You honestly did not think I was NOT going to add lights, did you?
So that’s what’s happened. The vintage radio valves now house coloured LED lights. I’ve also raised them so that they graduate in height up and back down a gentle horseshoe shaped curve. Apologies for my very ordinary photography but I’ve taken a photograph of the vintage valves lit up in the dark as I know this device will be used by my friends in a pitch black room where the device is the only ambient light source. 
I’ve set off the 5 vintage valve installation with a single red LED light beside the On/Off lever at the front of the device to signal whether the unit is live.