RILEY XB 30 combo

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Hallo ! This is a small combo solid state amp with two BD241 NPN
powertransistors . The amp could be 30 years old ... I´d be very happy

for a schematic or where to find one . It´s very timeconsuming to try to

draw a schematic as some transistors is difficult to "read" . Now the amp is humming and only one powertransistor is leading current and the other is
not ....... this when a speaker is connected . with no speaker connected,
the + and - voltages are similar ...... balance is OK. Have a 25W/230VAC

bulb ( lamp) in series with the mainvoltage to protect the amp from futher
damages....

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Topic - RILEY XB 30 combo - Stewen 09:12:27 10/11/16 (0)

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