This amp is mighty clean. Unmessed with. Only non original items are the 3 prong AC cable, the speaker (later Fender), and footswitch. Sounds great, looks great. Heavenly tremolo. Plenty of power for nearly any occasion. 

This was my go-to amp for many years. It's never needed much and I have a good tech who did minimal work a while ago. His/my philosophy is to do the minimal things that any vintage amp needs and not to replace original components "just because they're old." 

He said, at the last time of service: 
Tube Chart Stamp – ‘LC’ - indicates March of 1962
 Chassis Number – P01712
 Output Transformer Code – 606-213 – original Schumacher transformer assembled April 1962
 Power Transformer Code – 606213 – same as output transformer code; April 1962
 Tone Potentiometer Code – 304-6202 – original Stackpole from February 1962
 Remaining potentiometers appear to be original as well; not able to confirm without removal

 Speaker Code – 465-534 – Fender ‘Special Design’ 10” produced by Oxford, from 1975. 
The speaker cone is original and undamaged. 

 Filter caps and all resistors appear original to amp
 Cathode bypass caps were replaced fairly recently (within 15 years)
 Adjustable bias added and indicator lamp replaced June 2014

The amp has typical hum at idle, not distracting or more than most other tube amps. The power in my office is about as crummy/noisy as it gets so the amp may run more silent when powered elsewhere. It hasn't been out of the office in about 5 years.
I believe the filter caps are original. They'll probably go bad eventually, but I don't change them until they do. And it is not a big problem to change them if they go bad. Filter caps do not affect the tone/sound of the amp in any way.

Please consider that a new REISSUE of these amps is $2400 and is NOT vintage in any way nor will it gain value over time as a real original will. The new ones look the same and are fine amps, but nothing is actually the same as one built 60 years ago.