Vox Cambridge Reverb Hum and other noises

Ok, I have a 1966 Vox Cambridge Reverb all tube amp and it hums
terribly after warming up and gets worse when i plug the guitar cable
in. It has the original 2 prong AC plug, in fact, everything is
original. With the volume low (10 oclock), the hum is annoying, but
tolerable. Any higher, and the hum is LOUD. Also, I noticed that a
lot of times I hear a "click" sound when simply touching the string on
the fretboard, not even fretting it.

Could the tubes be replaced and cure this? I found this site but have
no clue which of the EL84's listed would be the proper ones:
http://www.boiaudioworks.com/index.php?cPath=58&osCsid=cb3c425bf38bb8c34b5291a1020454ed

Or, I've read the the cap filters may need to be replaced. Is this a
solder job? Something I could do myself? I am not electronically
literate but handy at doing things myself with good instructions to
follow.

I called a local shop and they said anywhere from $45 to $100 for
this, not including putting a 3-prong grounded plug on it...I forgot
to mention that when I called. Since I don't know these people at all
(found their # in the phonebook), I'd like to try to do some or all of
these things myself if possible. My philosophy has always been "I can
screw it up just as well as anybody....for a lot less". Maybe there
are other causes for these noises???

If anyone has a link to a schematic, that would also be handy.
Any help is much appreciated. Marty

.

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