This is a very rare combo and there is very little information available about it. It doesn’t appear in any of the WEM related documentation I have so all I can do is to show a few pictures here. These pictures were taken from different websites that were available for the public to view so I hope the originators of the pictures don’t object to my showing them here. If anyone does object, please let me know and I will remove them.
I believe the Deep Blue combo amplifier section was basically an ER30 using a set of 4 x EL84 valves to provide around 30 watts of power. In addition to the amplifier, the Deep Blue also came fitted with a WEM Custom Copicat fitted at the rear.