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A member at another forum who may or may not frequent this one was telling me of the changes in the marshall JCM800 channel switchers which i'm looking at right now. I have had 3 of them in the past and one was a far better sounding amp than the other 2. It was the earlier one with 6550's. However, it wasn't the tubes that made it better because i modded it for EL34's and it still killed the later ones i had. This person, John Phillips told me there were 3 circuit designs. the first being FAR better and far different than the later ones. I think this one was the first year they made the switchers or maybe the second too. Then he said they changed them drastically for the next year or 2. Finally in i believe '85 they changed to EL34's and a slight circuit change somewhere else too.
problem is, he's in england and didn't even know they made the early ones with 6550's because the non USA export models according to him were EL34 from day one. This is why i posted here.........because while he seemed to know a lot about them in great detail, the one thing he doesn't know is what differences the export models saw. And therein lies my question. I want to buy another 800, the 4210 1-12" combo to be exact. But knowing how much better my early one i had sounded i want to make sure i get that same circuit. problem is, it's been a long time and i cannot recall what year it was. It was one of the pre-EL34 models but i cannot recall what year. So i need to know what changes took place in these amps in the years preceeding the change to EL34's which should be 82-84 if i'm correct. I think 82 was the first 800 channel switcher and 84 was the last one with 6550's. In any case, does anyone know which year between 82 or whenever they came our and 84 there were significan't circuit changes? john mentioned the change can be determined by looking for transistors used in place of the later IC's. Anyways, i need to know which years had the earliest circuit. Thanks.
problem is, he's in england and didn't even know they made the early ones with 6550's because the non USA export models according to him were EL34 from day one. This is why i posted here.........because while he seemed to know a lot about them in great detail, the one thing he doesn't know is what differences the export models saw. And therein lies my question. I want to buy another 800, the 4210 1-12" combo to be exact. But knowing how much better my early one i had sounded i want to make sure i get that same circuit. problem is, it's been a long time and i cannot recall what year it was. It was one of the pre-EL34 models but i cannot recall what year. So i need to know what changes took place in these amps in the years preceeding the change to EL34's which should be 82-84 if i'm correct. I think 82 was the first 800 channel switcher and 84 was the last one with 6550's. In any case, does anyone know which year between 82 or whenever they came our and 84 there were significan't circuit changes? john mentioned the change can be determined by looking for transistors used in place of the later IC's. Anyways, i need to know which years had the earliest circuit. Thanks.
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