Optimus ConcertMate 990 Keyboard (aka Casio CTK-601)

This vintage keyboard is in very good condition. There are a few minor scraps as noted in pictures. Please review them all to be aware of condition to your standards. Everything works when tested. All 61 keys working, speakers sound great, power button works, volume clean up and down ... all jacks and buttons appear clean and operable. Did not test midi or output jacks due to limitations on my test equipment.

Tested working with OEM/original radioshack 9v AC adaptor which is included.

During testing, sound was good and clear and volume plenty loud even on lower settings.

This is a truly classic keyboard with 200 tones but particularly loaded with SYNTH tones. Not your usual 3-10 synths presets, but Loaded with tones 128-159 all synth presets and if thats not enough 168-199 are your own user creations!

This Concertmate 900 (radio shack rebadged Casio CTK-601) keyboard is a vintage 61-key electronic instrument that is perfect for producing grand piano music. With the ability to create a range of sounds and effects, this keyboard is suitable for musicians of all levels. This is a reliable choice for any musician. The keyboard is in great working condition and has been well maintained over the years. It is an electronic keyboard that can be used to produce a wide range of sounds, from classic piano sounds to more modern synth effects. Whether you are a beginner or an experienced musician, this keyboard is a great choice for your musical needs.

reverb owner#1

"The best Casio of this type I have come across. This thing has aftertouch and a rudimentary synthesizer section that can be applied to any of the sample based sounds. The envelope applies to amplitude. The pitch settings go through various vibratos from subtle to jumping between octaves for some way out there sounds, or choose subtle pitch envelopes. There are also pitch up and down buttons that act as a pitch wheel. While this won’t complete with a fully featured synth, it can make sounds I haven’t heard from any other keyboard.  5 pin MIDI in and out. Clean battery compartment."

I specialize in selling vintage keyboards and make sure everything works and they are packed like they were my own . This one is a great model in bang for the buck, and in very good shape for its age.