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

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

Post by Unique » Thu Feb 15, 2018 3:19 pm

There's old interview with Slash from Guitar World back in 1992 and Slash was asked what strings he used:

What kind of strings do you use?
Ernie Ball .010's.

He uses .11's now, but back in the day, with the tone everyone chases, he was using .10's with the Derrig in the studio. Here is the full article if anyone wants to read it. It's pretty good:

https://www.guitarworld.com/gw-archive/ ... -interivew

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

Post by CoffeeTones » Thu Feb 15, 2018 9:58 pm

BRMSlash wrote:
Wed Feb 14, 2018 7:22 pm
The current spec has all 22nF coupling caps.

1st stage is basically a 5nF superlead bright channel but with a 22nF coupling cap. There is also the mixer network after it, but with a 180k resistor to ground instead of a 470k into normal channel 1M pot.

I agree with @Unique's comments. I feel I'm reaching the limits of my guitar, cabs, speakers, mics, recording interface etc. I might try a different presence cap, 715p or 716p. My guitar isn't anything fancy (Epiphone snakepit model with upgraded pickups, wiring, pots, swithces & caps etc), so I think nicer tones could be achieved with a higher end guitar.
I also agree about the guitar, pickups and speaker setups. Voltages, tubes and cap types are big factors too. I know there are 6550, EL34 and 6CA7 tubes, many different speakers, guitars and pickups being used in this thread. Your amp sounds great but tweaking is part of the fun. I only comment and make recommendations to share experience and have fun.
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Re: S.I.R. 100W SuperLead Schematic pt. II

Post by Roe » Fri Feb 16, 2018 8:48 am

Unique wrote:
Thu Feb 15, 2018 3:19 pm
There's old interview with Slash from Guitar World back in 1992 and Slash was asked what strings he used:

What kind of strings do you use?
Ernie Ball .010's.

He uses .11's now, but back in the day, with the tone everyone chases, he was using .10's with the Derrig in the studio. Here is the full article if anyone wants to read it. It's pretty good:

https://www.guitarworld.com/gw-archive/ ... -interivew
he says: "And I think I used a Mesa/Boogie for certain lead lines"
Last edited by Roe on Sun Feb 18, 2018 3:54 pm, edited 1 time in total.
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Re: S.I.R. 100W SuperLead Schematic pt. II

Post by Unique » Fri Feb 16, 2018 1:11 pm

Roe wrote:
Fri Feb 16, 2018 8:48 am
Unique wrote:
Thu Feb 15, 2018 3:19 pm
There's old interview with Slash from Guitar World back in 1992 and Slash was asked what strings he used:

What kind of strings do you use?
Ernie Ball .010's.

He uses .11's now, but back in the day, with the tone everyone chases, he was using .10's with the Derrig in the studio. Here is the full article if anyone wants to read it. It's pretty good:

https://www.guitarworld.com/gw-archive/ ... -interivew
We says: "And I think I used a Mesa/Boogie for certain lead lines"
He used the Mesa as a feedback generator only. If you google it, you can find a diagram Adam Day made that shows how it was set up in the studio. One thing I've learned, you have to be able to read between the lines in these older interviews as Slash never gave out too much info about his recording process, and was more prone to giving out mis-information. But there is a hint of truth in most of what he says, you just have research it to find out the rest.

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

Post by Roe » Sun Feb 18, 2018 3:25 pm

yes, but that was not AFD but Use Your Illusion?
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Re: S.I.R. 100W SuperLead Schematic pt. II

Post by Unique » Sun Feb 18, 2018 4:02 pm

Roe wrote:
Sun Feb 18, 2018 3:25 pm
yes, but that was not AFD but Use Your Illusion?
Correct, that was UYI and not AFD.

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

Post by snakepit86 » Tue Mar 06, 2018 11:59 am

I think that @Unique is right, the best gear/guitar you have the best result you will get.

Playing good is important too, Benny plays good and the celphone clips he recorded kept us talking a few pages....

I've used a Gibson LP std with alnicos, a Greco LP std '79 with pearly gates, and noy a Gibson LPC '73 with burst buckers and its a KILLER soundind guitar, lots of highs, mids and bass, very percussive.

The pickups height on slash guitars changed over the years, i've seen very low, barely over the pickup rings and very high, just like the 91-93 tours, i think its depends a lot on Slash growing personal taste.

I've found that too close to the strings its hard to clean up and too far the sound gets thinner and weak, so lets experiment!

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

Post by bmwfreq » Tue Mar 06, 2018 1:05 pm

Hello, everyone!

It's been a while since I've posted anything here, but I'm having some issues with my #34. All of the highs and touch-sensitive and slinkiness seem to have gone away in my amp. I've re-capped; re-wired; re-tubed; re-biased; used different guitar and speaker cables; tried different speakers all to no avail.

Any idea as to where my awesome amp tone has gone??

Any info towards fixing my issue would be most appreciated.

PS: If I bypass the PPIMV, my amp has all of the highs in the world, but with the PPIMV engaged, my amp looses most of it's highs. Before my issue, the PPIMV had no affect on the highs. Hope this helps some.
1984 2203 JCM 800
(#34 mod)
1960AV 4x12
2x12 25 watt Greenbacks
2x12 Vintage 30's
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Re: S.I.R. 100W SuperLead Schematic pt. II

Post by Unique » Tue Mar 06, 2018 1:39 pm

snakepit86 wrote:
Tue Mar 06, 2018 11:59 am
I think that @Unique is right, the best gear/guitar you have the best result you will get.

Playing good is important too, Benny plays good and the celphone clips he recorded kept us talking a few pages....

I've used a Gibson LP std with alnicos, a Greco LP std '79 with pearly gates, and noy a Gibson LPC '73 with burst buckers and its a KILLER soundind guitar, lots of highs, mids and bass, very percussive.

The pickups height on slash guitars changed over the years, i've seen very low, barely over the pickup rings and very high, just like the 91-93 tours, i think its depends a lot on Slash growing personal taste.

I've found that too close to the strings its hard to clean up and too far the sound gets thinner and weak, so lets experiment!
Definitely do experiment. I believe pickup height is key to getting the sound right. If you set your pickups just right, with these mods (I have #34 in a '83 JCM 800 2203), you can increase that wah effect a bit and still retain a good narly, gritty sound. How you set your pickups will have a significant effect on your sound. I found a sweet spot with my guitar where that wah effect seems strongest, with good drive, where the notes seem to bloom a bit and can still clean up. For me, its between 3/32" and 4/32" on the bridge. Maybe a turn or so lower than 3/32", and about 4/32" on the neck. My main guitar is a Tokai Les Paul loaded with an '86 aph-1 in the bridge, and an '85 Jazz with an A2 magnet in the neck (which is an aph-1 before they came out a year later in '86) along with some 500k Centralab pots.

The Centralab pots sound different than the modern CTS pots that are out today. They are much brighter, more open, and even a little more aggressive sounding than what my CTS pots were. All of my CTS pots measured around 550k, and my Centralabs all measure just under 500k. So I was surprised when they were brighter in sound. My low E string went from sounding somewhat spongy, almost flabby at times, to being more tight and edgy sounding on both pickups. I think it's because the Centralabs are not as muddy sounding like what I experienced with my CTS pots. This is especially noticeable with the neck pickup. To me, the modern CTS pots have a lot of low-mids and mud associated with their sound. You don't realize it until its gone. The taper with the Centralabs is pretty amazing too, and different from modern CTS pots as well. Turning the volume knob from about 8 to 10 is almost like stepping on a distortion pedal. The taper is real shallow from 0-5, then gets a little steeper from about 6-8, then gets really steep from about 8-10.

I think these pots play a big role in Slash sound as well. He has some DiMarzio branded Centralab pots in the Derrig. I also believe the Centralab pots play a big part in the mojo behind those late 50's Burst. Now when I watch videos of Bursts on YouTube I can hear those pots contributing to their sound. It's like that open, dry, 'quack-like' sound you hear associated with those older guitars. It's hard to explain, but the next time you watch a video on YouTube of someone playing a Burst listen closely and you will hear it.

These are just some thoughts on my experiences with these components, other experiences may vary. I've learned a lot over the years from this thread, so I'm happy to give back what I can. But definitely, spend some time tweaking your guitar and you may dial in that last 2%-3% you feel you've been missing with your sound. You may be closer with your mod than you think.

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

Post by bmwfreq » Tue Mar 06, 2018 1:45 pm

Now, who do I know what owns a Tokai and can elaborate (and I do mean elaborate) on ANYTHING?

Hows the weather down there??? (-;
1984 2203 JCM 800
(#34 mod)
1960AV 4x12
2x12 25 watt Greenbacks
2x12 Vintage 30's
[ ..... ]
| O O |
| O O |

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

Post by Unique » Tue Mar 06, 2018 1:48 pm

bmwfreq wrote:
Tue Mar 06, 2018 1:45 pm
Now, who do I know what owns a Tokai and can elaborate (and I do mean elaborate) on ANYTHING?

Hows the weather down there??? (-;
It's beautiful, about 80* and sunny, with low humidity! How's the weather up there?

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

Post by Unique » Tue Mar 06, 2018 1:49 pm

bmwfreq wrote:
Tue Mar 06, 2018 1:45 pm
Now, who do I know what owns a Tokai and can elaborate (and I do mean elaborate) on ANYTHING?

Hows the weather down there??? (-;
Have you checked that pot with your DMM?

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

Post by bmwfreq » Tue Mar 06, 2018 2:04 pm

Which pot are you referring to?
1984 2203 JCM 800
(#34 mod)
1960AV 4x12
2x12 25 watt Greenbacks
2x12 Vintage 30's
[ ..... ]
| O O |
| O O |

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

Post by Unique » Tue Mar 06, 2018 2:14 pm

bmwfreq wrote:
Tue Mar 06, 2018 2:04 pm
Which pot are you referring to?
PPIMV pot.

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

Post by bmwfreq » Tue Mar 06, 2018 2:59 pm

The sweep (resistance) seems to be normal from closed to all the way open. I'm using a 250K dual pot with two 150K resistors to get my bias supply resistance to around 89K for a quad of 6550s.

Does anyone know how to test a choke or OT in a circuit, and what kind of readings I should get?? I have an extra set, and the resistance values of the choke and OT are the same as the components in my amp. Now, I know they may act differently when energized, and this is what I'm referring to when I ask about testing them in the circuit. I've done an exhaustive search online about this, and have found nothing specific to testing a choke or OT.
1984 2203 JCM 800
(#34 mod)
1960AV 4x12
2x12 25 watt Greenbacks
2x12 Vintage 30's
[ ..... ]
| O O |
| O O |

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