Revision F


Message About Price Increases

The Silverface

This unit was offered in a black panel and a silver front panel similar to the Revision A but without a blue stripe. The major change to the revision F was the redesign of the output stage from class A to a 1109 style class AB “push/pull” output, utilizing a B11148 output transformer to provide more gain. Like the Rev A and D the input uses an O-12 transformer and the signal is attenuated at the input with a 600Ω T-pad. We believe the Revisions F is highly underrated and when given a 2:1 ratio becomes one of the more usable compressors we’ve heard. 

Recommended for intermediate builders.
  • All the parts needed to complete the build
  • Clear anodized front panel made in Seattle, USA
  • PCB L-bracket made in Seattle, USA
  • Custom Ed Anderson O-12 reproduction input transformer made in the USA
  • Custom Ed Anderson 5002 reproduction output transformer made in the USA
  • Custom T-Pad input attenuator
  • Grayhill ratio rotary switch
  • BI260 potentiometers
  • Fully discrete audio path including capacitors selected by ear from Kemet, Nichicon, Panasonic, Vishay, United Chemi-Con and Elna
  • Bourns trimpots
  • 1% metal film resistors
  • Matched FETs
  • Machined aluminium knobs
  • Customers who order two kits will receive stereo matched FETs and a link cable


Build Support Services

We got your back! We offer flat rate repair on all of our DIY builds if you get stuck.

Get info on Build Services

Stay updated & informed

Receive product updates and DIY Tips.