Opinions on vintage cj amps and Teflon cap mods

Thank you, every post makes excellent points. I wouldn't be considering a modification of this expense if I wasn't considering these amps as long term keepers; long...long term. This modification is very expensive ($1800+ per chassis) and would be lunacy as an investment. However, and to my musical soul, there is an ineffable quality to these amplifiers that enables me to look past their audiophile shortcomings and enjoy music as I rarely do outside of a live event. I know that there are modifiers with excellent reputations, that would not restrict me to Teflon caps - Bill Thallman is certainly one; but the folks at cj believe that Teflon caps are the only worthwhile upgrade. It's a difficult decision to make without knowing the results. I don't want to lose the magic.

Pardon my naivete, but what kind of problems are endemic of older amplifiers. I know that caps eventually leak, but shouldn't a well maintained amplifier last indefinitely.

Thanks again everyone,
With your help, I've decided that the least I should do is try to hear some components that use teflon caps to try and identify their sonic signature in comparison with other capacitors and proceed from there.

Paul, I know that your right about taking baby steps and updating the power supply first, but if I'm going to go through the hassle, expense and risk of shipping these 90 lb. mono-blocks across country, I want to maximize my return.

Mrtennis, I enjoy much of what this amp has to offer. I'm hoping I can improve it without altering its virtues. Think of it like buying a vintage house that you love for its woodwork and craftsmanship of a bygone era. Would it be inconsistent to tear out the coal burning furnace and replace it with a modern heating plant?

Hi Casouza, Your post helps tremendously. You addressed all of the issues in question. Ultimately, I have to make a decision and it would seem to come down to this: 1) Would I be better off trying to restore these amps to as close to original spec as possible, 2)sell them, combining the revenue with the cost of the upgrade and buy a different amp or 3)taking a chance on the upgrade and hope that lightening strikes. Regardless of which I choose, your post is most appreciated. They all are.