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

Everything from original vintage Marshalls to reissues.

Moderator: VelvetGeorge

Unique
Senior Member
Posts: 122
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 05, 2018 1:13 pm

BRMSlash wrote:
Sun Nov 04, 2018 3:24 am
Moved the NFB to the 8ohm tap. Changed the PPIMV resistance to a measured 220k-230k using a 1M resistor over the pot. Got rid of the cathode bypass cap and the snubber on the 3rd stage. Upped the 1st stage snubber cap to 220p. Got rid of the grid resistors on 2nd & 3rd stages. 3rd stage hot shield removed. Upped the 1st stage coupling cap to 22n. Final stage voltage divider returned to a more typical 470k//470p-470k arrangement. Increased the PI B+ node voltage.

http://sclk.co/s87ths
Very nice! What mic are you using to record with? One thing I've noticed with your samples is that you have good mic placement. I'm assuming you pretty much keep it in the same place when you record? Moving that mic just a little bit can completely change the sound on a recording, but it sounds pretty consistent in your recordings.

BRMSlash
Senior Member
Posts: 470
Joined: Sun Jul 18, 2010 9:00 pm
Just the numbers in order: 13492
Location: Australia

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

Post by BRMSlash » Mon Nov 05, 2018 10:08 pm

Thanks. I'm using an SM57, positioned about 25mm away from the baffle, aimed at the outer edge of the cone at a slight angle. Yeah, the placement is very sensitive. I've got it set up on a mic stand that has it's feet butted up against the cabinet. This helps me position it back to the same spot if I happen to move my cabinet. I haven't moved it for some time, so as you mentioned, all the clips should be fairly consistent.

Unique
Senior Member
Posts: 122
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 » Tue Nov 06, 2018 9:55 am

BRMSlash wrote:
Mon Nov 05, 2018 10:08 pm
Thanks. I'm using an SM57, positioned about 25mm away from the baffle, aimed at the outer edge of the cone at a slight angle. Yeah, the placement is very sensitive. I've got it set up on a mic stand that has it's feet butted up against the cabinet. This helps me position it back to the same spot if I happen to move my cabinet. I haven't moved it for some time, so as you mentioned, all the clips should be fairly consistent.
Your welcome. That's a great idea about having it set up against the cabinet in a way that helps you to keep in the same place. I couldn't help but noticed the consistency on your tracks with your recordings. I also figured you were using a SM57. That's what was used for Slash in the studio from AFD to SI, and probably at least first Snakepit album, as Mike Clink was the producer for these albums and has stated that's all he used on Slash's tracks. So if your going to try and nail the sound in a sample recording this mic is key as other mics will have a different sound and frequency response. So good choice! This is a great mic, and I love it for guitars.

BRMSlash
Senior Member
Posts: 470
Joined: Sun Jul 18, 2010 9:00 pm
Just the numbers in order: 13492
Location: Australia

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

Post by BRMSlash » Wed Jan 09, 2019 6:24 pm

I've made some progress. I've discovered the joys of Nichicon UPM / PM electrolytics as cathode bypass caps. They come in 0.47uF & 0.68uF capacitances! I'm liking a 0.68 UPM in the 1st stage cathode. Having a 0.47 UPM in the 4th stage works as well, but seems a bit too much in combination with the 1st stage electro. So I'm currently using a 0.68 UPM in the 1st stage, 0.1 MKT1813 in the 2nd stage & 0.47 MKT368 in the 4th stage.

Also managed to get hold of some 716p's for the presence cap. Very nice! Currently running in a 0.1uF 200v, but I also have the 400v to try.

User avatar
CoffeeTones
Senior Member
Posts: 932
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 » Wed Jan 09, 2019 10:09 pm

I've had some of the Nichicon UFW caps for a year or two. Just bought them because I was ordering a bunch of caps and said why not. I have yet to use them. I will keep your results in mind. Let us hear the new clip if you get the chance. If you don't mind, I'd like to see your schematic once you get satisfied.... for now, LOL
:toast:

BRMSlash
Senior Member
Posts: 470
Joined: Sun Jul 18, 2010 9:00 pm
Just the numbers in order: 13492
Location: Australia

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

Post by BRMSlash » Thu Jan 10, 2019 6:03 pm

I don't think the UFW's are as good as the UPM's when used as a cathode bypass. It doesn't appear that UFW's come in 0.68uF either. I've gone away from the Nichicon & Elna audio specific caps. They each have certain characteristics that are nice, but overall I can't get the desired overall tone. For cathode bypass duties, low impedance & large physical size seems to be the desirable attributes.

Yeah, will hopefully post a new clip over the weekend. Finally sourced the 3n3 & 4n7 X5F ceramic bright caps that I like as well (e.g. 562R10TSD33), so I'm trying them out. Also liking some Jupiter Red Astrons in the tone stack area for bit more treble grind character.

BRMSlash
Senior Member
Posts: 470
Joined: Sun Jul 18, 2010 9:00 pm
Just the numbers in order: 13492
Location: Australia

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

Post by BRMSlash » Sat Jan 12, 2019 12:37 am

3n3 bright cap, 400v 716p presence, 3x Jupiter Red Astrons in tone stack area.

http://sclk.co/r/s88ejq

User avatar
wdelaney72
Senior Member
Posts: 1601
Joined: Sun Jan 22, 2006 9:04 pm
Location: Chicago Suburbs

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

Post by wdelaney72 » Thu Jan 17, 2019 2:59 pm

BRMSlash wrote:
Thu Jan 10, 2019 6:03 pm
Yeah, will hopefully post a new clip over the weekend. Finally sourced the 3n3 & 4n7 X5F ceramic bright caps that I like as well (e.g. 562R10TSD33), so I'm trying them out.
562R10TSD33 is different than X5F....when I look that up on Mouser it shows it's the 562R Series with the Z5F delectric....are they one in the same?

1000pF X5F Series
https://www.mouser.com/ProductDetail/Vi ... %2fDQM8%3d

1000pF 562R Series
https://www.mouser.com/ProductDetail/Vi ... 2f3A9eY%3d
Walter

"There's no great thing in being a soloist. I think the hardest thing is to play together with a lot of people, and do it right." - Angus Young, 1984

User avatar
CoffeeTones
Senior Member
Posts: 932
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 » Thu Jan 17, 2019 3:56 pm

Those list two different dielectrics and operating temperatures initially but the .0033uF S series caps with X5F are different diameter than the 562 at least. Default lead spacings are different also. Both at 1kV.

BRMSlash
Senior Member
Posts: 470
Joined: Sun Jul 18, 2010 9:00 pm
Just the numbers in order: 13492
Location: Australia

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

Post by BRMSlash » Thu Jan 17, 2019 5:06 pm

There are variations within the 562R series depending on when/where they were made. The one with 10TS in the part number has the more desirable X5F dielectric. That's why it took me a while to find the 3n3 & 4n7 using X5F in the 562R series. The series must have changed over the years and I needed to find the right stock. I ended up finding them at x-on.com.au

Edit: Looking at the mouser link you posted, it is listed as Z5F, however the linked data sheet on the same page says the 562R should be X5F for the 1000pF version. Maybe a typographical error?

User avatar
wdelaney72
Senior Member
Posts: 1601
Joined: Sun Jan 22, 2006 9:04 pm
Location: Chicago Suburbs

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

Post by wdelaney72 » Sat Jan 19, 2019 2:39 pm

Shit playing...feedback on the tone is welcome.
My first 36 attempt:
Washburn LP style guitar with A2 PAF
Greenbacks
B, M, T, G1, G2 on 4
Master on 6
Presence 7

Spec A
https://www.soundclick.com/html5/v4/pla ... D=13832100
Walter

"There's no great thing in being a soloist. I think the hardest thing is to play together with a lot of people, and do it right." - Angus Young, 1984

BRMSlash
Senior Member
Posts: 470
Joined: Sun Jul 18, 2010 9:00 pm
Just the numbers in order: 13492
Location: Australia

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

Post by BRMSlash » Sun Jan 20, 2019 10:24 pm

Well done. Sounds nice.

BRMSlash
Senior Member
Posts: 470
Joined: Sun Jul 18, 2010 9:00 pm
Just the numbers in order: 13492
Location: Australia

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

Post by BRMSlash » Sun Jan 20, 2019 10:34 pm

The 3n3 bright cap gave too much low mid thickness that I couldn't adjust out. Now I'm back to a 2n2 bright, but with 1n over the following voltage divider. Changed all my B+ dropping resistors to 8k2 to bring all the preamp voltages up. Also reduced the size of my speaker cab cable from Canare 4s8 (13gauge) to Canare 4s6 (17gauge) to control the bass better. :thumbsup:

https://www.soundclick.com/html5/v4/pla ... D=13832586

User avatar
wdelaney72
Senior Member
Posts: 1601
Joined: Sun Jan 22, 2006 9:04 pm
Location: Chicago Suburbs

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

Post by wdelaney72 » Sun Jan 20, 2019 10:45 pm

I can hear the bright cap in yours compared to mine...I'm still at 1000pF....yours definitely sounds a touch more...sounds really good.

The recording of my track came out darker than it sounds n the room...regardless...it's such a killer sounding amp. It may not be 100% to the Levi 36, but it's really really close. I was able to adjust some to my liking. I have DC heater on V1 and it's a 2 channel amp with a stock plexi clean channel. Added some gain, increased the bass and I have a tone I really really like for my playing out.

I have one other spec to try out, but I'm going to hold for a while and just enjoy this one. I really like it.
Walter

"There's no great thing in being a soloist. I think the hardest thing is to play together with a lot of people, and do it right." - Angus Young, 1984

dukeamps
Senior Member
Posts: 1149
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 » Mon Jan 21, 2019 4:54 am


Post Reply