FET/500
Revision F

$425.00

The Silverface

This kit includes a FREE "All Buttons In" T-shirt. If you would like a free shirt, please email info@hairballaudio.com imediately after your order and let us know your size (S, M, L, XL).

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

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