FET/500
Revision D

$425.00

The Blackface

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

This revision covers the REV B thru E units. Most current reissues are based on this revision. Revisions C-E had a blackface front panel while the Rev B retained the silver and blue stripe panel. Changes were made to the stage and line amps so a bipolar transistor was used as the first active component. Low noise, or “LN” circuitry, was added to this and all future revisions. Like the Revision A, the input uses an O-12 transformer and the signal is attenuated at the input with a 600Ω t-pad. The output is class A, utilizing a 5002 output transformer. This is widely considered to be the most classic FET compressor sound.

Recommended for intermediate builders.
  • All the parts needed to complete the build
  • Black 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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