Re: Twin Reverb Watts question
worth noting that amps wattage ratings are for max wattage before clipping (distortion). As a result with a twin (depending on the model) you can have 85, 100 or even 135 clean watts. If you are winding the volume up on your amp past the point where the amp is distorting in the power section, then you can have considerably more wattage being pushed into the speakers. My 60s twin starts to break up over five on the master and it is really roaring on seven or 8. Yours may be different due to the ultralinear transformer which is probably how it gets 135 watts out of the same amount of tubes. Fender may have simply increased the clean headroom to 135 watts but no necessarily the maximum output.
Still, I cant see too much of a problem running a pair of 65 watters in parallel even though they are rated to 5 watts less than your amp. Most speaker manufacturers tend to understate the wattage rating of their speakers somewhat. Just be aware that you are right on (or slightly outside) of what the manufacturer's specs are on paper.
fwiw, if you have not alreasy bought the celestions, have a look at eminence texas heats. Just spectacular speakers for big twin reverbs and much more suited to oped backed cabs and big open classic fender amp tones than greenback styled speakers, also one speaker alone is rated for 150 watts. A pair of them at 300 watts wont even break a sweat with a twin.