While trying to repair an Onkyo TX9031RDS audio receiver, I found two transistors “RN1241” to be dead. Where can I find data or replacement types for these rare transistors?
RN1241 is a Toshiba muting transistor, rated R[on] = 1 ohm @ 5 mA Ib; it has an internal 5.6K (+/-25%) resistor going into the base (ECB pinout). Also, it has a high Vebo 25V, and high gain 200-1200, all making it hard to cross. If your Toshiba supplier cannot provide these, try getting Toshiba’s 2SC3327, which has similar specs but no base resistor, and then adding a small 5.6K resistor externally to the base. 2SC3327 is listed by MCM (800-543-4330), B & D Enterprises (800-458-6053), and Union Electronic (800-648-6657), among others.
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