To Chadnliz: I haven't been inside an HCA 800II, but I'm sure that there is plenty that can be done with it. One look at a schematic and I would have a pretty good idea as to what you could do.
To Rcziech: The modifications involve disassembling the entire amplifier and replacing stock components. I'm not getting into altering the actual circuit or replacing sections of the circuit board, necessarily. These mods could be done by anyone with a RadioShack soldering iron and desoldering tool. The only other tweek involves rebiasing the output devices (which is much less difficult than it sounds), which does require a voltmeter; but this tweek isn't absolutely necessary. I'm not sure what I would charge, though it wouldn't be exorbitant by any means. It would take a bit of work--I'd have to take high-quality color digital photos, create my own schematic diagrams, and make sure it was written well so that it was easily understood and followed. I was thinking that it would include a short primer on soldering and desoldering technique, a step-by-step guide to disassembling and reassembling the amplifier, as well as instructions on modifications, parts list, and a list of sources (with approximate prices, as they change with time) to find the parts at. All of these sections would have color photos to guide the reader along the way. What do you think a reasonable "fee" would be? Notice that I am NOT asking what you think it "should" be worth, but how much do you think people would pay?
By the way, the reason for my considering a "kit" is because I have been able to get the parts I use at very low prices compared to what you would normally find. This saves the "tweeker" money (in both price of parts and separate shipping fees), as well as the hassle of tracking down all the parts. There might be some things I could do with supplying very nice wire as part of the kits also, but that remains to be determined yet. Of course, high-cost items (like WBT binding posts & RCA connectors, etc.) would be optional.
To Myraj: I replaced a good number of stock components (capacitors, resistors, bridges, output devices, wire, connectors, etc.) with much higher quality parts. The result is greatly improved sound. The catch is that you have to know what parts to replace, what parts to use instead, and where to find them at a good price. I don't remember exactly what I spent on my parts--I'd have to add up the receipts to be exact--but I think as a ballpark I spent about $100 including shipping fees from several different shippers, and I replaced a bunch of parts.
