Preamps w/ polypropylene caps in power supply?

I am just curious. Do you think think avoiding electrolytics with their usualy high capacitance is a good way to go. To be clear are you advocating the CJ method? I really don't know enough to think one way is better than another but am anxious to learn.

The Coincident Statement Linestage and the Purity Audio Design linestages have exclusively all poly propylene capacitor power supplies.I`m sure there`re others also.
Regards,

There's a whole subculture around caps. Poly caps in the power supply are theoretically "faster" and definitely longer-lived than fluid-filled electrostatic caps. The biggest advantages of electrostats is that they are quite cheap and compact for the value of capacitance that they offer. To achieve the same capacitance in a poly cap requires physically large poly caps or a bunch of smaller poly caps wired in parallel. Practically, there's usually not enough room under the chassis to do this easily.

Many people believe that the advantages of poly caps in the power supply can be achieved by bypassing the electrostats with supplemental poly caps. John Curl has written some interesting papers on this practice.

I have no specific experience in replacing electrostats with polys, although I've routinely bypassed them in some applications. The biggest wins have been in other areas. I have had sonic successes with tube amps where I've replaced or supplemented power supply filter caps with oil-filled motor run capacitors.

Frankly, for me the biggest buzz and sonic payoffs are usually found for coupling capacitors rather than in the power supply. Modern electrostats have much lower ESR than was true a couple of decades ago, so the poly caps are not such a big improvement any more.

Just my $.02