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Please note: the numbers on the MOSFETs are ID numbers only, and are not related to their measurements nor their matching
Please note: the numbers on the MOSFETs are ID numbers only, and are not related to their measurements nor their matching

F-4/BA-3 Transistor Kit

Part of the F4 project
Choose ConfigurationCurrently Selected: Transistor Kit
Essentials Kit
$ 80.00 USD
Circuit Boards
$ 25.00 USD
Please note: the numbers on the MOSFETs are ID numbers only, and are not related to their measurements nor their matching
Transistor Kit
$ 59.00 USD
$ 59.00
  • Description
  • Project Info
  • Links

Included in this kit are the semiconductors needed to complete an two channels of the F-4 amplifier or BA-3 output stage, with the exception of the input JFETs. 

  • 6 x IRFP 240 
  • 6 x IRFP 9140
  • 2 x TL-431

Please note: 

Any numbers on the MOSFETs are ID numbers only, and are not related to their measurements nor their matching

Photos include parts available at the time of publishing. Individual components are subject to change based on availability.

 

F4 Project

  • Power Amplifier
  • Designed by Nelson Pass
  • Intermediate Difficulty
  • Basic Build Guide
  • Only Essentials Kit Available
Contributors

Visit the F4 project page for more information about this project.

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F-4/BA-3 Transistor Kit

$ 59.00 USD

Note - Photos include parts available at the time of publishing. Individual components are subject to change based on availability.

Customer Reviews

Based on 12 reviews
83%
(10)
17%
(2)
0%
(0)
0%
(0)
0%
(0)
P
PAUL R.
Nice Build

F4 is a great sounding amp and a fairly straightforward build. Only issue I had was a slight mismatch in the Mosfets that showed up measuring bias across the 0.47 ohm resistors. No idea how common that is but fixing it required swapping two mosfets. If you have the ability to match test the mosfets before installing I suggest you do that otherwise you may have to desolder and reinstall them to get a better match. Also, strongly recommend using a 7-8K resistor for R9 instead of the 10K that is specified in the BOM. I wasn't able to bias one side high enough with that 10K resistor.

N
Nikolaos K.
Excellent kit

Excellent kit! My F4 works great! Thank you!

A
Anders A.
F4 Transistor kit review

Excellent kit, service and delivery . Now working perfect in F4 .

V
Vince
Time Saver

Having the mosfets matched in advance is a times saver and worked out well repairing a F4 channel.

A
Adrien T.
Speedy delivery and as advertised

What more can I say? Support the site!

R
Robert G.
Quick and Efficient

Great service! Parts arrived very quickly with everything accounted for. About to start my F4 build! Thanks DIYAudio Store!
Rob G

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