We offer sales and limited service of vintage 4-Track cassette recorders. We also offer a few after-market parts that have been developed in-house when needed.

Contact us through the contact forms for inquires about sales and servicing. We are located in San Francisco, CA.

What’s usually included in our restorations as needed:
  • Changing the belts with high-performing belts
  • Calibrating the tape speed
  • Cleaning the tape heads
  • Demagnetizing the tape head
  • Oiling the capstan bearing
  • Removing and replacing any dried grease
  • Cleaning knobs and sliders with contact cleaner
  • Finding and repairing any loose solder joints
  • Replacing capacitors if need. Eg for dead audio playback
  • Cleaning the inside and outside
  • Replacing any missing parts with original or after-market parts
  • Applying rubber renue to pinch rollers or idler tires to extend life
  • Replacing a pinch roller if it has any deformation
  • Replacing or restoring a motor
  • Replacing broken gears
  • Testing recording and playback on all channels




New Repair Intake Form
General Contact Form


Some models that will be ready soon:

It’s difficult to keep this list up to date. The best thing to do is to reach out to me and let me know what you’re looking for. Chances are I have one on my shelf, and I can prioritize it and get it ready for sale.

- TASCAM PORTA02 MKII
- TASCAM PORTA03 MKII
- TASCAM 424 MKI
- TASCAM 424 MKII
- TASCAM PORTA TWO
- TASCAM 464
- TASCAM PORTA05
- TASCAM MF-P01


Listings can also be found on the FunctionalTechSF Reverb Store, but items can also be purchased at a discount by using the contact form.