I would like to know the precise placement and function of the valves in the JVM 1H 50th Anniversary Limited Edition. I know there are two ECC82 and three ECC83 valves. But I don't know what they do and where they are located in regards to the front or back of the amp (i.e. from left to right and from front of the amp to the back).
Hi Nuno,
We would recommend any valve replacements are done by an engineer.
Regards
Marshall Support