maybe not. depends on what you pay I guess. It's not really a total renovation though. Its just electrolytic caps, and I could probably get away without changing all of them. My meter shows that 2 absolutely need changing, but in total there are only four multi-section caps.
It would be worse if it had fried resistors, a damaged OT, or if the valves were all toast but really its the kind of thing that just slowly happens over time, and if you own an amplifier for a long period of time like 20 or 30 years, as the caps go bad it probably happens so slowly that you adjust to the change in sound and in your mind it never sounds any different. On the positive side the 7027A output valves test ok, and those would be very expensive to replace. It has the original Magnavox branded ones from when magnavox bought Ampeg. The 6K11 is fine, so is the 6CG7. One 12AX7 is bad. so really its 4 big filter caps and 4 small caps in that sit in the bias supply and the preamp. If I recapped it with singles its probably less then 30 or 40 quid in nice capacitors and it would work fine... I just fancied splashing out. I have spare 12AX7's kicking about so thats no big deal. I knew it would have some issue when I got it. I'd say most amps from the 70's would probably benefit from a cap job these days if they are still running the originals. I'm making it sound worse than it is.
Resale value is a good point though. If an amp is "your baby" sometimes you might want to go all out on parts. If you're fixing something up just to sell it and you want to make the maximum amount of cash back, maybe that would be the wrong idea.
