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I'll find the thread/comments I've read about how to bias 6550s in Marshalls, and why. At the same time, I don't think I've read about OTs frying because of running 6550s at their normal bias points which are higher than 34s, so maybe it's not a big deal. I guess I'm just a little on the...

The earliest 800s from 81 had basically the same exact circuit as the 1980 JMPs. But, the 800s would get brighter and more aggressive as the years passed. Different caps, red legos, for example vs the JMP caps; the PT in the earlier 800s were a much higher voltage than the late 70s JMPs.

I guess you haven't played any vintage Marshalls then. This is probably the dumbest 'read it on the internet and re post' statement I've seen on any forum. I've had 60+ pre 1990 Marshalls, and the only one that didn't sound very good had leaky can caps, and the tubes were biased at 15ma. 60$...

The way I've read it, because the 6550 is a 40 watt tube, when it's in an El34 amp, that is designed for 25w per tube, when the 6550 is biased up to say 50-60ma it wants to pull that 40w from the OT but can't do that comfortably since the OT is designed around 34s that are 25w per tube. So the...

I like them both; but if pressed I'd choose 34s. But, if I get a Marshall that has 6550s it gives me a chance to use my small GE stash lol.

Also, when biasing 6550s in a Marshall you need to treat them like EL34s since the transformers are designed for them. So, between 30-40ma should be a sweet spot. That way the OT isn't stressed by 6550s biased up in the 50-60 range...not worth risking imo.

With newer production/high gain amps I agree, tube rolling doesn't make much difference. But, in my exp with vintage Marshalls pre 1990 they are a noticeable change up when pre tube rolling. And, in the OPs case, I'd HIGHLY recommend grabbing a pair of GE 6550s, bias them up and turn up...BIG...

Congrats!! Long ago, my backup was an 87 RG 550, I bought for 150$ from a guy who said he won it in a Guitar Player magazine giveaway. Great guitars.

This is what I wrote back in 16....both are Sylvania 6L6 GC..... "I've actually read the opposite, the 387 has a bit more headroom. But essentially both are the same tube made by Sylvania. The 387 can come with 1 or 2 getters, while the 415 is always 2. According to the Boogie Board. I have a...

The only amp IMO that is REALLY good at low vol is a Naylor. Which has a rep for the best master vol in the business. I've never noticed a difference though, in ANY amp other than the 2 Naylors I owned, in low vol playing. They all respond the same whether it's a Marshall or a Mesa or anything...

Man, I've had SOOO many Marshalls at this point that I'd like to think I've got a good take on them. This 'thin' tone thing is stupid at best. Why? EVERY FRIGGIN AMP SOUNDS THIN at lower volumes. Or, not at their best UNTIL you turn up to say, 1-2. Mesas/Diezel/Bogner/SLO/Wizards it doesn't...

Chubtone gets my first vote. Luxxtone is also great; but they are quite a bit more $$.

Yep, I have a stash like some of you have. Mostly Siemens/Winged C EL34, some 6L6/5881s and a few GE 6550s. Pre tubes are Tungsram, Ei, Mullard(vintage), Chinese square getters from 89-today, Amperex, GE, RCA, Fivre and others I forget. Plenty to last me till the end of my days.

Yep, I agree...in fact, almost any pre will also be brighter as the JJs IMO are typically a good bit darker.

I was super surprised at the 3D tone I get out of that Peavey...I knew about the VHT stuff, though I haven't owned one, but did have a Mesa S400 for a year or so...this 60 has almost the same amount of 3D awesome as the S400 did...although, at a much lower wattage lol. But still plenty of power...

I picked up an older 60/60 power amp, it was 'non functioning' and 150 shipped. Well, I opened it up and it was SOO dusty I took a vacuum to it, after that I pulled the tubes and gave it a DeOxit bath. After cleaning the tubes (Peavey Super Six labelled Sylvania STR 387s/6L6 GCs, Chinese 9th gen...

I like and understand the Schaller thing...I have some...but...I can't use them because they CANNOT not feedback. Classic rock only pickup. For me anyway.

He really means 377.60 $$ which is more realistic.

The vintage DFs that I have remind me somewhat of an MCP Afwayu, but MUCH better. Mids are great but not prominent, BIG lows and the clarity/feel is the best of any pickup I've played. Not played a 498T though. Scotts Psykes is also very very good...not as good as the original but it also...

Yes, to my ears it does....take a 16 ohm cab and switch the amp down from 16, then 8....then 4 and hear for yourself. Going lower gives a perceived darker, thicker tonal response from the same cab.