4 x EL34 (6CA7) Valves (Tubes) JJ Matched Quad NEW TESTED

Not that much choice out there for tubes these days but JJ got good reviews so I tried a set in my Marshall bass head. These were well packed and arrived quickly. I bought a matched set since the amp is 100w with 4 x EL34 outputs. Being a tech I measured the anode current for each valve to check the matching whilst I set the negative bias to around 33mA and the matching was pretty good - 31 to 35. The result sounded as good as ever. I also change the 3 pre-amp valves for JJ ones. Overall happy with the make of valves and the supplier.

They were easy to fit and worked as expected. I am unable to comment on the finer points of operation of these tubes as I don't have the necessary experience.

I installed these in my Marshall JVM 410h the other day after my previous set of EL34's fitted by Marshall gave up the ghost. So far they're working fine and sound just as good as my previous set of EL34's. No complaints here.