Klh model twenty plus

see if your manual is at this link.
Klh model 990A manual Google Search

I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.

http://www.audiocircuit.com/Home-Audio/KLH/CDR-1000

The mech binds up for age and lube hardening. Take it apart clean and relube it or have a pro like me do it for you. Larry 916-362-8708

I would check with KLH first but if you have no luck, you might try at Electronic Goldmine who will not likely have the exact knobs but may have some that will work:
Elec. Goldmine
Enter 'knob" in the product search window.

I have a universal remote that offers codes for KLH televisions. So, the odds are very good that you can use a universal remote that will operate it. Good luck!

You can address your question specific to your stylus to the manufacturer at this web page:

http://www.klhaudio.com/contact.html

Hope that helps!

Good luck!

press and hold menue button on the tv, for more than 10 seconds to unlock

speaker terminal is present in radio shack if you have technical background you can replace it easy otherwise you pass it to service technician.

I recently resolved CD-R recognition problems with the KLH CDR2000. It's absolutely imperative that you utilize CD-Rs bearing the logo "COMPACT DISC DIGITAL AUDIO RECORDABLE". These specific CD-Rs are designed for digital music recording with the KLH CDR2000 and other simular products. I have a Marantz CD20 that has the same CD-R requirement. I purchased a Memorex 50-pack from Best Buy for approximately $20.00 plus tax. The recordings with the Memorex CD-Rs are immpressive for the KLH CDR2000 given the obvious flaws in design. Again, when searching for compatible disc for the KLH CDR2000 look for the words "DIGITAL AUDIO" within the "COMPACT DISC RECORDABLE" logo.