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 » Tue Nov 12, 2019 3:06 pm

dukeamps wrote:
Thu Nov 07, 2019 8:14 am
Its been awhile i hope all is well :)

New clip,

https://soundclick.com/share.cfm?id=13942473


:toast:
That sounds awesome!

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

Post by dukeamps » Wed Nov 13, 2019 9:26 am

Unique wrote:
Tue Nov 12, 2019 3:06 pm
dukeamps wrote:
Thu Nov 07, 2019 8:14 am
Its been awhile i hope all is well :)

New clip,

https://soundclick.com/share.cfm?id=13942473


:toast:
That sounds awesome!
Cheers Unique, glad you like it :)

Here is a clip of my 36 mod doing something else,

https://soundclick.com/share.cfm?id=13945375

:toast:

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

Post by Unique » Wed Nov 13, 2019 9:50 am

dukeamps wrote:
Wed Nov 13, 2019 9:26 am
Unique wrote:
Tue Nov 12, 2019 3:06 pm
dukeamps wrote:
Thu Nov 07, 2019 8:14 am
Its been awhile i hope all is well :)

New clip,

https://soundclick.com/share.cfm?id=13942473


:toast:
That sounds awesome!
Cheers Unique, glad you like it :)

Here is a clip of my 36 mod doing something else,

https://soundclick.com/share.cfm?id=13945375

:toast:

That's a pretty cool tune and the amp sounds great. It also sounds similar to #34 a little bit in that recording with some slight differences, but you can hear the resemblances. Nice job!

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

Post by dukeamps » Wed Nov 13, 2019 1:07 pm

Cheers Unique, have a nice day :)

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

Post by bmwfreq » Sat Nov 16, 2019 6:14 pm

Hey everybody!

It's been a while.

Anyway, for anyone that's using a PPIMV with their #34/#36 mod, I found a way to brighten up your tone at lower volumes. I've found that when using my PPIMV at lower volumes it's just not bright enough, so I remedied the situation.

Here's the schematic for anyone that's interested.

I'd appreciate comments from anyone that happens to try this PPIMV bright mod.

As always, try at your own risk. (-; (kidding)

PS: Well, it would appear that attaching the schematic is not an option. So, anyone that would be interested in getting a copy of the schematic just email me directly at bmwfreq64@gmail.com. Please indicate in the subject line "Need PPIMV Bright mod schematic."
1984 2203 JCM 800
(#34 mod)
1960AV 4x12
2x12 25 watt Greenbacks
2x12 Vintage 30's
[ ..... ]
| O O |
| O O |

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

Post by bmwfreq » Sat Nov 16, 2019 6:25 pm

On another note.

Can someone tell me what the ideal biasing point would be with the #34 mod? Maybe someone can tell me what their experience has been with this and what setting you've found to be the best. I've tried a lot of different settings and can't decide where it should be.

I've done a lot searching on the web for anything indicating what Adam Day or anyone for that fact used to set the #34 bias at. If anyone knows please let me know.

I've heard rumors that Slash's #34 was always set to 40mA's, but have not been able to confirm this.

Thanks in advance.
1984 2203 JCM 800
(#34 mod)
1960AV 4x12
2x12 25 watt Greenbacks
2x12 Vintage 30's
[ ..... ]
| O O |
| O O |

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

Post by CoffeeTones » Sun Nov 17, 2019 2:31 am

bmwfreq, recon where you got this PPIMV brighten idea? #11 maybe? I also came up with and posted this mod several years ago in the PPIMV thread.
CoffeeTones wrote:
Fri Aug 23, 2019 9:24 pm
Several things to try -

1. 10k to 27k input grid stopper, resistor (go too low and RF will be sometimes be heard unless other precautions are taken)
2. 100k metal oxide resistor in place of the current 100k, cathode follower, load resistor
3. smaller value or removed snubber cap across the stage 1 plate resistor
4. move stage 1 plate snubber cap to 2nd stage
5. 39k to 56k slope resistor
6. 1k stage 3 cathode resistor in place of 820r
7. different bright cap 120pF to 500pF (using 1M gain pot)
8. 500pF to 1.5nF bypassing 470k prior to gain pot instead of 2n2
9. Remove or lower the value of the PI "fizz" cap
10. Raise PI and preamp voltages 20 to 30 volts by reducing the dropping resistor prior to the PI filter cap (no lower than 3k dropper with 50uF PI filter cap)
11. 500pF or smaller value caps from the input lug to wiper of each element of the PPIMV pot (like a bright cap - a mod that I though up years ago but never really tried nor needed it)
12. 500k pre PI master pot
13. 500k gain pot with 180k to 330k to ground instead of 150k (higher value resistor to ground will bring more bass and increase gain)

One of the first eleven above will probably work for you, with least affecting the rest of the tone. They are sort of in order of how I would try them. The higher you go on the list, the more affect on gain and bass response. Possibly toy around with number 11 if you want to try and counteract the PPIMV affect and not mess with the full volume tone. No guarantees.

I would also recommend turning the preamp volume full up, the PPIMV full up and the pre PI master to .5 to 1 to begin with, then set the tone controls. That may not be what you are looking for, but it sounds great in my amps and the volume is low without the PPIMV mud.

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

Post by bmwfreq » Sun Nov 17, 2019 11:39 am

Sorry Coffee! :peace:

Just one of the many ways a diminishing memory will bite you in the ass. My apologies for assuming that my vast lack of electronic knowledge came up with this some how on my own.

Anyway, I'll be the first to give credit where credit is do. There's a reason why everyone turns to Coffee whenever they have a question about amps or electronics in general.

I hope this sets the record straight going forward. I will certainly add some credit changes to the schematic before sharing them with anyone going forward.
1984 2203 JCM 800
(#34 mod)
1960AV 4x12
2x12 25 watt Greenbacks
2x12 Vintage 30's
[ ..... ]
| O O |
| O O |

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

Post by dukeamps » Sun Nov 17, 2019 1:50 pm


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

Post by CoffeeTones » Sun Nov 17, 2019 2:06 pm

bmwfreq wrote:
Sun Nov 17, 2019 11:39 am
Sorry Coffee! :peace:

Just one of the many ways a diminishing memory will bite you in the ass. My apologies for assuming that my vast lack of electronic knowledge came up with this some how on my own.

Anyway, I'll be the first to give credit where credit is do. There's a reason why everyone turns to Coffee whenever they have a question about amps or electronics in general.

I hope this sets the record straight going forward. I will certainly add some credit changes to the schematic before sharing them with anyone going forward.
It's all good. We don't really own any of this stuff, but should try to keep history organized even though the info is public. It appears that Larry and I had this same idea years ago.

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

Post by novosibir » Sun Nov 17, 2019 10:41 pm

CoffeeTones wrote:
Sun Nov 17, 2019 2:06 pm
It appears that Larry and I had this same idea years ago.
... and who knows, who had this idea still years before.
But does this really matter? No it doesn't!
The only what matters in forums is, that everyone can catch the info, to make his personal baby as pleasant as possible for himself...
... as long as he isn't using the info for commercial use w/o mentioning the genius of the idea.
By any means I've never feared about, that anyone could rob the butter of my bread, if he's using my ideas commercial, but...
... hey mention it, in which head the idea was born :wink:

I've always been open and I've never hidden my knowledge, have shared it with others...
... but I hate those people, who've turned my ideas later to hers.

https://www.facebook.com/permalink.php? ... &__tn__=-R

Larry
The fault almost always is sitting in front of the amp :wink:

Larry's Website now with included Pix's Gallery

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

Post by CoffeeTones » Sun Nov 17, 2019 11:52 pm

Larry, do you use proximity coupling from emitters and recievers to your advantage when building and tuning your amps?

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

Post by novosibir » Mon Nov 18, 2019 8:15 am

CoffeeTones wrote:
Sun Nov 17, 2019 11:52 pm
... proximity coupling from emitters and recievers to your advantage...
Sorry but I don't get the sense of your question with my wimpy German's English :oops:
The fault almost always is sitting in front of the amp :wink:

Larry's Website now with included Pix's Gallery

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

Post by CoffeeTones » Mon Nov 18, 2019 9:31 am

I am speaking of aligning components or signal wires in such a way, the phase relations produce a certain effect you desire. :scratch:

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

Post by novosibir » Mon Nov 18, 2019 1:14 pm

CoffeeTones wrote:
Mon Nov 18, 2019 9:31 am
... aligning components or signal wires in such a way, the phase relations produce a certain effect you desire. :scratch:
Definitely and everywhere from the input to the output.
You can regard this as kind of a sub scheme, what isn't seen (even not assumed) in the schematic and probably the reason, why nobody has been able yet to copy a Larry amp sound.
The fault almost always is sitting in front of the amp :wink:

Larry's Website now with included Pix's Gallery

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