Philips Fa 951 (2sd1895 and 2sb1255)
 

Hallo, I'm "burning out" half of the final transistors. Can someone
tell me what am I doing wrong? Should I verify something? I checked
already all the components on the board and everything looks OK, but
after 5-6 minutes the transistors show a B-E short, and nothing works
anymore.Thank's for your time. Best regards. Criss

Philips Fa 951 (2sd1895 and 2sb1255)
 

"crissmuty" bravely wrote to "All" (22 Nov 03 08:47:55)
--- on the heady topic of "Philips Fa 951 (2sd1895 and 2sb1255)"

cr From: (crissmuty)

cr Hallo, I'm "burning out" half of the final transistors. Can someone
cr tell me what am I doing wrong? Should I verify something? I checked
cr already all the components on the board and everything looks OK, but
cr after 5-6 minutes the transistors show a B-E short, and nothing works
cr anymore.Thank's for your time. Best regards. Criss

This is an audio amplifier right? Put 100 ohm power resistors (or a
lamp) in series with the collectors to limit the current until you can
determine which voltages are wrong. It may be an idle current or a DC
balance problem. Don't connect speakers until you are sure it is fixed.

.... Is reactance then illusory? No, it just appears that way...

Philips Fa 951 (2sd1895 and 2sb1255)
 

Thank you for your answer.
Yes it is a Amplifier. I think also there is a dc current balance
problem. The only problem is that the transistors are very expensive
and I don't want to try again without a good advice.