So curiosity got the better of me, I ended up buying the Retroglide 800 to see what it was like after virtually no detailed reviews anywhere on the internet. I mostly use a late 80s Trace Ellliot AH200 head paired with a Barefaced Big Twin II for all my gigs. Lovely sound that I can tailor to most venues with the 12 band eq and the MOSFET poweramp provides lovely not too harsh break up after 12 o'clock on the volume control where also the tone starts to get compressed, lack of headroom for the bass frequencies etc but still the perceived volume gets really really loud and still sounds kinda lovely to my ears.
Now I was hoping the Retroglide would provide me with more headroom and cleaner output. Well the amp is very clean, nice tone, flexible EQ, but even at max volume it is quieter than the Trace Elliot AH200 at 12 o'clock... Not much extra headroom can be acquired by dialling out the 30hz - 60hz sliders either. So off (back to the shop) with this head! Abit of a disappointment really. I really really want to get into Ashdown but they let me down at every opportunity. Im sure they do lovely valve heads that I will look into for recording needs one day. All this marketing ploy about 800w! is all toilet. I know in order to be twice as loud as 200w it would need to be 10 times the watts or so, but quieter?
Other things to note. Yes the fan on the Retroglide is really that annoying if you wanted to play at lower volumes.