MPSU07/57 replacements

[denny9167]

I am intrested in building a clone to the Audioinics CC-2 amp,I owned the amp a few years back,but it was stolen,and I still have the schematic,These driver transistors are hard to find,and the NTE replacements are a little on the pricey side!! any suggestions?

[djk]

MPSW06/56.

These are MPSU06/56 without the metal tab.

MPSA06/56 are the 600mW version, the 'W' are the 1W version.

The 'U' were able to handle 1.5W with a small heatsink.

You might also look at the MJE243/253.

[denny9167]

Originally Posted by djk

MPSW06/56.

These are MPSU06/56 without the metal tab.

MPSA06/56 are the 600mW version, the 'W' are the 1W version.

The 'U' were able to handle 1.5W with a small heatsink.

You might also look at the MJE243/253.

Thanks,

The schematic shows the drivers running in parallel,Three each, I believe w/o heatsinks,so I guess the 600mW versions would probably work?

I checked out the data sheet on the 243/253,virtually identical parameters,with the exception of higher wattage,but lower bandwidth.

[wahab]

the drivers were parralele because at the time, they didn t have
such transistors with a 5W rating and with a high ft, in the order of
60MHZ...with one driver, the amp used to blow up as soon as the
load was somewhat reactive....currently, you can use
recent drivers like the audio pair 2SA968/2SC2238 with a 25 wtt rating,
one is enough....
for the output power stage, you can also use more recent bjt, the like
of 2SC5200/2SA1943...surely, the compensation network must be
lightly tweaked, otherwise, this topology is a must and is still
up to date...in fact, i never heard something better, unless it was the
same but with mosfet in the power stage...