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Old 1st May 2004, 01:55 PM   #1
malan is offline malan  Zimbabwe
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Post p400 382w8ohm

I'm afraid to use this amp with tip41-42c drivers under 2*65 volt dc.Because their limits are 115volts dc.
Can I use Mje15030-31 (or mje340-350 I know characteristics are different but...)as a driver for mj15003and15004

And is this a true way for bias setting of an amplifier;feeding the amp ,first disconnecting the output transistors voltages and setting the base voltages of output transistors to 0,5volt with bias trimmer without adjusting the current.Because mostly we dont know the current degrees of amplifiers.
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Old 2nd May 2004, 12:30 AM   #2
djk is offline djk
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The Vceo(sus) of the TIP41C/42C at IC=30mA is only 100V

With 10% saftey margin for line voltage variations you should run no more than 45V on this part.

The MJE15030/31 should be fine as drivers, above 67V use the MJE15032/33

Because of counterfeit MJ15003/04 transistors, consider using MJ21193/94 purchased only from an authorized ON Semiconductor distributor.

If you must use the MJ15003/04, buy an extra and take it apart to verify that it is real.

Look at the pictures carefully:

http://sound.westhost.com/counterfeit.htm
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