Summed up opinion: the tone is fantastic if you're going for that classic rock 60's -70's style tone.
More detailed: That being said, it isn't a one trick pony, that's just what it does really well in my opinion. As I mentioned before it takes pedals really well - so you can really get some heavy and shapable gains on it...I just love the sound of the preamp on it that I don't care much for the pedals. The EQ knobs (as typical with most Marshalls) don't do a whole lot. I really just keep those all at the 12 O'clock for now. The tilt and presence knob sort of take over on that job. If you back the tilt control off to more of the "channel 1" style marshall you can get some really warm cleans out of it. It's never going to be 100% clean but its close....(this may be different as you get to the high power setting, I haven't had much of a chance to mess around with that yet, just the low and medium since this puppy is LOUD).
I don't have much experience with vintage marshalls, and I'm certainly no expert, just what I have heard via videos or my favorite records, but I think it sounds great. I'll see if I can't get some sound clips up at some point.
more wattage going through the same amount of tubes
So in the 20w i believe it's a different biasing circuit for the power tubes (cathode biased power tubes, normally "fixed-bias" in 2xEL34), combined with much lower plate voltage and smaller transformers, someone on the internet having stated on the origin 20 the output transformer is mismatched also dropping power. But each of these things would have the effect of killing the upper harmonic distortion that makes tube amps sound bright, alive, and juicy, and when the tube is run at low voltages the first thing to go is treble response and headroom starts to go down.
So what you're hearing is yes, in the 50 the proper wattage going through the tubes. In the 20 it's a bunch of fancy tricks to "brown out" a marshall power section down to 20W levels. They did OK by most accounts but they don't sound light years better than say just making a 50W amp and having a pentode/triode mode (more traditional "half power switch").
The "by most accounts phrase" was referring to the first part of the sentence where I said "they did ok".I've never played an Origin 20, but I have a Mini Jubilee head which is a pair of EL-34s cathode biased to 20W. The things you mentioned may be true in general, but they're absolutely not the case with the 2525H. It sounds plenty bright, alive, and juicy and the power amp compression and clip sound and feel like you'd expect. It doesn't have the bass response of a bigger amp, but that's just not going to happen at lower wattage.
In addition to the 2525H, I also have a 2555 which has a pentode/triode switch. Having compared both amps extensively, I have to strongly disagree with your "by most accounts" statement. Triode mode on the 2555 sounds AWFUL and I never use it. It's spongy, muddy, and harmonically dead. Even the 5W mode on the Mini Jube sounds better.
If volume weren't an issue, I'd take the 2555 over the 2525H any day. The Mini Jubilee sounds great, and it really does get 80-90% of the tone of its bigger brother. In fact it's so good that I don't really notice the difference unless I immediately switch from one to the other. Meanwhile in the real world, the 2555 is so loud it's almost hard to contemplate while it weighs as much (or slightly more) than the 2525H and my ported 1x12.
The "by most accounts phrase" was referring to the first part of the sentence where I said "they did ok".
Not saying most people consider triode better.
The 2525 seems like it was designed thoughtfully.
I honestly don't know if they implemented it as well in the origin 20 or what. I hope to try one soon.
Triode mode is kinda dead in comparison to pentode but I've tried it on a few amps and it's better for me than some of the cathode biased amps I've tried but none of those were new Marshall 2xel34 cathode biased, more like egnater or Peavey. So yes I'm not saying that cathode bias sucks or triode mode works for all, and it's totally not the same as when you design from the ground up around a low power el34 setup.
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I feel like the DSL50 head I had was very sensitive to power tube changes as well.
JJs have deeper bass
I find the Chinese to be the most balanced, almost too much. I think they got used sometimes on the DSL40c. They sound modern but not as thick as JJ.
Those old marshal svetlana tubes had the midrange that I thought made the DSL sound "80s rock" and more JCM800. I wonder how they would do in the origin?