Another experience that I was deprived of whilst drinking the koolaid of modeling was being able to open up an old amp, look at all those cool components that are tangeble (meaning I can see and touch them) get out my soldering gun and swap a cap here, change a resistor there and listen to what the effect on the tone was. I've got a box of stuff on the way and I can't wait to dig in this weekend replacing old tube sockets , some ceramic caps to replace the SM's. Vary it by a few Pf here and there just to see the results. I've gotten so I can pull the chassis, discharge the caps, do some mods and be playing it again in 15 minutes. Its a very rewarding experience and I was unaware just how much I missed it.