These are a bit more interesting than your standard hybrid, because they have an EL34 power valve as part of the valve preamp, so you get the full power valve goodness, and that does work pretty well, until the being made like a modern SS amp part kicks in and it starts cutting out and losing volume. I just noticed the EL34 is missing from the pic as it is in my valve tester and I took the picture waiting for it to warm up.
I’m not suddenly keen on Warwicks, just coincidence that these have come in. Actually, once I established the issue wasn’t just bad valves, and how much of a nutpain extracting the preamp board to sort it would be, I advised the owner to go to a mural friend and tech who is bit more keen on SS stuff and has contact with Warwick (who have ignored my email asking if they can sort parts for these).
Edit: I followed up with Warwick, they told me they already sent me a link. Didn’t put the link in that email though, apparently not guessing that I was asking why they hadn’t replied because I hadn’t got a reply.