Just a note on those Sozo's. The black line denotes the outer foil side of the cap which should ideally be placed toward the ground side of the circuit. Something I learned from Mr Carlsons Lab. Does make a difference to the noise floor and performance of the cap.
I have an amp here in NZ that began life as a Ceriatone 18 watter. Then it was a JTM 45, and then a JTM 50. Now it is a JMP 1987 with the fancy pants bits like a Marstran OT and PT and mustard caps etc. I bought it as a platform for modding. I can see it is still shared cathode, but the only other thing I know about it is he said it is a '69 tone stack. He said he was going for Angus' Live At The Apollo tone (I think he actually used 2203s by then though) It sounds great for old school stuff, but does not really get into the more shreddy '80s tones that I am also into, no matter what kind of pedal I feed it. I want both from a single amp, but to not lose the good old school Plexi sound it currently has (with a treble booster and Gibson, it reminds me most of early MKII Deep Purple live tones). What I wonder if there a way to have multiple configs in one amp. The gnarliest Plexi, 2204, and Silver Jube configs (just the diode clipped lead channel). That way I'd have all my bases covered for the kind of tones I like. To do it so with every config sounding max legit is the thing though. I dunno if that's possible. What do you think? The old amp guy here in Auckland is ancient and semi retired now. I do not want to bother him with amp mods, so I have to find somebody else I can trust. I could do the split cathode myself, but beyond that I am out of my depth for now. Getting parts here in NZ is nigh on impossible too. Everything has to be imported. I end up just using Amplitube 5 instead of the amp, reactive load and IRs etc. I have to make up my mind what I want to do with the thing first. It changes every week, but Plexi thru to Jube seems about right for starters, maybe with some value refinements et cetera the modders know to get it all doing the thing right. P.S. I like the mods you did. Crispy, muting sounds tight, sings and rocks etc. All that stuff you need. It's morning here, so 'stuff' to describe 'things' will have to do.
I really enjoy your videos. If I can make one suggestion though, please try to tap less on all the components with your wooden pointer. When you listen with headphones it can be hard to hear you with all that tapping. I’m sure that in person you don’t notice it but it really comes through the mic. Again, really like the videos keep up the good work.
That 1985 does have reduced filtering. The vertical input models have 6 filter cans. Part way through 1984, Marshall switched to horizontal input, PCB-mounded pots, and reduced the filter cans from 6 to 5. Then, part-way through 1985, they reduced the filter cans again, from 5 to 3.
@@lovecraftmusic8717 What I've read is that Marshall reduced them to cut manufacturing costs. There was also some other change in 1986 that affected the sound a bit, I think the compression at higher volumes. I have a 1985 with 5 filter cans, which I sold a great-sounding, 6-can, 1982 2203 to buy because, personally, I prefer the horizontal-input sound, and some of my favourite albums, the early Smashing Pumpkins stuff, were recorded with it.
@@thischannel1071 well, if doesn't affect the sound too much it's ok for me...at the end of the day who can really play a 2203 at high volumes? 😂 Thanks BTW.
Great work mate. How many beautiful guitars do you have??? I don't think I've seen you do a vid that hasn't had a different guitar featured in it! lol. Another great vid, thanks, I'm starting to see similarities in all these marshal circuits, which for me is a huge thing and a credit to your work. I love that you are now also using your own vids to return to and check voltages of past mods, very cool...Any chance of a low wattage 6v6s Plexi build vid at any stage? 😎
My 1986 JCM 800 2203 horizontal inputs has three of those big blue filter caps. On your picture, the bottom two would be missing. Is there an advantage to having those two extra caps? Do people ever add the two that are missing?
DeOxit is the stuff for cleaning pots. The 0.68uF across the 820 ohm doesn’t add a lot of gain. Are you increasing the 10K in the power supply to 22K to reduce treble in the amp and to reduce the headroom so it distorts sooner? Who originally came up with this mod? The person should get credit for their good work.
Increasing that dropping resistor reduces the preamp voltages if course, but it sounds like you already know this. I call out that it's the Jake E. Lee mod, isn't it obvious what its based on?
I'm very impressed with the sound, playability and recording of your video, very well done, congratulations. I have a laney VH100R, they say it's based on the jcm800 channel 2. I'd like to add a bite of mid to this amp, I use 6L6, and celestion V30. Would it be the case to put 4 El34 and use the greenback? Thanks.
Great video, absolutely love the content! I have a Marshall JCM800 combo 4010. Now would this be possible on this amp as it's only a 50 watt amp, would it react the same ?
How do you discharge the caps? Can you show that step and do you test them after to be sure? And if you are changing caps, do you need to discharge? I remember on my vox they told me I could swap pots and some caps without discharging. I dont know if thats real or not so I didnt do it.
Why do you keep doing this to me? I keep learning cool shit and keep spending money on amps. It's beginning to look like an AC/DC back line in my basement!
i love amp guys who play guitar. not only do the amps sound great! but the feel better when playing too.
Just a note on those Sozo's. The black line denotes the outer foil side of the cap which should ideally be placed toward the ground side of the circuit. Something I learned from Mr Carlsons Lab.
Does make a difference to the noise floor and performance of the cap.
Mr Carlson's Lab...what a channel! Tnx for the tip Chris.
Good catch
I guess the police are coming for me because I installed them all wrong, but lucky me my amp is dead quiet, go figure
@@eyedunno8462 So you don´t believe in it?? Try to watch the video.
I have an amp here in NZ that began life as a Ceriatone 18 watter. Then it was a JTM 45, and then a JTM 50. Now it is a JMP 1987 with the fancy pants bits like a Marstran OT and PT and mustard caps etc. I bought it as a platform for modding.
I can see it is still shared cathode, but the only other thing I know about it is he said it is a '69 tone stack. He said he was going for Angus' Live At The Apollo tone (I think he actually used 2203s by then though) It sounds great for old school stuff, but does not really get into the more shreddy '80s tones that I am also into, no matter what kind of pedal I feed it. I want both from a single amp, but to not lose the good old school Plexi sound it currently has (with a treble booster and Gibson, it reminds me most of early MKII Deep Purple live tones).
What I wonder if there a way to have multiple configs in one amp. The gnarliest Plexi, 2204, and Silver Jube configs (just the diode clipped lead channel). That way I'd have all my bases covered for the kind of tones I like. To do it so with every config sounding max legit is the thing though. I dunno if that's possible. What do you think?
The old amp guy here in Auckland is ancient and semi retired now. I do not want to bother him with amp mods, so I have to find somebody else I can trust. I could do the split cathode myself, but beyond that I am out of my depth for now. Getting parts here in NZ is nigh on impossible too. Everything has to be imported. I end up just using Amplitube 5 instead of the amp, reactive load and IRs etc.
I have to make up my mind what I want to do with the thing first. It changes every week, but Plexi thru to Jube seems about right for starters, maybe with some value refinements et cetera the modders know to get it all doing the thing right.
P.S. I like the mods you did. Crispy, muting sounds tight, sings and rocks etc. All that stuff you need. It's morning here, so 'stuff' to describe 'things' will have to do.
Man I love your channel and content !! Thanks from Québec !
Hey man, thank you 🙏
I really enjoy your videos. If I can make one suggestion though, please try to tap less on all the components with your wooden pointer. When you listen with headphones it can be hard to hear you with all that tapping. I’m sure that in person you don’t notice it but it really comes through the mic. Again, really like the videos keep up the good work.
Duly noted
Sounds fantastic
That 1985 does have reduced filtering. The vertical input models have 6 filter cans. Part way through 1984, Marshall switched to horizontal input, PCB-mounded pots, and reduced the filter cans from 6 to 5. Then, part-way through 1985, they reduced the filter cans again, from 5 to 3.
What's the deal with the big caps? I have a 1989 2203 with 3.
@@lovecraftmusic8717 What I've read is that Marshall reduced them to cut manufacturing costs. There was also some other change in 1986 that affected the sound a bit, I think the compression at higher volumes. I have a 1985 with 5 filter cans, which I sold a great-sounding, 6-can, 1982 2203 to buy because, personally, I prefer the horizontal-input sound, and some of my favourite albums, the early Smashing Pumpkins stuff, were recorded with it.
@@thischannel1071 well, if doesn't affect the sound too much it's ok for me...at the end of the day who can really play a 2203 at high volumes? 😂 Thanks BTW.
Holly sh, love that tone.
Cheers!
Sweet jesus that sounded good!
Sounds good but I personally like no depth mod. Tried it and it kinda takes away from the Marshall punch.
Great videos man.
Super job
Did you still use the 2n2 to reduce bass in the preamp?
13:54 duudeeeeee.. i need it!
Ha ha, it’s the best!
Great work mate. How many beautiful guitars do you have??? I don't think I've seen you do a vid that hasn't had a different guitar featured in it! lol. Another great vid, thanks, I'm starting to see similarities in all these marshal circuits, which for me is a huge thing and a credit to your work. I love that you are now also using your own vids to return to and check voltages of past mods, very cool...Any chance of a low wattage 6v6s Plexi build vid at any stage? 😎
Ah....not enough guitars? Lucky to have most bases covered. Glad you are still digging videos Scotty!
My 1986 JCM 800 2203 horizontal inputs has three of those big blue filter caps. On your picture, the bottom two would be missing. Is there an advantage to having those two extra caps? Do people ever add the two that are missing?
DeOxit is the stuff for cleaning pots. The 0.68uF across the 820 ohm doesn’t add a lot of gain.
Are you increasing the 10K in the power supply to 22K to reduce treble in the amp and to reduce the headroom so it distorts sooner?
Who originally came up with this mod?
The person should get credit for their good work.
Increasing that dropping resistor reduces the preamp voltages if course, but it sounds like you already know this.
I call out that it's the Jake E. Lee mod, isn't it obvious what its based on?
6:20 are those preamp filament wires untwisted like that problematic?
I have a 85 2204 6550 power tubes.
But mine has White tolex and gold pin striping.
What does that mean
I'm very impressed with the sound, playability and recording of your video, very well done, congratulations. I have a laney VH100R, they say it's based on the jcm800 channel 2. I'd like to add a bite of mid to this amp, I use 6L6, and celestion V30. Would it be the case to put 4 El34 and use the greenback? Thanks.
Great video, absolutely love the content! I have a Marshall JCM800 combo 4010. Now would this be possible on this amp as it's only a 50 watt amp, would it react the same ?
Would the mod be different for an 89 2203 with three filter caps?
I don't hear much of a difference myself. Maybe its more of a feel thing than a sound thing .
Are 25v electrolytic caps too small?
How do you discharge the caps? Can you show that step and do you test them after to be sure? And if you are changing caps, do you need to discharge? I remember on my vox they told me I could swap pots and some caps without discharging. I dont know if thats real or not so I didnt do it.
Does the vertical input Sound a lot different?
Do you take out the 820r and put the .68 in place or on top? thanks
On top
@@HeadfirstAmps Awesome! Thanks
These aren't that much different than the Friedman's, or jose's circuit wise. Nevertheless a fine sounding amp. Good job ☺️
What does negative feedback do when increased? Can I lower the R22 stock 100k to 47k without doing the fixed depth mod?
It will probably give you a tighter and little less distorted sound, and yes you can.
thanks@@qddk9545
i dont see the bright cap on gain pot,is it hiding somewhere?
now i hear it mentioned,sorry
Have you ever tried the Phil x spec?
Pretty sure this amp gets very close to that in Ch2. The Phil X is essentially the BE channel stripped back with no switching bells and whistles.
What speaker?
Greenbacks
@@HeadfirstAmps thanks :) do you like 800s with v30 too? Bye fried
Greenbacks all the way for me
@@HeadfirstAmps I will try a new cab with greens in future, thanks friend.
Why do you keep doing this to me? I keep learning cool shit and keep spending money on amps. It's beginning to look like an AC/DC back line in my basement!
Ha ha ha, it's only real if you send me a picture!!
I did this mod to a Ceriatone 2204. The amp squealed like a pig with a motorboat sound through it. What could have caused this?
You probably dont know what youre doing or shouldnt be working on amps.
@@BigTyronie You look like a Tyrone.
@@BigTyronie maybe. But I'd like to learn
If you haven't already, join my FB DIY Group. Lots of help there if you are trying any of my mods.
@@HeadfirstAmps thanks
Who is Lake E Lee? You mean Jake? 😉
Lol
Doh! Fixed.
Bruce's sister.