I must admit, I skipped large portions of this thread — there was a lot of stuff about PhDs, if my skipping eyes skipped correctly.
The thread began with someone removing the little U-thingies that connected pre-to-power in an integrated amp, and replacing them with a short length of good interconnect, and hearing a dramatic improvement.
I bought a Denon 2-channel receiver recently at Goodwill for $40. It looked like BPC, but was very heavy, with a potted toroid, and it had a MM+MC phono stage, a cut above most receivers. I expected it to be decent. Turned out to be good. After a little google, I learned it put out 125 WRMS, and I think that's a conservative rating; it retailed for $1000 over 25 years ago (about $2300 today), and even got a rave review in the New York Times, of all places.
It had those U-thingies in back. I didn't replace them with cable — I opened up the unit and soldered the pre and power directly together. This improved on the short interconnect link used by the OP by eliminating 4 lossy RCA-to-RCA connections and 4 unnecessary solder joints.
Damn! It wasn't just a dramatic improvement, it was Shaespeare. "Good" went to High End! And I don't say High End lightly, my system used to be the high priced stuff that graced the covers of the magazines. I still use van den Hul and Ikeda MCs and they're sensational through the Denon, no downgrade there — the Tuner is damn good (my Tandberg 3001 and Accuphase are better but it's close) — the power amp is a quasi Class A allegedly designed by Nelson Pass — so it had some promising ingredients.
And hard-wiring that pre-power link brought it all together. A truly High End receiver has long been a goal; Magnum Dynalab launched one but its reviews were luke-warm and price too high — a lot of $ went into external cosmetics. Now
I now have a high end receiver, with all the convenience of three components in one, and no jungle of cables. For 40 bucks and 20 minutes work.