The JoLida amps (102,302,502) are all well built and very reliable. They use quality iron which is more than half the battle. The circuit is simple, straight forward and time tested. With a couple of very easy and reasonably inexpensive mods (better coupling caps, B+ and grid stop resistors and maybe diodes if you want to go that far), you can have yourself one heck of a nice sounding amp for not much money at all. If you are buying new, when you call to place your order, the factory can install all of the upgrades I mentioned for a minimal charge. If not, any decent technician can do the mods if you aren't handy with a soldering iron.