School me on the JVM410 and JVM205 heads

[jchrisf]

I got to spend a few minutes with it and to me it sounds like a DSL. I was not all that impressed. I'm wondering if I need to bias it? I did like the Crunch and OD1 channels the most.. the clean channel was awesome with an OD in front as was the Crunch. I did like the Plexi trick on OD2. The Reverb wasn't very good. It does sound great but nothing special so far.

I need to spend some more time with it and see what I can dial in but I think it is going back unless I can bias it and it comes alive.. the journey continues and I'll see what else I can dial in with it.

 

[BABMusic]

I got to spend a few minutes with it and to me it sounds like a DSL. I was not all that impressed. I'm wondering if I need to bias it? I did like the Crunch and OD1 channels the most.. the clean channel was awesome with an OD in front as was the Crunch. I did like the Plexi trick on OD2. The Reverb wasn't very good. It does sound great but nothing special so far.

I need to spend some more time with it and see what I can dial in but I think it is going back unless I can bias it and it comes alive.. the journey continues and I'll see what else I can dial in with it.

I also felt like it sounded very close to my old DSL100. I checked the bias on mine with a Eurotubes probe, and it was ast 26 mA for both sets of EL34s. I left it alone because Marshall used to set the bias way too high and 26 is much safer. It's a little low, yes, but it's a safe bias. Anyway, maybe give it some more time? If it's not for you, at least you now know.

 

[jchrisf]

I also felt like it sounded very close to my old DSL100. I checked the bias on mine with a Eurotubes probe, and it was ast 26 mA for both sets of EL34s. I left it alone because Marshall used to set the bias way too high and 26 is much safer. It's a little low, yes, but it's a safe bias. Anyway, maybe give it some more time? If it's not for you, at least you now know.

What's the bias supposed to be?

 

[BABMusic]

What's the bias supposed to be?

You know, Google AI says 30-35 mA. I wouldn't put up higher than 32 because Marshall PCB has shown to have problems with hotter bias. Definitely do not want 38 with this amp.