F-4/BA-3 Transistor Kit

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

59⁰⁰

Included in this kit are the semiconductors needed to complete an F-4 amplifier or BA-3 output stage, with the exception of the input JFETs. MOSFETs were matched in accordance with standard operating conditions. This is enough transistors for 2 channels (one stereo amplifier).

6 x IRFP 240 (F4 and BA-3)
6 x IRFP 9240 (F4 and BA-3)
2 x TL-431 (BA-3)

The IRFP9240/IRFP240 MOSFETs were matched at the rail voltage and current that the BA-3 and F4 articles suggest, specifically, 22v and .4A, and then grouped by VGS to within .1V.

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

Speedy delivery and as advertised

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Quick and Efficient

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

Excellent service

Great to have matched mosfets.

DAS -10469 received and DAS107 07 not received

Hello , I received the DAS 10469 with the delivery time indicated by your site. I didn't install the transistors yet but every thing seems in order. Concerning the DAS107 07. I still didn't received anything

Great service.

F4 Project

Got transistors and boards in four days. Built amp boards and power supply. The back panel kit didn't get restocked, so I bought parts elsewhere. Used 4U Deluxe Chassis. Comments on that under its heading. Worked immediately on power up.

Update

I received a refund for the defective transistors. DIYaudio was very understanding. I think my experience was just a bit of bad luck.

Have not opened

Appears to be correct parts. I have not even broke seal on package yet. Likely not starting until winter when I have more spare time. Lots of parts needed on site not available at this time so I will be patient.

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