“1u 8 Voice Multi-Timbral 4 operator FM synth with 2 outputs for stereo or 2 separate combinations of the 8 voices. 128 preset sounds, 32 user or use a patch librarian and have as many as your hard drive can hold. MIDI delay and reverb effects. Micro-tuning, detuning, splits, and layers. I’ll include an EPROM with last firmware revision (1.6). Lots of editors and controllers available for these now. ” Click here to search for synths on eBay
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“legendary vintage 80-90’s YAMAHA TX81Z FM Tone Generator sound module in good working and condition ”
“Beautiful condition Yamaha TX81Z.
“Used untested unit does power on.”
“Yamaha TX81Z FM Tone Module. Very good condition. Fully functional.” 
“This is a good Yamaha TX81Z FM Tone Generator. Everything works fine on it. It has been fully tested. There are some scratches here and there and one rack ear was bent and straightened out, but is full functional.” 
“nice pre owned condition
“Up for sale a very cool Yamaha TX81Z fm synthesizer rack module. Fully functional and in good cosmetic condition. The attack is super fast, sharp bass sounds that are great for layering along analong synths. The pads sound like aphextwin or some e.b.m style basslines. This is a 4 operator fm synth and I’m sad to see this one go. Sold as is no returns accepted. Ships via UPS” 
“The item is shown in the rack near the top. It’s in perfect working order! No issues!”
” The outer case isn’t so pretty, but it sure makes some warm and pretty sounds! 8 Note polyphonic FM tone generator. Rack Mount module. Works great! Well cared for in non smoking environment, one owner. All the scratches are from moving from one rack/position to another.” 
“Rack mounted MIDI sound module that I purchased new in the 80s. It was never used professionally, always in my home. Works perfectly and in excellent condition with only light scratches on the top surface as shown in the photos. Pull out card is also in perfect shape. ” 
“Here we have the legendary Yamaha tx81z
“Item comes as is in the pictures . Power is on . No sounds.”
“Yamaha tx81z FM Rack Synthesizer with X81pg programmer — In good condition! 100% functional! Some buttons on tx81z are a little sticky(due to age) but work fine. The left rack ear on the tx81z is bent a little but does not prevent easy racking and definitely does not effect functionality.
“Used Yamaha TX81Z. Works and has Patchman Volume 3 Patches for Wind Controller installed in User Bank. Right Rack Mount Tab is bent.”
“This listing is for one Yamaha TX81Z. I bought it in 1990 from a fiend who was the original owner and it has had minimal use and movement since then. I have thoroughly tested and assessed it. My description is accurate and I’m selling it as is with no returns. The two flaws that I found do not affect the performance of the unit at all. At some point the power cord was nicked a few inches in from the plug and the outer jacket had a small breach. The inner wires have their own jackets and they were completely intact. I covered the spot with electrical tape and checked for any shorting or noise by bending the cord in every direction at that spot and it is totally sound.. The other issue is that there is a slight hum coming from the unit itself when powered up but it does not come through or affect the audio outputs at all. ”
“Vintage YAMAHA TX81Z FM MIDI Tone Generator Synthesizer Rack. Initializes & seems to work ok. May need a new battery but they are easy to switch.
“Yamaha TX81Z Frequency Modulation Music Synthesizer
“Up for sale or best offer is a Yamaha TX81Z FM Tone Generator Synthesizer module.
“Tested – Fully functioning – Some scuffs and wear from being rack mounted. Works just like it was 1987.”
“Yamaha tx81z. Condition is Used.” 
“Great unit! Yamaha TX81z Synthesizer Module True Vintage FM Synthesis! Preset card still attached! Great condition!”
“Up for sale is a Yamaha fm tone generator.
“Reasonable condition. A few scratches and a small dent on the top casing, but works OK.
“This unit is in very good condition, has not been on the road, and has spent its life in a smoke free/pet free/kid free home. I am the original purchaser/owner. I enjoyed using it, but never did use it heavily. This sat in the closet the last 20 years since I use a different keyboard. It’s in very good condition, minimal scratches or scuffs, and even still has the slide-out preset guide card. (see pictures)
“Up for auction is a Yamaha TX81Z FM Tone Generator Synthesizer Rack Mount. Comes with manual. Works great, has cosmetic wear which is shown in pictures.”