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

[CoffeeTones]

It's the PI tail resistor. Supposed to better balance the PI. Not connected to the master but to the 470r, PI cathode and 1M grid resistors and then to the .1uF / 4k7 resistor that goes to ground at the presence control. It will make the amp sound different. Good or bad, you decide.

[bmwfreq]

It's the PI tail resistor. Supposed to better balance the PI. Not connected to the master but to the 470r, PI cathode and 1M grid resistors and then to the .1uF / 4k7 resistor that goes to ground at the presence control. It will make the amp sound different. Good or bad, you decide.

Thanks, Coffee!

I did bypass the 22k using my resistor substitution box with a 22k resistor (dropping it to around 10+k) and I do think the amp sounds better with the 22k than it does with the stock 10k. So, it was a good change as far as I'm concerned. And if the PI is better balanced, well...two pluses.

Question: I know in the original #34 mod schematic as given by Santiago, it shows the shield cable with the shield connected to pin 1 of V1a. I have found that it sounds closer to the #34 tone if this shield is connected to ground, rather than pin 1 of V1a.

Why is this? Is there a possibility that the shield was connected to ground on the original #34, and Santiago just overlooked this, or just didn't take the time to indicate this when he corrected the schematic that was given to him? Has anyone else experienced this with their #34 mod??

[gibsonclassic2001]

It's the PI tail resistor. Supposed to better balance the PI. Not connected to the master but to the 470r, PI cathode and 1M grid resistors and then to the .1uF / 4k7 resistor that goes to ground at the presence control. It will make the amp sound different. Good or bad, you decide.

Thanks, Coffee!

I did bypass the 22k using my resistor substitution box with a 22k resistor (dropping it to around 10+k) and I do think the amp sounds better with the 22k than it does with the stock 10k. So, it was a good change as far as I'm concerned. And if the PI is better balanced, well...two pluses.

Question: I know in the original #34 mod schematic as given by Santiago, it shows the shield cable with the shield connected to pin 1 of V1a. I have found that it sounds closer to the #34 tone if this shield is connected to ground, rather than pin 1 of V1a.

Why is this? Is there a possibility that the shield was connected to ground on the original #34, and Santiago just overlooked this, or just didn't take the time to indicate this when he corrected the schematic that was given to him? Has anyone else experienced this with their #34 mod??

Connecting the shield to the ground is not cutting heights like the hot shield.
So it should be brighter with the shield to ground.

[bmwfreq]

It's the PI tail resistor. Supposed to better balance the PI. Not connected to the master but to the 470r, PI cathode and 1M grid resistors and then to the .1uF / 4k7 resistor that goes to ground at the presence control. It will make the amp sound different. Good or bad, you decide.

Thanks, Coffee!

I did bypass the 22k using my resistor substitution box with a 22k resistor (dropping it to around 10+k) and I do think the amp sounds better with the 22k than it does with the stock 10k. So, it was a good change as far as I'm concerned. And if the PI is better balanced, well...two pluses.

Question: I know in the original #34 mod schematic as given by Santiago, it shows the shield cable with the shield connected to pin 1 of V1a. I have found that it sounds closer to the #34 tone if this shield is connected to ground, rather than pin 1 of V1a.

Why is this? Is there a possibility that the shield was connected to ground on the original #34, and Santiago just overlooked this, or just didn't take the time to indicate this when he corrected the schematic that was given to him? Has anyone else experienced this with their #34 mod??

Connecting the shield to the ground is not cutting heights like the hot shield.
So it should be brighter with the shield to ground.

Exactly. And the original #34 is extremely bright. So, back to my original question:
"Is there a possibility that the shield was connected to ground on the original #34, and Santiago just overlooked this, or just didn't take the time to indicate this when he corrected the schematic that was given to him?"

[herbvis]

Frank confirmed the hot shield on #34.

[herbvis]

Breaking news guys, just got a email from frank levi, with detailed pictures of the actual #34 mods, he's used the slash AFD100 video to point them out, its pretty much the same as what we've all been doing. e.g.
the .1Uf over 10K V1A
.47Uf over the 820R
680Nf presence cap
150K on the volume.
And something to do with the screen lead from V1, but i can't work it out in the image, this is what frank said.
CHRISTIAN,
THE ATTACHED IS HOT OFF THE PRESS. YOU PROBABLY KNOW MOST OF THIS. I'M WORKING ON THE SCREENED LEAD DETAILS & HOPE TO GET THEM OFF TO YOU SOON. PLEASE BE AWARE THAT, IF YOU DO NOT USED THE SCREENED LEAD, THE CAPACITOR ACROSS THE 100K PLATE RESISTOR CAN BE ANYWHERE FROM 100pF TO 500pF ... DEPENDING ON HOW MUCH & AT WHAT FREQUENCY YOU ARE GETTING FEEDBACK FROM/TO THE GRID LEAD. I WOULD START AT 250pF, IF THAT DOESN'T WORK, 330pF OR 470pF.
CHEERS, FRANK
Unfortuantly i've been asked not to publish anything as it's franks copyright. But if anyone wants the image i can email i guess, not classed as publishing is it?

[bmwfreq]

Frank confirmed the hot shield on #34.

Hmmmmmmm. Well; all I can say is, my #34 mod sounds closer to the actual #34 with the shield connected to ground, than it does with the shield connected to pin 1 of V1a. The difference is night and day on my amp.

I'm just saying....

Plus; the AFD100 doesn't have a "Hot-shield". Just something to think about.

[bmwfreq]

Breaking news guys, just got a email from frank levi, with detailed pictures of the actual #34 mods, he's used the slash AFD100 video to point them out, its pretty much the same as what we've all been doing. e.g.
the .1Uf over 10K V1A
.47Uf over the 820R
680Nf presence cap
150K on the volume.
And something to do with the screen lead from V1, but i can't work it out in the image, this is what frank said.
CHRISTIAN,
THE ATTACHED IS HOT OFF THE PRESS. YOU PROBABLY KNOW MOST OF THIS. I'M WORKING ON THE SCREENED LEAD DETAILS & HOPE TO GET THEM OFF TO YOU SOON. PLEASE BE AWARE THAT, IF YOU DO NOT USED THE SCREENED LEAD, THE CAPACITOR ACROSS THE 100K PLATE RESISTOR CAN BE ANYWHERE FROM 100pF TO 500pF ... DEPENDING ON HOW MUCH & AT WHAT FREQUENCY YOU ARE GETTING FEEDBACK FROM/TO THE GRID LEAD. I WOULD START AT 250pF, IF THAT DOESN'T WORK, 330pF OR 470pF.
CHEERS, FRANK
Unfortuantly i've been asked not to publish anything as it's franks copyright. But if anyone wants the image i can email i guess, not classed as publishing is it?

I sent you a PM herb!!

[budubum92]

just got myself a Roland SRV 2000

[budubum92]

...

[herbvis]

Im jelly Id like to have one of those some day

What were your settings on your last clips?

[gibsonclassic2001]

anyone that can help me on this thread, id really appreciate it. im buying some cables tomorrow but unsure what type. help me here please

http://forum.metroamp.com/viewtopic.php?f=45&t=44194

Hi

Ive used mine in both mixingdesk and in the fx loop.
Fx loop is good enough.
Do a factory reset and set level on rear panel on the mark.

Did you get the user manual?
Its available online.

Btw test the secret delay also. Its great!

[budubum92]

anyone that can help me on this thread, id really appreciate it. im buying some cables tomorrow but unsure what type. help me here please

http://forum.metroamp.com/viewtopic.php?f=45&t=44194

Hi

Ive used mine in both mixingdesk and in the fx loop.
Fx loop is good enough.
Do a factory reset and set level on rear panel on the mark.

Did you get the user manual?
Its available online.

Btw test the secret delay also. Its great!

thanks for replying.

i understand ill use a MONO cable between my mic-preamp and SRV2000 input but what type of cable should i use on the outputs A and B? still MONO cables, stereo TRS cabe or what?

i want to use SRV2000 between my mic preamp and PC`s mic input.

[rockgod212]

without knowing what hardware/ software DAW system you are using, its hard to say. normally those effects are used as outboard gear with your DAW's fx loop, if it has one that is.

anyone that can help me on this thread, id really appreciate it. im buying some cables tomorrow but unsure what type. help me here please

http://forum.metroamp.com/viewtopic.php?f=45&t=44194

Hi

Ive used mine in both mixingdesk and in the fx loop.
Fx loop is good enough.
Do a factory reset and set level on rear panel on the mark.

Did you get the user manual?
Its available online.

Btw test the secret delay also. Its great!

thanks for replying.

i understand ill use a MONO cable between my mic-preamp and SRV2000 input but what type of cable should i use on the outputs A and B? still MONO cables, stereo TRS cabe or what?

i want to use SRV2000 between my mic preamp and PC`s mic input.

[budubum92]

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