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Yamaha Tx81Z



yamaha tx81z
audio demo trend price : 80€
manual factory patch demo video sample comments

Yamaha Tx81z - Multi Timbral FM tone generator (1987)  


A budget rack featuring a FM variation of traditional DX 6OP.

Budget spin-off from the famous DX7 FM synthesis, however the tx81z has some interesting technical improvement.

yamaha tx81z panel
tx81z technical data

info RACK (3.4 kg weight) a single black unit expander.
The front panel has an headphones out and 11 buttons for all the programming directly on a 2 * 16 lines LCD with active matrix; a bit hard to edit and no always so obvious to understand.
Back panel terminal connectors: double pairs of audio outputs (the second one has special audio routing patch in Performance mode), the Midi and tape interface for data storage.

ac Power supply is internal and some latest (or international) versions have a switch between 110v and 220V. CHECK voltage ANYWAY!!

edit VOICE
CPU is a HD63803XP branded Hitachi manages up to eight digital voices.
The traditional DX synthesis was based on a 6 operators system with just pure Sine waveforms and 32 combinations algorithms. The internal TX81Z chip YM2414B has only 4 OP and 8 combinations, on the other hand this YM system boasts 8 different waveforms: the standard DX Sinusoidal + 7 computer-generated harmonics variations with partials and fundamentals fixed settings, and like DX series each can be either Carrier or Modulator.

- Learn more about FM basic synthesis DX7


edit PERFORMANCE up to 8 parts each with independent settings including Volume, Midi Channel, Detuning, Effects (see below) and Pan position.
Performance part has also some factory playmode presets like 2 * 4 voices stacks or 8 * 1 monos: great for some thundering Lately bass sound! A special MONO play mode is available with Portamento and Glide time adjust.
The processor has some limits and cannot layer some particular algorithm combinations, also keep in mind that the Midi response has some freezes with data flows (depends also on the OS EPROM official from 1.0 to 1.6).

cem curtis 3372

lfo LFO two modulators (frequency range from 0.007Hz to 50Hz) with variable waveforms including Saw, Square, Triangle and Sample & Hold.
LFO modulate Amplitude- Pitch and feature some extra parameters like Delay Start or note Sync (modulation re-rigger).

adsr ENVELOPE four EG in total: each Operator has a single Amplitude EG (4-segments) + a general shift, plus a very simple Key Tracking Scale less complicated and effective than the one on the DX.

effect EFFECTS not a real DSP but faked simulated by Midi notes tricks reducing the (tiny) polyphony.
3* preset effects:
- Delay with pitch shift and adjustable Feedback.
- Pan moving: stereophonic path with follow velocity or LFO from left to right or vice versa.
- Chords with a maximum of 4 notes.

memroy MEMORY holds 128 ROM presets+ 32 ram users+ 24 RAM Performances. No external storage but full Sysex dump and edit by Midi or tape dump; note that MIDI Sysex strings are NOT compatible with 6OP DX line.

WARNING! Remember to do backups before any replacement attempt.

cem curtis 3372
battery soldered 3V Cr-2032

scales MICROTUNE the 4 OP structures has 13 different microtuning tables: 11 ROM preset + 2 users for non-standard intonation including Equal, pure, major-minor, Vallotti and Werckmeister.

tx81z demo

tx81z demo



TX81Z Trackdriver Presets Yamaha TX81z Yamaha TX81Z Performance Mode
TX81Z Trackdriver Presets Yamaha TX81z Yamaha TX81Z Performance Mode




sample download
free Tx81z sample pack! a little gift for you!
Free SF2 65mb sample pack!!! 4 patches: FM FARFISA, DX TINES, MELLOW SQUARE AND LATELY BASS

original scan


original scan



left side rack side logo printed


- today cheap
- variation of Dx7 FM
- sinus variation


- Edit
- midi buffer
- polyphony



"Totally aggressive digital sound at low price! needs a lot of time for programming and the awful interface can discourage noobs
Power for few bucks! ."



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yamaha tx81z 4 out of 5 based on 33 ratings. price €80