Re: 1974 silver face Fender twin Reverb OMG
If it sounds good, it is good. I've mucked around with a whole mess of different stuff, but I've come to appreciate silverface Fenders more than just about anything else out there (but keep in mind I like jangle and I'm not much into gainy things anymore). Heck, I think I prefer the silverface stuff to some of the tweed-esque things I've played, so it really comes down to what you're looking for out of an amp.
I might be able to add another perspective to this. Down here in Australia there were various taxes/duties/regulations that made it almost impossibly expensive to import American guitars and amps until the end of the 1960s. By the early '70s, things had changed and Fender products became easily available here (I think something similar happened in the UK). In both countries, the gaps were filled with locally-manufactured versions of the gear that those crazy kids with their electromomatic guitars and noisy beat music were clamouring for.
By the early '70s of course the amps that could be purchased new were s/f models. So most people here started their personal experiences of the Fender sound via those models. It was rare to encounter any earlier models, and those that were here had probably been imported individually and often had to be run with a step-down transformer from our 240 Volt power. As teenagers, my friends and I didn't think the Fender amps were good rock amps, they couldn't compete with the big tube heads and 4 x 12 cabs that we all used. However, depsite our views that Telecasters and Fender amps were only for country music, and maybe some traditional-style blues, we did begrudgingly respect the Twin Reverb for it's power, and some rock players were using them.
As the years passed and volume levels became more constrained, the Fender amps became better contenders for rock and pop. I started to become more familiar with the s/f amps and it was obvious they had some great qualities, and were quite happy to do rock with a pedal in front. Eventually i ended up owning a couple of s/f Super Reverbs and was impressed with their gorgeous clean tones and the fact that I could play virtually anything and get great sounds. Years later I was working on amps and performed repairs and services to many many old s/f models, and always enjoyed playing through them after i'd got them back to proper working condition.
During that time, i did encounter the occasional pre-s/f model, and most times i was unimpressed .... however, most of those amps were not prime examples and probably hadn't been serviced for many years. To my ear, they kinda had one good sound, whereas the s/f's had a beautiful clean shimmer that was also a welcoming canvas for shaping many sounds via pedals, which they seemed to enjoy.
I simply take the s/f amps at face value, i don't compare them to previous models or anything else. In good working condition, they are great amps ... simple, reliable and easily serviced or repaired (and perhaps a little too easy to mod judging by some of the weird and wonderful 'alterations' i've encountered, and usually removed with the blessing of the owner). Having seen the newer reissues and modern generations of (cheaper) tube amp construction, I have always maintained that with a little occasional love, the original s/f amps should outlive their owners, whilst the reissues and contemporary builds probably won't (although being cheaper, they probably still represent good value for money).
So my view is that if you really must have a tweed or blackface, search one out and buy it. If you want a good amp, the s/f models are great value, and even the worst-sounding ones are usually only a set of valves and filter caps away from being at their best, and from being able to give up great tones for many styles. I'd go as far as saying i don't hear any new amps today that can do the Fender sound as well as the old s/f amps, and even Fender's own reissues don't have the rugedness or ease of serviceability of the originals. As most people know, some of the CBS 'improvements' are easily removed or changed.
I've had several instances of players suddenly needing a new amp and having limited funds, and hence limited options. I would almost always recommend they seek out an old s/f at a good price and factor in some extra money for new valves and caps. That way they could get a great-sounding affordable amp, fully serviced and ready for years of tough gigging, AND with the Fender brand-name that will ensure decent resale value. One guy who did this emailed me after i'd serviced that amp to tell me that he was getting into trouble with his bandmates because while they were rehearsing songs, he would often find himself just holding a chord and listening to how good his amp sounded, completely forgetting that he was supposed to be playing his part in the song, hehe.
I suppose that Fender sold A LOT of s/f amps around the world, and because of that, many people encounter them when they (the amps) are old and in desperate need of some tubes and general service, leading to a poor reputation, leading to more abuse and neglect, etc. But now people are able to get parts and servicing more easily they are regaining respect, and rightly so.
So for my money, a good s/f can be a thing of beauty, and at some point the player has to take some responsibility by putting something toneful into the front of the amp in the first place. If most players can't at least make some kind of listenable music through a s/f, they may need to go back to the woodshed.