The Drip 660 and 670 PCBs are exact replicas of the Fairchild 660 (mono) and 670 (stereo) comp/limiters.  To quote the Drip website, “THIS IS THE FAIRCHILD CIRCUIT.” Like the originals, the Drip 660 and 670 use ten transformers and twelve tubes in the signal path for each channel. Drip Electronics offers PCBs and support for this project. With five power transformers to wire and up to 440v power lines, this build is emphatically for the experienced and committed.

Notable Features:

• Tubes used:
  • 1 12BH7A
  • 1 12AX7A
  • 2 6973
  • 4 6386
  • 1 GZ34 (5YGT3)
  • 1 EL34
  • 1 5651
  • 1 6084
• Uses Sowter’s Fairchild replica transformers
• Can be built as either a mono 660 or stereo 670 (two PCBs)
• Four layer PCB isolates ground, audio, and power circuits
• All-tube power supply

Price:

• $300 for 660
• $400 for 670

Adjusted Price: $2,300 for 660, $3,600 for 670

Estimates posted by Drip on his forum.

See and hear it in action:

For more information visit www.dripelectronics.com.