Iirc, the 6AQ5 is the small bottle equivalent of a 6V6….7 pin socket. That would have made more sense in a car radio, wouldn’t it? I have a Gibson GA17RVT Scout here that runs 2 x 6AQ5s. Nice amp. 6005 is the same tube. Surprisingly, I have gathered a fair number of these as they were used in TVs and radios. I got a bag full of them in a small military stash.
The problem with many modern 6V6s is not the limit on plate voltage but the screen grid. That EH6V6 with a Pv limit of 450vdc, which is 100vdc beyond a vintage true 6V6 fwiw, has a screen grid limit of 350vdc. The JJ6V6, which many consider to be a 6L6???, has a Pv limit of 450vdc and a screen grid limit that is also 450vdc.
As for differences, it would seem that @Jakedog has found the true difference…..circuitry. Fwiw, Jake, that 68CDR or any vintage BF/SF Reverb Fender amp, can be further modded to lean farther into what you like to hear. fender did not go very far in that direction. Techs have been modifying these two channel Fenders for decades to have two VERY different channels…great versatility.
I would be curious, @Jakedog, if you have ever played an AB165 Basman or it’s descendants…through the Bassman 50. Hot guitar amps due to NOT having the signal killing effects but having the 1+2 preamp. Then….one can take the bass channel, pull that preamp out, and build true fire-breather of an amp. There is an unused triode in these amps. One can build a very hot amp if one wants.
Quidnam tu dicis in verbis laici?
The Orange Rockerverb MK I 50 watt amps used 6v6s (the 100 watters used EL34s, though).