. Feeling some good audiokarma 
I replaced all the caps except the canncapacitors, which i reformed by slow powering up with a variac over about 12 hours. How long before the can caps need replacing?
Those old can caps are well made but they are close to 60 years old so who knows when they will call it quits. One way to tell is if they are getting warm quickly when first powered up. But for peace of mind it is just better to change them out with new caps. I also wanted to say that the old carbon comp resistors will develop more resistance as they age this will also affect the voltages. The CC resistors are also more noisy than modern metal oxide or metal film and carbon film. About the only spot to keep a carbon comp is in grid stopper position. There is much debate on resistors so, you can read up and decide for yourself.
Some people or collectors think that the way it is after all these years is the most authentic that it can be. Unfortunately for electronics, and not like fine furniture, that can be a very unsafe even dangerous thing. If my unit was in really 'mint' condition i usually keep it that way but i don't really use it. I tend to keep it more as a museum piece and get another for playing and rebuilding.
Im guessing its more like a vintage car, it can be all original but youd want new tires, breaks etc.
A friend of mine has a pair. Enjoy.
