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 form 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 reparing 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


Contact Form

Up to date listings can also be found on our Reverb Store (https://reverb.com/shop/functional-tech-sf), but items can also be purchased at a discount by directly contacting me. 


Some models that will be ready soon:
- TASCAM Porta02
- TASCAM Porta03 mki
- TASCAM 424 mki
- TASCAM 424 mkii
- TASCAM Porta Two
- TASCAM 464
- TASCAM 488

Sold (incomplete list):
- 9/24 TASCAM Portastudio 424
- 9/30 TASCAM Porta02 mkii 
- 10/9 TASCAM MT1X 
- 10/11 TASCAM 424 mki 
- 9/27 TASCAM Porta03
- 10/28 TASCAM 424mkii
- 10/28 TASCAM 644
- 11/28 TASCAM 424 mki 
- 12/1 TASCAM Porta03 mki 
- 12/2 Porta02 mk1 
- 12/6 TASCAM Portastudio 414 mki 
- 12/10 TASCAM Portastudio 414 mkii 
- 12/15 TASCAM 414mkii
- 12/24 TASCAM Porta02 mkii 
- 12/25 TASCAM 424 mkii
- 1/4/2026 TASCAM 424mkii
- 1/14/2026 TASCAM MF-P01 
- 1/17/26 TASCAM Porta02 mkii