Most vintage synths on eBay are listed at a fixed Buy It Now price, so you can't shave a low bid to cover your risk. What protects you is the listing itself. eBay's Money Back Guarantee covers an item that doesn't arrive, is faulty or damaged, or doesn't match the listing, as long as you completed and paid for the purchase on eBay. The more specific a seller is about condition, the more you can hold them to. Here's how to read a listing before you pay, and what to ask for when it's vague.
What "powers on" and "tested" tell you
The words a seller picks tell you how far they got.
- "Powers on" means the lights came on. It says nothing about whether every key, voice or drum sound works.
- "Tested" or "works" means more, but ask what was tested. A seller who played every voice and every key will say so.
- "Untested" or "from an estate" usually means the seller can't play it or had no way to check. Treat it as not working until a video shows otherwise. eBay has a For parts or not working condition, and some listings that belong there aren't in it.
- "Serviced" or "recapped" needs a who, a when and a what. Our service guide lists what a real service record covers.
A specific listing reads something like "all six voices play evenly, battery replaced last year, keys cleaned". That seller has used the synth. If all you get is "great condition, works great", ask before you buy.
Photos that should be there
Stock photos, or one dim shot from across the room, are the biggest single warning. You want pictures of the actual unit.
- Every side, including the ends and the bottom, where drops and missing feet show.
- The back panel, with the serial number and the power rating plate readable. Roland's Juno-106 manual sends owners to that name plate to find the right power supply, and you'll need it to judge the voltage.
- The unit switched on, with its display or LEDs lit.
- The inside, if the seller will open it, especially the part most likely to fail on that model. That's the KLM-367 board in a Polysix or the battery compartment under a TR-808.
The serial number matters beyond proving the photos match the unit. It can place a synth within its production run. A Sound On Sound review notes, for example, that Minimoogs with serial numbers above 10175 have a different oscillator card design. If the serial plate is cropped out or blurred, ask for a clear shot.
Listings that borrow a famous name
Search for a classic and you'll get plenty that isn't it. When we searched eBay for the TR-808 in October 2026, originals were mixed in with Roland's TR-08, a miniature 808 released in 2017, Behringer's RD-8 from 2019, third-party clones, TR-808 sound chips for other drum machines, service manuals, dust covers and framed prints. A TB-303 search turned up Roland's TB-03, third-party clones, carry cases, owner's manuals and protective skins alongside the real thing. Behringer also makes a TB-303 recreation, the TD-3.
Software is the other trap. Plug-ins modeled on the CS-80, the Prophet-5 and other classics carry the original's name, and so do sample packs. Read the whole title, then check the condition field, the item specifics and every photo for what's actually in the box. A listing for a license, a download, a ROM chip or a manual can still rank high in a search for the synth.
Check the voltage
Many of the vintage synths on eBay US ship from Japan, where mains power is 100 volts. Japanese plugs fit most American outlets without an adapter, so nothing stops you from plugging a 100-volt synth into a 120-volt wall. Sellers in Japan often put "AC100V" in the title, and units from the UK, Europe or Australia may be built for 230 or 240 volts. Read the rating plate in the photos and ask if it's unclear. Our voltage and shipping guide explains what to do with a mismatch.
Ask for a demo video
A short phone video does more than any description. Ask for it before you pay, and be specific so the seller knows what to film.
- Polysynths: single notes up the keyboard, then a held chord, so you hear each voice. Then a slow filter sweep.
- Monosynths: every key from bottom to top, then a slow turn of the filter and each knob.
- Drum machines: each instrument on its own, every step key, and each level and tuning knob turned while a pattern runs. A TR-909 has MIDI, so a seller can also show it playing from a keyboard.
- Anything with memory: switch it off, wait a minute, switch it on and call up a saved patch. If the sounds survive, the backup battery is holding.
- FM synths like the DX7: soft and hard playing on the same key, since its keyboard is velocity sensitive. For a TX81Z, which has no keys, ask for a clip played from a MIDI keyboard.
A seller with a working synth can film this in a few minutes. If they won't, move on to the next listing.
The seller and the deal
Check the seller's feedback count, the positive percentage and what they've sold before. A long record of selling music gear is reassuring. A new account or a low positive score on a collector-grade synth deserves extra questions. Pay through eBay's checkout, and never by a direct transfer the seller suggests, because the Money Back Guarantee only covers purchases paid for on eBay. Many listings carry Best Offer. Use what the photos and video show, like an old battery or a voice that needs work, to make a fair offer.
Packing
Ask how it'll be packed before you pay. You want the synth in its own box or case, inside a second box with cushioning all the way around. FedEx's guidance is 2 to 3 inches of cushioning on all six sides. A heavy keyboard in one thin box is a real risk. Ask for batteries to come out, too. Roland's SH-101 manual warns that batteries can break out of their housing in transit, and the TR-909 manual warns that cells left in can leak.
