Another Irish Mystery

[standunmj]

addendum.....hi guys, line up for this set is ech35, ef39, ebl31, az31,first three are red mullard valves, and the rectifier is clear glass, had a scan done on the logo on top , its 'invicta'. and an old chap from the trade has given me a manual of sorts its called an invicta 30, have taken pics of the rear chasis , and will send them presently ,thanks for putting up with my rant, regards maitiu.