Marshall 2203 REEEEEEEEEEE-work

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PLX
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Re: Marshall 2203 REEEEEEEEEEE-work

Post by PLX »

harddriver wrote: Sun Jul 03, 2022 4:11 am If you are going for EVH stuff the EH6CA7 are the closest to actual Sylvanias they just need to be burned in good to weed out the initial mortality tubes.

The EH's are beam forming element tubes just like a 6L6 and NOS 6ca7 tubes under a heavy vaccum as well. I ran a quad in my 69 and they sound just as good as my Sylvania's to be honest.

If you are a EL34 fan then the EHEL34's are super reliable these days and pretty much a clone of XF1 Mullards, Dave F uses them in his new production amps for a while now.

I find KT88's sound more like a big EL34 versus a 6550 which are like a big 6L6.

For 12ax7's I would go Tung SOL reissue on V1, Ruby HGAC5 Chinese 8th Gen for V2 cathode follower, Whatever your favorite PI tube is, alot of people like the Sovtek LPS but I like NOS Sylvania 12ax7.
Got it.

2 out of 3 of the filter caps are original (circa 1989). I have one on hand, so when I order tubes I'm also gonna order another 50/50 500V F&T filter cap.

The original choke is riveted into the chassis, so I gotta drill out the rivets to get it outta there. :evil:
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Re: Marshall 2203 REEEEEEEEEEE-work

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PLX wrote: Sun Jul 03, 2022 4:20 am


2 out of 3 of the filter caps are original (circa 1989). I have one on hand, so when I order tubes I'm also gonna order another 50/50 500V F&T filter cap.

The original choke is riveted into the chassis, so I gotta drill out the rivets to get it outta there. :evil:
If they are original yo might as well replace them all with new. Does this amp have the same filtering as a Marshall superlead. 50uf mains , 50uf screens 50uf/50uf preamp and 100uf PI

FT's are good filter caps I still have them in my 68 build but I have 32uf/32uf Erie for the preamp everything else is F&T and have no desire to swap them out but I started using the ARS 50/50uf caps in my 69 as they are most like the old LCR cap Marshall used back in the day. Some people say the F/T's are grainier sounding but I don't hear that at all but I do like the new ARS caps they are fullsized in height like the old LCR's. I bought enough to have here to recap all my amps when that they are due if ever.
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Re: Marshall 2203 REEEEEEEEEEE-work

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harddriver wrote: Sun Jul 03, 2022 4:47 amDoes this amp have the same filtering as a Marshall superlead. 50uf mains , 50uf screens 50uf/50uf preamp and 100uf PI
Originally, the amp had two LCR 50µF/50µF.

When I rebuilt the amp to be a JCM-800 I added the 32µF/32µF pre-amp filter cap.

That one I added during the rebuild is relatively new. It's those two tall LCR caps that are over 30 years old.
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Re: Marshall 2203 REEEEEEEEEEE-work

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The Tung Sol Reissues sound very close to my Sylavania longplates 12ax7A's but handle higher gain better without getting the dreaded plate ring like sometimes happens with the Sylvania longplates.

I used the Ruby chinese 8th generation in the CF it's quiet and handle the HV of the CF, JJ's work good here as well but are dark compared to the HGAC5 Ruby's which are brighter.
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Re: Marshall 2203 REEEEEEEEEEE-work

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harddriver wrote: Sun Jul 03, 2022 4:47 am Does this amp have the same filtering as a Marshall superlead. 50uf mains , 50uf screens 50uf/50uf preamp and 100uf PI
It's 50µF/50µF mains, 50µF/50µF screens, and 32µF/32µF pre-amp.

So, lowering the value of the pre-amp filter cap makes the amp feel different in what way ?

The early 100W Marshalls had 16µF/16µF on pre-amp, 32µF/32µF on the screens, and 100µF for the mains.



edit: So, I have a stash of filter caps, and I'm gonna rebuild with 16µF/16µF on the pre-amp, 32µF/32µF on the screens, and 100µF (50µF/50µF jumpered) on the mains. See how that feels.

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Re: Marshall 2203 REEEEEEEEEEE-work

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I wouldn't go lower than 32uf/32uf on the preamp it tends to lead to ghosting. I also like 100uf on the PI versus 64uf. So with just three total can caps I am assuming on half of one can is connected to your screens and one to your mains, then one side for each preamp feed and finally one 50/50 in series for 100uf for the PI? My mains and screens on my 68 is whatever stock 68 Marshall's had and they are all F&T axial caps.

I like the standard 69 filtering scheme just as much but you can go full on 68 plexi if you want to try it and see what you think about it. Even with the 68 plexi filtering I've tried the stock 64uf and liked the 100UF on the PI the best. The amp seemed to lose backbone with the 64uf on the PI.

Those LCR's might actually still be good, I have LCR's in my 72 and 79 from around 1990 when they replaced and I don't have any inclination to replace them now, I have new one ready to go. I still see 60's 70's Marshalls with original filters cap cans so YMMV. Only if you question them would i replace them. If the amp got played regularly I wouldn't worry about it. Maybe just pick up a set on news and have them ready to go. Or if you want to change them out it isn't going to hurt anything.......
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Re: Marshall 2203 REEEEEEEEEEE-work

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harddriver wrote: Sun Jul 03, 2022 5:32 pm I wouldn't go lower than 32uf/32uf on the preamp it tends to lead to ghosting. I also like 100uf on the PI versus 64uf. So with just three total can caps I am assuming on half of one can is connected to your screens and one to your mains, then one side for each preamp feed and finally one 50/50 in series for 100uf?
Here's the layout I'm using:

Image

Image
harddriver wrote: Sun Jul 03, 2022 5:32 pmThose LCR's might actually still be good, I have LCR's in my 72 and 79 from around 1990 when they replaced and I don't have any inclination to replace them now, I have new one ready to go. I still see 60's 70's Marshalls with original filters cap cans so YMMV. Only if you question them would i replace them. If the amp got played regularly I wouldn't worry about it. Maybe just pick up a set on news and have them ready to go. Or if you want to change them out it isn't going to hurt anything.......
When I order tubes, I'm going to go ahead and get the filter caps you recommend - that's an easy change, even after the amp is built.

The 33-year-old LCR's test within tolerance on my meter's capacitance setting. They aren't misshapen either, so you're probably right about that.
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Re: Marshall 2203 REEEEEEEEEEE-work

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I'm feelin' the REEEEEEEEEE
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Re: Marshall 2203 REEEEEEEEEEE-work

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lll wrote: Sun Jul 03, 2022 7:29 pmI'm feelin' the REEEEEEEEEE
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Re: Marshall 2203 REEEEEEEEEEE-work

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PLX wrote: Sun Jul 03, 2022 11:54 am
harddriver wrote: Sun Jul 03, 2022 4:47 am Does this amp have the same filtering as a Marshall superlead. 50uf mains , 50uf screens 50uf/50uf preamp and 100uf PI
It's 50µF/50µF mains, 50µF/50µF screens, and 32µF/32µF pre-amp.

So, lowering the value of the pre-amp filter cap makes the amp feel different in what way ?

The early 100W Marshalls had 16µF/16µF on pre-amp, 32µF/32µF on the screens, and 100µF for the mains.



edit: So, I have a stash of filter caps, and I'm gonna rebuild with 16µF/16µF on the pre-amp, 32µF/32µF on the screens, and 100µF (50µF/50µF jumpered) on the mains. See how that feels.



Image
I think I see a new choke sitting alongside the LCR filter caps!!!!!!!!!!!!! :lol: :lol: :lol: :lol: :lol:
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