I know "cork sniffing" has already been well covered in this thread, but I wanted to chime in with an observation from my recent servicing of a Matchless HC-30. I opened the chassis expecting to find only the best named components...and I found plenty of good quality hardware. Carling switches, Swithcraft jacks, Belton sockets, CTS pots and HUGE transformers. What I didn't find was a collection of super premium capacitors...coupling caps were Mallory 150s, e-caps were a mostly Samwah (had never heard of them, but later found they are just ordinary consumer grade caps used in a bunch of Samsung products) The only thing that I would consider "mojo" components were the 1-3 watt carbon comp resistors throughout (that were all well within spec where I could test them) with a few carbon films here and there. They also use polystyrene caps vs. silver mica or ceramic in for smaller values. I know polystyrene is said to have very nice audio qualities, but my understanding is that their capacitance drifts rather easily with temperature variation. That amp runs very hot, and It didn't seem to have any noticeable change in tone so I guess it's not that big of a deal as far as this amp was concerned anyway. Anyway the bottom line is that the Matchless was very impressive from a build quality standpoint. And the lack of super premium capacitors didn't hurt the tone one bit. I would expect to see more and more carbon or metal film resistors in even "boutique" builds as existing supplies of CC resistors are depleted. I know from trying to source components for my own upcoming build, finding tightly spec'ed carbon comp resistors in 1+ watt values is becoming very expensive. If you want to put a little extra into the hardware side, good switches, jacks, etc. that's not a bad place to spend a few extra dollars since they have some physical wear and tear.