F-4/BA-3 Transistor Kit
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, which can be sourced separately through the store. MOSFETs were matched in accordance with standard operating conditions. This is enough transistors for 2 channels (one stereo amplifier).
6 - IRFP 240
6 - IRFP 9240
2 - TL-431
The IRFP9240/IRFP240 MOSFETs were matched at the rail voltage and current that the BA3 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
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.
I received a refund for the defective transistors. DIYaudio was very understanding. I think my experience was just a bit of bad luck.
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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