So the MPQ6001 IC is 15 dollars on ebay with 10 bucks shipping and i need 2 of them. So needless to say i would be much happier just replacing this part with 4 independent transistors. If anyone had a few hints as to what transistors would do i would be grateful. I was thinking MJE15029G and MJE15028G. Here's the datasheet for the IC MPQ6001 datasheet and Application Note, Data Sheet, Circuit, PDF, Pinout | Datasheet Archive. Thanks everyone! BTW- This is the Bias IC for a Son of Ampzilla.
Using the data sheet you can check each of the 4 transistors inside, they are either good or bad. There 2 NPNs and 2 PNPs. Search this forum for the discrete transistors, I think Mike Bettinger from Gas Audio had the answer. 2N5551s and 2N5401s is what he suggested.
Craig
Craig
If you bothered to look at the data sheet, you would see that the transistors are equivalent to the 2N2218 and 2N3904.
Unfortunately, companies cannot be expected to keep
> > manufacturing parts
> > forever, especially when the demand dwindles.
> > Regarding the GAS100A, it is
> > identically the same circuit that I also used in the
> > Sumo Amps and am still
> > currently using in my SST amps. Right now I'm using
> > a complementary pair of
> > TO-92 Darlingtons that are still available from ON
> > Semi. The circuit was
> > long ago made public. It is still the absolute
> > positive best thermal
> > tracking circuit ever created. If it ain't broke,
> > don't fix it.
> > James
> > manufacturing parts
> > forever, especially when the demand dwindles.
> > Regarding the GAS100A, it is
> > identically the same circuit that I also used in the
> > Sumo Amps and am still
> > currently using in my SST amps. Right now I'm using
> > a complementary pair of
> > TO-92 Darlingtons that are still available from ON
> > Semi. The circuit was
> > long ago made public. It is still the absolute
> > positive best thermal
> > tracking circuit ever created. If it ain't broke,
> > don't fix it.
> > James
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