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. MOSFETs were matched in accordance with standard operating conditions. This is enough transistors for 2 channels (one stereo amplifier).
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.
- The current batch of kits includes Harris IRFP9141 instead of the International Rectifier version. These have better distortion characteristics and are a sonic upgrade, but it should be noted they are rated for 100V.
- Any numbers on the MOSFETs are ID numbers only, and are not related to their measurements nor their matching
Excellent kit, service and delivery . Now working perfect in F4 .
Having the mosfets matched in advance is a times saver and worked out well repairing a F4 channel.
What more can I say? Support the site!
Great service! Parts arrived very quickly with everything accounted for. About to start my F4 build! Thanks DIYAudio Store!
Great to have matched mosfets.
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
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.
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