Thanks duke, yea I tried to remove the back panel yesterday but it was very reluctant to come off....it does seem quite flimsy, so didn't want to force it too much. Decided the safest route was to just put the screws back in and check in here and ask. Interestingly my Head is one of the final batch ...

Hi Guys, first post here so if anybody would like a beer I'm at the bar! :Cheers ....picked up a Class 5 Head yesterday and the little amp has completely floored me. I plugged it into my Vox Heritage open back cab which has a Celestion blue in it....the results were fabulous! Gorgeous THICK singing...