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

RagnarMarGunn · Post by **RagnarMarGunn** » Thu Oct 29, 2015 11:41 am

dukeamps wrote:
snakepit86 wrote: awesome, same specs as before? speaker? shure 57?
Cheers snakepit86,

Same spec, speaker G12H30 heritage, mic sm57, power tubes JJ e34l

here is three new clips with different preamp tubes,

JJ,

http://soundclick.com/share.cfm?id=13241691

Sovtek,

http://soundclick.com/share.cfm?id=13242011

Chinese,

http://soundclick.com/share.cfm?id=13242015

Cheers

Try JJ 6CA7 if you have a chance. They sound in between EL34 & 6550

BRMSlash · Post by **BRMSlash** » Fri Oct 30, 2015 6:48 am

So I ended up with cathode caps: 680n, 470n, 680n, 470n with 100n presence.

http://sclk.co/s7vu10

maxamus · Post by **maxamus** » Fri Oct 30, 2015 7:01 am

Prowler · Post by **Prowler** » Fri Oct 30, 2015 10:33 am

Well done Duke and BRMSlash! Sounds authentic! Tomorrow is modding time! I has been awhile since I have been modding my amp.

dukeamps · Post by **dukeamps** » Fri Oct 30, 2015 11:34 am

Cheers prowler,

So i think Sovtek preamp + el34 or 6L6s + G12H30 heritage + sm57 is the ticket,

el34s

http://soundclick.com/share.cfm?id=13242224

6L6s

http://soundclick.com/share.cfm?id=13242669

dukeamps · Post by **dukeamps** » Fri Oct 30, 2015 12:50 pm

Here is a short clip with my spec & the GH wttj guitar only track,

http://soundclick.com/share.cfm?id=13242688

herbvis · Post by **herbvis** » Fri Oct 30, 2015 4:05 pm

Great samples guys! Brm, your scom is sounding better!

bulldozer1984 · Post by **bulldozer1984** » Sat Oct 31, 2015 1:00 am

Hey Guys,

I have narrowed down the cause of the high frequency oscillation I get with all cathodes bypassed. If i put a cap to ground on the treble pot, the amp becomes stable. The problem, the cap needs to be at least 470pF to stop it, which kills too much high end there. What are some other methods ? Should I put a small cap on each plate ? Should I dump more high end early in the pre amp ? Obviously I am going to experiment, but I am curious if there is another method I don't know about.

@BRM, dude, your amp is spot on ! Don't touch it !

Roe · Post by **Roe** » Sat Oct 31, 2015 7:33 am

have any of you tried the celestion v-type? Its sort of a hybrid between a greenback and a v30 which may work well for slash tones?

rockgod212 · Post by **rockgod212** » Sat Oct 31, 2015 12:53 pm

not with my 36, but I use one with a g12h30 with my 50 watt plexi or jtm45, killer speaker over all.

Roe wrote:have any of you tried the celestion v-type? Its sort of a hybrid between a greenback and a v30 which may work well for slash tones?

herbvis · Post by **herbvis** » Sat Oct 31, 2015 4:49 pm

bulldozer1984 wrote:Hey Guys,

I have narrowed down the cause of the high frequency oscillation I get with all cathodes bypassed. If i put a cap to ground on the treble pot, the amp becomes stable. The problem, the cap needs to be at least 470pF to stop it, which kills too much high end there. What are some other methods ? Should I put a small cap on each plate ? Should I dump more high end early in the pre amp ? Obviously I am going to experiment, but I am curious if there is another method I don't know about.

@BRM, dude, your amp is spot on ! Don't touch it !

Move your tone stack wires. Pull them up, around, underneathh the board, etc etc. See if it affects the frequency of the oscillation. I have solved many squeeling issues with this method.

bulldozer1984 · Post by **bulldozer1984** » Sat Oct 31, 2015 7:21 pm

herbvis wrote:
bulldozer1984 wrote:Hey Guys,

I have narrowed down the cause of the high frequency oscillation I get with all cathodes bypassed. If i put a cap to ground on the treble pot, the amp becomes stable. The problem, the cap needs to be at least 470pF to stop it, which kills too much high end there. What are some other methods ? Should I put a small cap on each plate ? Should I dump more high end early in the pre amp ? Obviously I am going to experiment, but I am curious if there is another method I don't know about.

@BRM, dude, your amp is spot on ! Don't touch it !
Move your tone stack wires. Pull them up, around, underneathh the board, etc etc. See if it affects the frequency of the oscillation. I have solved many squeeling issues with this method.

Really ? Wow I would never of thought of that.. Thanks !

BRMSlash · Post by **BRMSlash** » Sun Nov 01, 2015 6:42 pm

Cheers!

In regards to oscillation, I had to put a 2k7 or 3k3 in series with the 3rd stage cathode bypass cap to prevent it. I recently tried taking that resistor out and oscillation was straight back, squealing away. I've also got one on the 2nd stage.

As far as treble bleed caps (plate bypass) mine are currently as follows from 1st stage to 4th stage: None, 470p, 1n, 470p. I've only just added the last 470p and haven't recorded with it yet.

BRMSlash · Post by **BRMSlash** » Sun Nov 01, 2015 11:05 pm

Here's a new, longer clip with the the 470p on the 4th plate resistor: http://sclk.co/s7vvlp

BRMSlash · Post by **BRMSlash** » Mon Nov 02, 2015 4:31 am

Hmm, I think 470p might be bit too much. But on the bright side, I've found that I really like the crunchy tone of 500v Y5P ceramics for treble bleed. 1kV Y5P's sound too clear and don't have that sweet break up. I prefer the Y5P's over C0G's too. More parts to order

Metropoulos Forum

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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