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Old Yesterday, 03:18 PM   #1
diyAudio Member
Join Date: Jul 2015
Default SABA MI212 problem : transistor heat


I have a SABA MI212 amplifier, it works, but there is a transistor and a resistor that become pretty hot (about 100-120C) at moderate volume. The heat is dependent of the volume.

Here is the schematic :

It's about R672 and T672 (bottom right of the schematic).
In my opinion, regarding the schematic, T672 is the cause of the problem, R672 has already been replaced.

Am I right ? If so, the BD388 is obsolete, but can I use a transistor with similar specs, except with a bigger hfe ? I know hfe is important in some cases but in this case I don't know.

Thanks for your help !

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