound samples are in the sounds/ directory.
Peter in the Netherlands has some MP3s of music he made with his Devil Fish: tek.tekmac.nl
(Translation from Strine: "How much is it?" "Strine" is Strine for "Australian". )
prices-au/ Prices for customers in Australia.
prices-int/ Prices for customers outside Australia.
The basic modification cost includes cleaning the machine and a moderate level of repair work.
There is no extra charge for removing the Kenton CV socket kit. (The Devil Fish performs all the functions of that kit, except that the Kenton kit automatically deactivates the internal sequencer's accent state, and the Devil Fish Version 2.1D and beyond enable a high Slide input voltage to drive the gate, in order to "tie together" notes which have separate Gate pulses.)
If you have a Devil Fish version 1.x (1993) 2.x (2006 onwards) or 3.x then I can upgrade the machine to the current 4.2 version with MIDI. It is not possible to install the MIDI In system with these older Devil Fish circuit boards. This replaces the existing Devil Fish circuit boards, so your machine will have 7 new small black pots with silver lines and three new toggle-switches in the Devil Fish panel, with new CV, Gate etc. sockets at the rear.
If your machine is one of the few version 4.x machines without MIDI, the upgrade can be done with the existing circuit boards, to MIDI In or to MIDI In and Out.
If you have a 4.x Devil Fish with MIDI In, I will be able to extend this to provide MIDI Out as well. If it is an earlier version than this, then the Devil Fish boards need to be replaced with those for version 4.x.
In general, we don't sell spare parts. Please see http://technologytransplant.com for many specially manufactured parts for electronic musical instruments, including new battery contacts and battery compartment doors for the TB-303 and TR-606.
Before mid-2010, I replaced the tact switches with the original type, ALPS SKHCAA (now known as SKHCBEA010). These were not sealed against dust. Dust (mainly flakes of skin . . .) gets into the switch and builds up on the contacts, making the switches operate erratically. I installed them with a flexible plastic dust guard, which greatly prolonged their life. Still, after 10 years, some heavily used machines needed their switches replaced again. There are sealed tact switches from ALPS (SKQEAAA010), but I don't like them since they have a higher activation force, a much lower lower "click force" and a much lower "click displacement". Please see tact-switches/ for details.
The only alternative is to use Omron B3W-4050 sealed tact switches. These are pictured above: #pots_switches. These are slightly firmer than the SKHCAAs, and have about the same initial and click displacements – so they have a very good "click" action. The Omron switches have stems which are a little too wide for the TB-303 / TR-606 buttons, so I modify the stems to make them fit the buttons. This is done with a 0.6mm Dremel cutting wheel, with two cuts at right-angle through the top part of the stem.
While we can't guarantee these switches for any particular period, they are very well made and well sealed against dust and liquids. They are specified to have a life of 3,000,000 operations. Dust seems to be the only thing which makes tact switches erratic, and there's no way dust can get into these Omron switches.
The page 303-mods/ discusses how to obtain the Omron switches and how to to modify them so they fit the TB-303 buttons. To support people with the task of replacing these switches, but who do not want to modify the switches themselves, we are now selling Omron switches, with their stems modified to suit TB-303 TR-606 buttons. Each pack contains 25 switches. The TB-303 needs 24 and the TR-606 needs 21. Australian customers please email us. Overseas customers, please use PayPal to send Australian AUD$90 for one pack, or AUD$160 for two, to firstname.lastname@example.org . We will airmail them to you within a few days, so you should have them within two weeks at most.
Tina and I aim for a three week turnaround time between you, the customer, sending your TB-303 and receiving it back as a Devil Fish. However it is best to allow four to six weeks. (However, in late 2014, I am working on a backlog of work, so the principle of four to six weeks applies only once I am caught up.)
Please email us with your requirements and we will reply with the full pricing information, shipping address etc. I suggest copying and pasting from one of the Prices pages linked to from above: #emma, retaining only those lines in your email which are relevant to your desires.
Please send the TB-303 with a reputable courier company, rather than by the post. TNT, DHL, Federal Express and your Post Office's EMS service are all good choices.
The German Postpak service and a similar service from the Belgian Post Office is not a courier service and should not be used. Despite assurances about tracking numbers and someone having to sign for delivery, it will be delivered in Australia as an ordinary parcel. This means it may be left on our doorstep. Ordinary airmail with the recipient having to sign for the package is not secure enough for an item such as a TB-303. Post Offices in many countries deliver their packages not through the Post Office of the destination country, but by various transport companies. Australian truck drivers won't understand instructions in French regarding the recipient signing for the package.
Please send just the TB-303 – no batteries, vinyl carry case, or original styrofoam/cardboard box. Batteries should only be included if you do not want the 32 banks of memory and you wish to retain the existing memory contents, or if you want the existing patterns to be transferred into the Quicksilver 303 system (see midi-options/). Memory contents cannot be retained if the 32 bank system is installed, and I can't absolutely guarantee that patterns will be retained if the memory is not installed, so please write down all important patterns before sending the machine for modification. The patch-sheet/ directory has some PDFs to help with this.
We will ship your Devil Fish via TNT. The modifications are very reliable and are guaranteed for two years. We normally insure the package for AUD$2000. No machine has been lost or damaged of the 200+ machines we have shipped to overseas owners since the early 1990s.
Other information at this site
It is generally best to enquire via email: email@example.com. We are located in Daylesford, about 120km north-west of Melbourne: Wikipedia, Google-Maps.
Sound Samples These are in the sounds/ directory. Videos There are an increasing number of YouTube videos depicting Devil Fishes, including some live acideee action by Martin Rothlisberger (Liquid Trolls) who makes the AluCases. See the videos/ directory.
Martin Röthlisberber in Switzerland http://acid.ch custom-makes AluCases for TB-303s and Devil Fishes. These are machined from solid billets of aluminium. They are anodized and the engraved lettering hand-painted with epoxy paint. See #alucase above for more information.
Q1: "Can the Devil Fish still make the sounds of the TB-303?"
Yes. See page 7 of: Devil-Fish-Manual.pdf for how to restrict the Devil Fish to the TB-303 subset.
Q2: "Does the Devil Fish have MIDI?"
Yes – MIDI In. MIDI Out will soon be available. Please see the midi-options/ page for more information on this and an two other approaches to providing MIDI In and Out.
Q3: "Do you have any TB-303s for sale, or do I know of any?"
Sometimes. Please contact me if you wish to buy or sell a TB-303 and I may be able to put you in touch with someone. See above: #tb303sforsale .
Q4: "Are you going to make a standalone Devil Fish?"
One day. It is a very big project to do it as well as I believe it should be done.
Q5: "Is it OK if a TB-303 has the Kenton CV/Gate/Slide/Accent/Filter input sockets?"
Yes. Before doing the modifications, I remove the sockets, fill the holes with epoxy, paint them silver and then carefully drill the Devil Fish holes with my template.
Q6: "My TB-303s pots are stiff. Can you replace them?"
The 6 small pots (potentiometers Tuning to Accent) typically are rather stiff. This friction may be reduced if the pots have been used a lot and/or if the pots are warm. The friction in the pot is not caused by the wiper on the carbon track, but by a special part of the shaft rubbing on the case in the presence of high-viscosity silicone grease. By dismantling the pot, it is possible to remove that grease and replace it with less viscose silicone grease, which makes them move relatively freely. However I do not pull pots apart without good reason, because of the danger of damaging them.
Q7: "The TB-303's memory contains precious patterns. Will they still be there after the Devil Fish modification?"
I don't absolutely guarantee this, but I have procedures for retaining Lithium battery power to the RAM chips at all times, so your data should remain intact. Be sure to have four good C cells in the machine when you ship it. Take extra care with the packaging, especially to use tape, packaging or whatever to make sure that nothing can turn the Volume knob to the On condition. That would flatten the batteries. The patterns cannot be retained if the 32 bank memory system is installed. It is best to write your patterns down anyway. See the pattern sheets mentioned in the Other Information section above.
Q8: "Do you install Ultra Violet LEDs?"
No. UV LEDs produce very little visible light and plenty of UV, which may be damaging to the eyes – especially up close with the iris wide open in dark conditions.
Q9: "What about spare parts, repairs to Devil Fishes and TB-303s"
Certain parts are vital for the TB-303 and cannot be obtained from any source other than another TB-303. The problem parts are:
Q10: Other maintenance questions regarding knobs, pots, switches, contamination etc.
Never let anyone spray anything inside any equipment you care for!!! (With the possible exception of isopropyl alcohol if you really know what you are doing.) Many TB-303s have been damaged by people spraying oily and/or corrosive liquids inside them. It is possible to remove the oil – but only be removing some components and soaking the whole PCB in a hydrocarbon resembling petrol.
Please see 303-mods/ for more information.
Apart from the images of aquatic Devil Fishes, and the sound samples by other people, all material in this /rwi/dfish/ section of the web site is copyright 1996-2012 Robin and Tina Whittle. If you would like to use some of this material for your own purposes, please ask: firstname.lastname@example.org .
The photo at the top of this page is different for each day of the week. The photos are Devil-Fish-TB-303-front-panel-00.jpg to Devil-Fish-TB-303-front-panel-06.jpg .
If you wish to link to this site, please link to: http://www.firstpr.com.au/rwi/dfish/ and let me know. I will add your site to the links section.