When the US Army tested the reliability of their service pistols, they put thousands of rounds through them, they looked for numbers of jam, accuracy, part breakage, failure due to overheating, corrosion..... And the beratta won the contract.
When I test the hardware in audio equipment, I look for the possibility of failure from day to day useage.
As far as Franks equipment, I have not seen it all, but I notice a few things. The earlier Pas 4 preamp chassis had better bracing (from a picture), the later ones, once the top cover's taken off, the whole chassis becomes flimsy.
When you connect the cables (not oversized) to the RCA jacks with the cover off, the whole backplane would bend and get pushed in, that's when the RCA jacks are new and tight. After a few times of jacking in and out, the RCA jacks start lossing their grip, a hundred more times of cable swapping, (of course I stopped right there), the RCA jacks would definitely become loose and cause signal dropout.
As I stated before, I measured the diameter of the center conductor of two types of RCA cables, the radio shack brand, and the monster cable, actually the center conductors on both are about the same size, the shielding on the Monster cable are larger and has tighter grip, but that would only scrap and scratch the plating off the ground of the RCA jack, and has nothing to do with sretching the center contact.
If once you connect the cables to the AVA RCA jacks and leave them alone, it'll probably be OK.
The Fetvalve amp chassis are based on the similiar design as the preamp, but with heavier gauge steel, so it appears to be stronger.
If you do the hardware reliability test on a Krell and AVA, Krell would win.
Speaking as from a consumer's point of view, I would be more than happy to pay for the extra $ to get better RCA jacks, heavy duty switches, and better bracing on the chassis. Will these extra items make the equipment sound any better? Probably not, but the pride of ownership is what counts.
I don't want to hear anything like "why don't you spend thousands more and buy a Krell then?", My question to you is "why not spend a few more dollars and make AVA a better product?"