I've been playing around quite a bit with the 67 pro reverb I picked up and just had some thoughts, comparisons to my Tone King Sky King and some questions. One thing I was afraid of before I picked up the Pro reverb was that it would be far too loud to get it to a good tone in my office and with no attenuator to tame it like on the sky king I feared I'd be subjected to thin bad sounds. The Pro reverb will be my only amp for a while till I find a vintage deluxe reverb as the Sky King is gone. Well I was relieved that I could actually get the pro reverb up to about 3-3 1/2 comfortably. My Sky King without the attenuators clicked, I could barely get it to 1 1/2 and it would be thin sounding. Although the Pro reverb seemed clean all the way up to 5 so definitely has more headroom. Not sure where it breaks up because up to 5 was far too loud to tolerate. I'd have the attenuators clicked about halfway before I could get a sound I was happy with. And the sky king always felt a little stiffer sounding which I was able to get sounding good with a Cali76 CD. The pro reverb in contrast has a lot more snap and natural compression which I'm able to accentuate a bit with the Kingsley Page set slightly driven. I'm currently running with out a compressor and I don't miss it. My first question, is how much might this have to do with the cabinet, Baltic birch ply on the sky king, solid pine on the pro reverb. Could this account for some of the volume differences. As well is the iron on the sky king a little bigger. I have heard that the output transformer on the pro reverb is smaller so I assume maybe thats why I'm able to turn it up more? Now whether its smaller than the sky king I don't know. The other thing that has me perplexed is the sky king is cathode bias and I assume the pro reverb is fixed bias (but not sure). So by definition the Pro reverb should be more efficient (louder) than the sky king? Whatever the case I'm pleased that I can get the volume up easily to 3-3 1/2 in my office. I imagine on stage I'll easily get 4 to 4 1/2. It seems the Pro reverb solved some issues I had with the sky king. The reasons I got rid of it, no matter how much I tried the lead channel was useless to me, Ultralinear mode was useless to me and the reverb on the pro reverb is far better. The one thing that always dissapointed me on the sky king was the reverb. As much as the Rhythm (blackface inspired) channel was sweet and lush what I'm hearing from the Pro reverb is far more sparkly\shimmery. Maybe I would have liked the version of sky king better when Mark owned the company as I know some changes were made.