S.I.R. 100W SuperLead Schematic pt. II

Everything from original vintage Marshalls to reissues.

Moderator: VelvetGeorge

Post Reply
User avatar
CoffeeTones
Senior Member
Posts: 1030
Joined: Mon Oct 11, 2010 9:52 pm
Just the numbers in order: 7
Location: USA

Re: S.I.R. 100W SuperLead Schematic pt. II

Post by CoffeeTones » Sat Aug 28, 2021 9:53 pm

Another thing I thought of is your divider prior to stage 2. The series resistor is acting / cutting as a higher value grid stopper. Instead of a divider, I usually prefer the resistor to ground from the pot output lug only, with a 33k to 47k, normal grid stopper, or no stopper - depending on whether the amp needs it.

If I use a divider at all, it would be two 68k, or that same 68k divider with a 1n cap to ground, like some of the Cameron amps. All of that said, most of the time a 470k with parallel peaking cap prior to the pot, and resistor to ground from the pot wiper works well, plus there is a lot of adjustability with that.

This might not be perfect for your mod, but check out the divider / boost here http://www.prowessamplifiers.com/schema ... cstacy.pdf. Works good in some cases, but it's been years since I have experimented with this one. One difference being that there is a bypass cap which keeps the series, 470k resistor from behaving like a high value grid stopper as much, especially for the upper range. That is obviously adjustable as well.

dukeamps
Senior Member
Posts: 1221
Joined: Mon Mar 22, 2010 10:08 am
Just the numbers in order: 7
Location: Germany
Contact:

Re: S.I.R. 100W SuperLead Schematic pt. II

Post by dukeamps » Sat Sep 18, 2021 3:19 am

I will liven things up a bit with a couple of new clips.

Clip 1 without orig,

https://soundclick.com/share.cfm?id=14313719

Clip 2 with orig,

https://soundclick.com/share.cfm?id=14313718

:toast:

blacklabel
New Member
Posts: 27
Joined: Mon Jan 20, 2014 7:28 am
Just the numbers in order: 13492

Re: S.I.R. 100W SuperLead Schematic pt. II

Post by blacklabel » Sat Nov 13, 2021 5:31 am

hi guys, you have already talked about it years ago, but it would be impossible to search in the topic :D

Do you remember the video on youtube where Slash in studio plays jcm800 # 34 on the sofa? what did you know about the sound in that video? I remember that the eq on jcm800 could have been all at 6.
in the description it is written that the cab used is the 1960B: the speakers used were the V30 marshalls, right?
do you know which microphones were used: only sm57 or royer 121 too?
And has anyone managed to replicate this sound?
I'm trying with a sm57, maybe I'm wrong position of the mic on the speaker (I have v30 marshall)

I thought the sound was completely raw, without eq corrections, then I inserted the audio of the video in cubase to understand the EQ curve of the sound with the Fabfilter proQ3 plugin and as you can see in the image a 96db cut was definitely made at 10.5k and this eliminates the presence of very high frequencies. A low cut was also made, perhaps 18db at 80hz. I don't know what else. Did you notice this?

https://i.ibb.co/jftvLN0/EQ-FABFILTER-s ... htrain.jpg



Unique
Senior Member
Posts: 181
Joined: Wed Oct 02, 2013 12:48 pm
Just the numbers in order: 13492

Re: S.I.R. 100W SuperLead Schematic pt. II

Post by Unique » Sun Nov 14, 2021 8:29 pm

What your seeing with your EQ graph is the frequency response curve for the sum of everything used in the signal chain together. Not much help for the amp's sound alone. If you want that sound, if I remember correctly, he had all the knobs at 7, and not 6. If you scroll through the AFD videos slowly, you will catch them. There were some pics posted from the video here at one time of them. Slash was also using the older 'coke bottle' shaped Chinese 6550's in #34 at the time of this video. I'm not sure what the preamp tubes being used here were. However, I do know that the first camo tolex covered AFD100 prototype amp, from a pic of the amp before the Bataclan show, I saw he had a JJ in the PI. The AFD100's also came with a Marshall rebranded J.J. in the PI as well. Take that for what it's worth. Combine all of that with Santiago's #34 schem posted here, a Les Paul of some type, some APH-1's and you will have that sound, or a similar flavor of it. The rest will depend on your signal chain and how you have your pups set. I would imagine they used an SM57 for the mic since that was what Slash had always used up until his first solo album for his tracks. I hope this helps.

Unique
Senior Member
Posts: 181
Joined: Wed Oct 02, 2013 12:48 pm
Just the numbers in order: 13492

Re: S.I.R. 100W SuperLead Schematic pt. II

Post by Unique » Sun Nov 14, 2021 8:39 pm

Unique wrote:
Sun Nov 14, 2021 8:29 pm
What your seeing with your EQ graph is the frequency response curve for the sum of everything used in the signal chain together. Not much help for the amp's sound alone. If you want that sound, if I remember correctly, he had all the knobs at 7, and not 6. If you scroll through the AFD videos slowly, you will catch them. There were some pics posted from the video here at one time of them. Slash was also using the older 'coke bottle' shaped Chinese 6550's in #34 at the time of this video. I'm not sure what the preamp tubes being used here were. However, I do know that the first camo tolex covered AFD100 prototype amp, from a pic of the amp before the Bataclan show, I saw he had a JJ in the PI. The AFD100's also came with a Marshall rebranded J.J. in the PI as well. Take that for what it's worth. Combine all of that with Santiago's #34 schem posted here, a Les Paul of some type, some APH-1's and you will have that sound, or a similar flavor of it. The rest will depend on your signal chain and how you have your pups set. I would imagine they used an SM57 for the mic since that was what Slash had always used up until his first solo album for his tracks. I hope this helps.
I should add, after watching to video again, it sounds like they mic'd the cab up close (touching the grill, or an inch away) and straight on center, or maybe just slightly off center. Just play around with it until it sounds correct to you.

User avatar
CoffeeTones
Senior Member
Posts: 1030
Joined: Mon Oct 11, 2010 9:52 pm
Just the numbers in order: 7
Location: USA

Re: S.I.R. 100W SuperLead Schematic pt. II

Post by CoffeeTones » Mon Nov 15, 2021 9:05 am

Some of you might want to pick this apart https://www.youtube.com/watch?v=6l4xzGA11po

Unique
Senior Member
Posts: 181
Joined: Wed Oct 02, 2013 12:48 pm
Just the numbers in order: 13492

Re: S.I.R. 100W SuperLead Schematic pt. II

Post by Unique » Mon Nov 15, 2021 11:24 am

CoffeeTones wrote:
Mon Nov 15, 2021 9:05 am
Some of you might want to pick this apart https://www.youtube.com/watch?v=6l4xzGA11po
Been there and done that! This video came out right around the same time the AFD100 vlog came out. There's a lot of good info hiding in that video on how Slash has his pickups set. I would focus more on the beginning of the video, and how the pickups are set then and prior to them being taken out, as opposed to how they are after the new bridge is on and the pickups have been reinstalled. Also, keep in mind that Derrig would set his necks a little deeper with a slightly more shallow neck angle than how Gibson does it today. This can be a little deceiving when your trying to gauge the pickup height.

One thing I noticed, when comparing how Slash has his neck pickup set at the beginning of this video to older pics I could find of this guitar, as best as I could tell, it appears that the neck pickup has pretty much always been set the same, i.e., screw height and orientation, possibly the pickup height itself, since around the Snakepit days and on. I did find one pic from the UYI era that has the screw orientation different on the neck, but the low E was the same. I've yet to see a pic where the low E screw is different. In this pic, the low was the same as it is in the SD video, and rest of the screws went like this on the neck: E \ \ / / / While the bridge screws in that pic went like this, in the opposite direction: / / / \ \ \

The bridge on the other hand, from what I've seen when comparing pics, has went through some changes through the years, as far as these things go.

Surprisingly, I've found that screw orientation has a slight effect on the sound. Such as having the screw's slot run parallel to the string vs perpendicular, as well as crossing under it at a 45* angle. This could be mainly because even the slightest turn will affect the height to some degree, which can possibly affect the sound to some extent. To me, it seems to affect the sound of the pick attack the most, which can change the way a note sounds when played more so than chords. It's just something you need to try for yourself. Pickups and their screws are a simple thing to play around with to see what you hear. In the end, I found that what you see in the SD video, as far as screw height and orientation goes, sound the best when you get the pickup height right.

Post Reply