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NOS 6550a are 42W tubes. Modern 6550 are 35W. A 2204's power supply is designed for 50W clean output (cranked). Biasing 6550a at 70% is asking the amp to produce more than 50W at idle, before you've even turned the volume up past zero. So while the tube is happy enough to dissipate that kind of...

This is correct. And ultimately, it doesn't matter. As long as the tubes aren't red plating, you're fine. You want the bias hot enough to get rid of crossover distortion and cool enough not to damage anything. Anywhere in between in fine as long as it sounds good to you. And really, there isn't...

Man... if it had 6L6 I'd be all over it

Send him my way ;)

Yeah the layouts are all there

Yep, that's the one

I was never a fan of the V30. The Greenback, and all its variants, is my favorite. I even like the H mag more than the V30.

I think he's just too excited haha. I put some Heritage H30 55Hz in one of my Bogner cabs and he liked 'em so much he found this mint cab with the same.

You won't be able to go back to a stock 1959 circuit with this kind of mod unless you literally put everything on switches. It can be done, but it will be a ton of work. The difference between a stock 1959 and the most basic version of the amp in that last video is at least 20 components as...

Similar ball park as this.

You can also add extra tube stages, which IMO sound better than diodes.

I wouldn't immediately think of AIC when talking about the Lundgren M series because it was designed for Frederick Thorendal. When I think of AIC, I think of chewy '90s rock, not stop-on-a-dime down-tuned Swedish metal. But I suppose it depends on a lot of other things in the signal chain.

That should be pretty easy. The Meshuggah is just an 800 circuit with diode clipping. Typical Jose mod type of thing. Ceriatone has a layout you can use on their website.

What is that serial range?

Start by reading everything on Rob Robinette's website. https://robrobinette.com/Amp_Stuff.htm Then buy The Ultimate Tone series from London Power. https://londonpower.com/tut-selection/ There are a bunch of other resources as well. But the sky's the limit when it comes to modding a 1959.

It's a subtle difference, but in that clip the Tremoverb sounds best to me. Slightly thicker low mids, less highs. But could just be the normal variance in the components and pots due to tolerance. Certainly not different enough to warrant going out of the way to find one.

https://reverb.com/item/92459012-lundgren-m6-bridge-2024-black Standard spacing, but drilled out for direct mount.

Looking for a Lundgren Black Heaven 6 Bridge Ceramic Black on black F-spaced

Yeah the M6 sounded better to me too

whats it called?