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

[herbvis]

How loud was your master volume on the sample?

[bennyx]

i believe 1,5....no power attenuator

[bennyx]

the right infos are: 2 shield tricks (first and second stages), no bright cap on gain pot, tone stack 33k/250pf (like #39 plexi supertremolo stock tone stack ), use old china nos.....Marshall g12-80 is always the right speaker....probably #39 have 47k/4ohm nfb....36 100k/4ohm.....just stock....so 39 sound just a little smooth

[herbvis]

Do you use 470k/2200pf treble peaker?

[bennyx]

the first treble peaker are like 34.....2n2/470k.....second are 470pf/470k (or second gain pot with 470pf bright)....mixer are stock 470k/470k/470pf....the value of stages are the same (2k7/680n - 10k/100n -10k - 820ohm/470n)

[CoffeeTones]

Benny, thanks for sharing the info. Your amp sounds good. For my preference, the bass sounds a little flat and notes do not bloom, in the clip posted above.

Which negative feedback value do you use?

I remember you replaced some filter caps a while back. Your amp sounded better to me right before you had trouble with filter caps. Do you have any of your videos / clips from that time, with WTTJ and Night Train?

Did you add a filter cap / node for the additional stage?

[bennyx]

36 don't have bass.....have a midbass....perhaps a bit too much treble.....i have remove the 470pf bright on mixer....and add a 100pf bright on gain....better.....
for the filter caps i left 3 Daly ..... the rest were replaced with ruby (Daly work a like)

NFB are Always 100k 4 ohm.....the amp and the mod are always the same......i have chaged only preamp tube and moved or remove some bright caps.....the secret are always the second shield trick......don't use 220pf on first stage

[CoffeeTones]

Thanks Benny. Are you sure that the Daly caps are performing well? Your tone is good but the low notes are flat, the amp seems to lack bounce, bloom and sustain.Your shielded wire, with no 220pF arrangement seems to be a good idea.

Some other things to try

1. 470k // 1000pF in place of 470k // 2200pF
2. 47pF bright cap on gain pot, with 100pF to 220pF on mixer

[bennyx]

Coffe don't think at bass.... you're obsessed by bass

sample is recorded with a mobile telephone at 1,5 volume....what you ear is bump of microphone proximity effect.....isn't a real bass.....36 don't have bass like 34.....Frank is an old skool modder.....isn't an high gain modder....his mod sound vintage, not modern.....

the head mounted Daly stock....LCR are also fine .... but unfortunately those are no longer on the market so I tried the most similar......think first the voicing.....don't make strange experiments

start from what we know..... if 34 was made for emulated 36 probably have similar component for the voicing....we know that the third stage was 10k and 36 which was bright even without bright cap.....try my scheme starting to a 1959 77' stock....and adding only 34 change....add a 10k stage with a treble peaker....you will find that it is very bright.....so we must find ways to do less bright .... and remove hiss....add a second shield trick on second stage....but with 220pf is too dark and don't twang....so remove 220pf...but it is still too bright.....so remove the bright cap on the mixer.....add a 100pf on gain and you made 36

[herbvis]

How about that 150k on the gainpot or the 22k pi tail

[CoffeeTones]

Coffe don't think at bass.... you're obsessed by bass

sample is recorded with a mobile telephone at 1,5 volume....what you ear is bump of microphone proximity effect.....isn't a real bass.....36 don't have bass like 34.....Frank is an old skool modder.....isn't an high gain modder....his mod sound vintage, not modern.....

the head mounted Daly stock....LCR are also fine .... but unfortunately those are no longer on the market so I tried the most similar......think first the voicing.....don't make strange experiments

start from what we know..... if 34 was made for emulated 36 probably have similar component for the voicing....we know that the third stage was 10k and 36 which was bright even without bright cap.....try my scheme starting to a 1959 77' stock....and adding only 34 change....add a 10k stage with a treble peaker....you will find that it is very bright.....so we must find ways to do less bright .... and remove hiss....add a second shield trick on second stage....but with 220pf is too dark and don't twang....so remove 220pf...but it is still too bright.....so remove the bright cap on the mixer.....add a 100pf on gain and you made 36

No Benny, I'm not obsessed with bass. I'm not attacking you. I am in fact trying to help your sound, but I will stop because you take it the wrong way.

Be glad if you do not detect the flat sounding low notes that sound out of tune. I did not say there was too much or little bass, just that the bass / lows sound is flat like dead strings.

I've not made any strange experiments. If so, what are they? Suggesting replacement of decades old, filter caps and small tweaks is no different from any assumptive mods you have tried. You seem unwilling to accept any ideas except you own, or maybe the tech that mods your amp for you.

How old are those Daly caps? Better yet, when did their production cease? They are more than likely not fit to be in an amp, considering their age, even if they are NOS.

All of the mods you just described are possibilities, but no more probable than any other #36 scheme that is in this topic, You have some good ideas, but not the only ideas. Keep and open mind, because even you had a better AFD tone before, than you do now.

[CoffeeTones]

How about that 150k on the gainpot or the 22k pi tail

Benny sent me his spec a while back. He does use the 150k to ground and 22k PI tail.

[rockgod212]

thanx for sharing benny, your amp sounds good.

im still using a modified version of caswells spec, and I couldn't be happier with it, so to each their own when achieving the AFD tone. I do love these old china pre amp tube's though.

[bennyx]

start to 1959 77' specs

shield trick on first and second stage

33k
2k7/680n stage
470k/2n2
150k on gain pot, 100pf bright
10k/100n stage
.022u
470k/470pf (or pot with 470pf bright)
10k stage
.022u
470k/470k (remove 470pf bright)
820ohm/470n stage

NFB 100k 4 ohm
Pres 100n
tail 22k
tone stack 33k/250pf

preamp tubes old china nos, 6550

low notes that sound out of tune.

cause i was the guitar out of tunes

Keep and open mind, because even you had a better AFD tone before, than you do now.

i don't believe it....now is exactly the same....

[CoffeeTones]

low notes that sound out of tune.

cause i was the guitar out of tunes

Keep and open mind, because even you had a better AFD tone before, than you do now.

i don't believe it....now is exactly the same....

Come on man, you never play the guitar out of tune

I think there are some substantial tone differences in the following and not just because of the recorder.

https://www.facebook.com/video.php?v=10 ... =2&theater

Compared to:
https://www.youtube.com/watch?v=WpOE71WeNNo
Pan speaker - https://www.youtube.com/watch?v=x2ruOcz4xxw