October 6 2021 update: We should have another batch of FET/TACK kits around October 22.
Traditionally, the Revision F has a black faceplate and looks just like the Revision D. In many cases, original units are confused for Rev C/D/E's with engineers mistakenly thinking of the revision F as a silver faced unit. To give this underrated revision a unique look, we've added a red stripe and red off button cap. Though the Revision F is cleaner than the A or D, it's not dull or boring. In fact, it's the favorite of many at Hairball Audio. It imparts that classic FET compression while adding a glossy, polished sound to the source material. Frankly, it makes everything sound like a better version of itself. A favorite of top engineers, including Bruce Swedien, this is a flavor unique to the predecessors. Like the Revision A and D, 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/B, utilizing a B11184 output transformer.
Interested in a FET/RACK but not into DIY? Check out our list of kit builders.
We got your back! We offer flat rate repair on all of our DIY builds if you get stuck.
You should also check out: