I have a 1973 100w PTP head. Have had it for about 8 years. Hated it from the moment it arrived at my door. Kinda stuck it in the corner and forgot about it, figured "it's"collectible" leave it as is. Took it out every now and then to see if I could develop a relationship with it, but nope. So, finally I decided it was time to go. Took it to Billy Penn @ 300 guitars to be checked out, cleaned bias check......etc. just to be sure it was A-OK for its future home. So after bringing it in to the shop, he suggested I try new caps,tubes,etc. Removed a .68uf cathode bypass resistor some one had bastardized it with. He was very confident I would reconsider selling it. So, OK, go for it! Returns home after a week or so and....... Holy shit, it's the voice of God! Point of all this being change those caps! If you intend to actually play your old amp Never had one all freshened up before. It really makes a huge difference!