Sequential Circuits Six-Trak

“For sale is a vintage Sequential Circuits Six-Trak. The Sequential Circuits Six-Trak Polyphonic Synthesizer may be labelled as a “beginner model” by the company, but the features and functionality make it a prime choice for any synth enthusiast. Built with 48 velocity-sensitive keys and the same Curtis circuitry found in the company’s more expensive models. This Six-Trak exhibits some heavy cosmetic wear like rusting on the chassis and scratches on the side wooden panels. It’s not in the prettiest cosmetic shape, but it is completely functional and works perfectly.” Click here to visit listing on eBay

Sequential Circuits Six-Trak

” I originally bought this to do a full restoration on, but other things have come up and I must pass this on to someone else

Here are a few things that need to be brought to attention:

The previous owner had used wire nuts to connect the power cord adapter. I would not recommend keeping it like this as you could pull the wires apart if you put enough stress on the cord! I am including a pair of power cord secure fastener pieces (see pic).

All the rubber key bushings had dry rotted and had to be removed. I actually could not find a source yet to replace them or come up with a better solution maybe. I have been plugging a midi controller in and playing the synth as a module. You can still play these keys, but they feel really bad without the bushings. Plus, you could scratch the keys on the bottom as they are coming into contact with metal.

I soldered in a CR type battery holder. I was able to load a sysex of the factory patches via midi and everything worked great!

The modulation wheel seems to not be working at the moment. While this synth sounds great I have noticed a strange sound introduced when you turn the track volume and speed volume knob.

I had to replace a knob and it sticks up a little higher, but works fine. The record LED had to be replaced and is a little brighter than the rest. It’s fine cuz it doesn’t stay lit long. You use it for control functions (see manual)” Click here to visit listing on eBay

Sequential Circuits Six-Trak

“I originally bought this to do a full restoration on, but other things have come up and I must pass this on to someone else

Here are a few things that need to be brought to attention:

The previous owner had used wire nuts to connect the power cord adapter. I would not recommend keeping it like this as you could pull the wires apart if you put enough stress on the cord! I am including a pair of power cord secure fastener pieces (see pic).

All the rubber key bushings had dry rotted and had to be removed. I actually could not find a source yet to replace them or come up with a better solution maybe. I have been plugging a midi controller in and playing the synth as a module. You can still play these keys, but they feel really bad without the bushings. Plus, you could scratch the keys on the bottom as they are coming into contact with metal.

I soldered in a CR type battery holder. I was able to load a sysex of the factory patches via midi and everything worked great!

The modulation wheel seems to not be working at the moment. While this synth sounds great I have noticed a strange sound introduced when you turn the track volume and speed volume knob.

I had to replace a knob and it sticks up a little higher, but works fine. The record LED had to be replaced and is a little brighter than the rest. It’s fine cuz it doesn’t stay lit long. You use it for control functions (see manual)

This little beast weighs about 16 lbs. I will pack and ship with the utmost care.” Click here to visit listing on eBay

Sequential Circuits Six-Trak

“Just serviced and cleaned, with a new output jack installed.

Everything works, but some of the number buttons are still a bit touchy.
The 7 button in particular is prone to double triggering. To me, these are minor
issues, and do not substantially interfere with the operation of the instrument.
I will leave it up to the buyer’s discretion as to having it looked at again.

The wooden end caps were replaced some time before it came into my possession.” Click here to visit listing on eBay

Sequential Circuits Six-Trak

“Sequential Circuits Six-Track Classic Vintage Analog Synth built in 1985.

Six classic oscillators which can run in polyphonic mode or unison for amazing thick layered sound.

Recently serviced and fully tested. Works beautifully and looks good cosmetically too. No rust. A few slight marks and dings in the wood and some very minor marks on a few keys.” Click here to visit listing on eBay

Sequential Circuits Six-Trak

“Sequential Circuits Six-Track Classic Vintage Analog Synth built in 1985.

Six classic oscillators which can run in polyphonic mode or unison for amazing thick layered sound.

Recently serviced and fully tested. Works beautifully and looks good cosmetically too. No rust. A few slight marks and dings in the wood and some very minor marks on a few keys.” Click here to visit listing on eBay

Sequential Circuits Six-Trak

“Sequential Circuits Six Trak Vintage Retro Electronic 80s Synth Synthesizer.

IMPORTANT PLEASE READ CAREFULLY

This synth is in good cosmetic condition apart from a small rust patch at the back.
On the front the sequential circuits sticker, the last few letters of ‘circuit’ has peeled off.
NO ACCESSORIES OR ORIGINAL BOX.

2 of the knob covers are missing, the unit can still be operated without them. I imagine replacements are easily obtained on ebay.

I am not experienced in programming this synth but I have tested as much as I can.” Click here to visit listing on eBay

Sequential Circuits Six-Trak

“For sale is a vintage Sequential Circuits Six-Trak. The Sequential Circuits Six-Trak Polyphonic Synthesizer may be labelled as a “beginner model” by the company, but the features and functionality make it a prime choice for any synth enthusiast. Built with 48 velocity-sensitive keys and the same Curtis circuitry found in the company’s more expensive models. This Six-Trak exhibits some heavy cosmetic wear like rusting on the chassis and scratches on the side wooden panels. It’s not in the prettiest cosmetic shape, but it is completely functional and works perfectly.”
Click here to search for synths on eBay

Sequential Circuits Six-Trak

“Sequential Circuits Six-Trak 6 Voice Analog Polyphonic Synthesizer w/ Programmer.

In great condition. Recently serviced by previous owner. Synth works great! Keypad can be a little hard to operate but is to be expected of a keyboard this vintage.

However, you won’t really need the keypad with the addition of the programmer! I will include instructions on how to use. This really unlocks this synth’s potential.

You’ll own one of the greats! This synth’s brother is the Prophet 5. It’s filter sounds unlike anything else. This is a killer synth. Has the warm analog sound that we all go after as synth heads!” Click here to search for synths on eBay

Sequential Circuits Six-Trak

“Just serviced by Greg Montalbano of Analog Synth Service in Oakland CA 2 months ago. Well known SCI tech. Here’s what has been done:

Replaced bypass caps, battery; cleaned pots, switches, key contacts; replaced key; reloaded factory data.

Fully functional! Some cosmetic flaws: one small chip on one key, some chips on the wood side panels, some marks/scratches mostly on the bottoms panel, side screws are not all the same. Check photos as it also described the physical condition of the unit” Click here to search for synths on eBay

Sequential Circuits Six-Trak

“Just serviced by Greg Montalbano of Analog Synth Service in Oakland CA 2 months ago. Well known SCI tech. Here’s what has been done:

Replaced bypass caps, battery; cleaned pots, switches, key contacts; replaced key; reloaded factory data.

Fully functional! Some cosmetic flaws: one small chip on one key, some chips on the wood side panels, some marks/scratches mostly on the bottoms panel, side screws are not all the same. Check photos as it also described the physical condition of the unit” Click here to search for synths on eBay