Help solicited in completing my amp....

[anilva]

I made these very amps in my younger days. The amp is not a great one with capacitor coupling to the speaker. The preamp is supposed to be ultra low noise one and was quite famous in those days, but had too many discreet components and that too many precise gain BCxxx type transistors (-A, -B, -C etc).

I would not pursue the project either for fun or for quality. Way too much effort and if you put that on newer ones (Chip or discreet) you will get better bang for the buck.

Cheers.

 

[linuxguru]

I would not pursue the project either for fun or for quality. Way too much effort and if you put that on newer ones (Chip or discreet) you will get better bang for the buck.

I have to agree that newer topologies, especially in chipamps, offer more bang for the buck. However, the Philips power amp is a stable, classic topology that can be improved with a few changes (listed earlier), and has scope for further mods by experimentation to improve audible sonics - it can be made surprisingly competitive, given the age of the design as well as the active components used. The main weaknesses - single power rail and DC blocking capacitor on the output, are not as serious as it appears at first glance. Dual feedback paths and compensation tweaks take care of most of its weaknesses. It is even possible to consider using an SMPS for the power supply, similar to the Amp Camp Amp.

It's all a matter of how much time and effort you're willing to put into experimentation/auditioning.