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

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

Post by herbvis » Wed May 09, 2018 12:20 pm

nice, didn't know they were doing a single CD release.

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

Post by Unique » Wed May 09, 2018 12:57 pm

herbvis wrote:
Wed May 09, 2018 12:20 pm
nice, didn't know they were doing a single CD release.
I was a little surprised to when I saw it. I know one thing, one of the new songs added "Shadow Of Your Love" sounded pretty darn good remastered. The old original demo of it sounded like crap.

https://www.youtube.com/watch?v=aHUmy5PvPjQ

This is probably #36 or #39 Slash is using here if it is from the original sessions. He could of recently redid his parts too. I read not too long ago where Richard Fortus said they were in the studio recording "some of Slash's old material."

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

Post by Big Mike » Wed Jun 06, 2018 4:50 pm

Sounds good,. part of me wonders if the rhythm is Izzy's boogie though. It's got more that tone to it than the marshall tone.
Solo sounds like marshall.

Could be the mix.
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Re: S.I.R. 100W SuperLead Schematic pt. II

Post by BRMSlash » Wed Jun 20, 2018 4:34 am

So I've figured out where the harsh highs were coming from and managed to fix them. A lot of it was the Sozo NexGen caps. They have a nice clear tone, but there is a more pronounced, complex sounding, treble. I've since changed them all out for TAD mustards which have a similar sound, but the complex tones are shifted to the mids. The other source of pronounced highs were the cathode bypass caps that were rated higher than needed. I've dropped them back to a 100v dc rating and the treble has evened out. I had to make a few adjustments to bring back the clarity as well. I changed the PI fizz cap to a 2kV N750 ceramic which helped stabilise the treble too.

I've also been playing around with electrolytic caps and voltage ratings for the 1st stage cathode. Currently I'm using a 1uF 70V Mundorf ECap AC PLAIN.

http://sclk.co/s86k04

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

Post by Unique » Wed Jun 20, 2018 3:14 pm

BRMSlash wrote:
Wed Jun 20, 2018 4:34 am
So I've figured out where the harsh highs were coming from and managed to fix them. A lot of it was the Sozo NexGen caps. They have a nice clear tone, but there is a more pronounced, complex sounding, treble. I've since changed them all out for TAD mustards which have a similar sound, but the complex tones are shifted to the mids. The other source of pronounced highs were the cathode bypass caps that were rated higher than needed. I've dropped them back to a 100v dc rating and the treble has evened out. I had to make a few adjustments to bring back the clarity as well. I changed the PI fizz cap to a 2kV N750 ceramic which helped stabilise the treble too.

I've also been playing around with electrolytic caps and voltage ratings for the 1st stage cathode. Currently I'm using a 1uF 70V Mundorf ECap AC PLAIN.

http://sclk.co/s86k04
That sounds pretty darn good and a lot of the character is there. Nice job!

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

Post by BRMSlash » Wed Jun 20, 2018 7:38 pm

Thanks, I like it a lot too. I think the electrolytic cathode bypass probably needs a bit more time to burn in to bring out a bit more grind. I also tried a 4u7 50v Elna Cerafine, which I loved except for the lack of high end sweetness & chime. But the Cerafine's grind and attack is outstanding.

One other thing I'm considering is replacing the 180k resistor to ground after the 1st stage gain pot with another pot. The 180k is about as high as I can go and still keep the chime and cleans, but 220k or higher does give more of a grind and gain that some of the AFD songs have. I think it would useful to have it adjustable.

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

Post by jarrodthebobo » Wed Jun 20, 2018 10:29 pm

What exactly does the resistor to ground do on the preamp gain pot? Does it just add more gain the higher the volume or does it change the tone shaping somewhat?

I'd assume it'd just elevate the signal from ground, correct?
"I hear you knocking but you can't come in-
I know you've been drinking Gin." -Louis Jordan

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

Post by BRMSlash » Thu Jun 21, 2018 5:46 am

The resistor on the gain pot leaks more signal to ground, thus reducing gain, compared to a pot by itself (i.e. it cleans up the tone). As the value of the resistor is increased, less signal is bled off which leads to higher gain.

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