Slaving a Plexi Project

[vkaxeman]

I don't usually post my Marshall 1959HW amp mp3's in the Eddie Van Halen section but I did make me one of those Rockstah Line Out Boxes per Mark's diagram/spec and slaved my Marshall 1959HW that Rockstah helped me tweak to be dutch with a Marshall SLP Reissue. Sounds pretty FN good slaved and definetly leans toward the early EVH sound. At least to me anyway. So I thought I would share them.

wow! those sound so solid man - with that blooming spank. awesome.

can you please share some of the details of the spec on the amps?

...my Marshall 1959HW that Rockstah helped me tweak to be dutch ...

can you give the run down on this?
v1b cathode?
v1b coupler?
mixer?
v2a cathode?
tone stack?
fizz cap?
output couplers?

thanks man! more questions to come... but this would be a great starting point. much appreciated.

Thanks for the compliments RGalpin! and Extra Special Thanks to ROCKSTAH for helping me make a Killer sounding amp!

The Marshall 1959HW Rockstah Tweaks Amp current specs are:
v1a 330/820
v1b .68/820
v1a coupling .022
v1b coupling .022
vol1 bright 500p
tone stack 250p/56k
v2a .68/820
tone stack capacitors both .022
Phase Inverter Input capacitor .022
Output Coupling capacitors both .1
Screens 16u
Mains 32u
V3 PI 16u
Preamp 32u
Presence .1
220k resistor on V2 Pin 2
Mercury 7h Choke
Chinese 12AX7A Pre Tubes
JJ EL34 Power Tubes
Lar/Mar PPIMV
Georges Dagnall Clone OT
Georges Dual Tap PT on Low Voltage Tap
The full detailed history of me modding this amp with Rockstah's wisdom and guidance is here:
http://forum.metroamp.com/viewtopic.php?t=11549

The Marshall SLP reissue is 100% stock non-modified amp.
One of these.
http://www.marshallamps.com/product.asp ... de=1959SLP

I am using the PowerBrake and LineOut box just like Rockstah's setup. From the lineout to the Return in on the effects loop on the SLP to bypass the preamp section of the SLP. JCM800 1960a Cabinet with G12M-25 watt-75hz-16 ohm Greenbacks with 6402 cones.

[vkaxeman]

I don't usually post my Marshall 1959HW amp mp3's in the Eddie Van Halen section but I did make me one of those Rockstah Line Out Boxes per Mark's diagram/spec and slaved my Marshall 1959HW that Rockstah helped me tweak to be dutch with a Marshall SLP Reissue. Sounds pretty FN good slaved and definetly leans toward the early EVH sound. At least to me anyway. So I thought I would share them.

MP3's of my 1959HW Slaved via Line Out Box (Rockstah Spec) to SLP Reissue:

With GE10EQ:
http://soundclick.com/share?songid=7463221" onclick="window.open(this.href);return false;
http://soundclick.com/share?songid=7463226" onclick="window.open(this.href);return false;

No EQ:
http://soundclick.com/share?songid=7463230" onclick="window.open(this.href);return false;
http://soundclick.com/share?songid=7463233" onclick="window.open(this.href);return false;

With MXR 6 Band Blue EQ:
http://soundclick.com/share?songid=7463236" onclick="window.open(this.href);return false;

With GE10EQ again - changed settings:
http://soundclick.com/share?songid=7463242" onclick="window.open(this.href);return false;
Same as GE10 with changed settings and cranked the line out up some:
http://soundclick.com/share?songid=7463248" onclick="window.open(this.href);return false;

Mark did one hell of job on your amp!! Congrads!! Your playing is outstanding as well!

Thanks Dude!

[rgalpin]

cool!

i was just about to abandon some of those older coupling values .02 off v1b and .1s in the output.

but after hearing this clip, i know they can produce "that" sound.

220k in v2 pin 2. interesting!

hmmmm... using shielded wire anywhere?

if you've gone over this in the BIG thread, please forgive... but it is indeed very big with many iterations... lots to learn by observing the quest. but i appreciate you bringing us the current spec in reader's digest format. thx.

using shielded wire anywhere?

[vkaxeman]

cool!

i was just about to abandon some of those older coupling values .02 off v1b and .1s in the output.

but after hearing this clip, i know they can produce "that" sound.

220k in v2 pin 2. interesting!

hmmmm... using shielded wire anywhere?

if you've gone over this in the BIG thread, please forgive... but it is indeed very big with many iterations... lots to learn by observing the quest. but i appreciate you bringing us the current spec in reader's digest format. thx.

using shielded wire anywhere?

Yes, 48 pages is a lot to read to find a few answers indeed! The only shielded wire in the amp is on the LarMar PPIMV as per the Diagram Mark posted.

[blfrd]

I don't usually post my Marshall 1959HW amp mp3's in the Eddie Van Halen section but I did make me one of those Rockstah Line Out Boxes per Mark's diagram/spec and slaved my Marshall 1959HW that Rockstah helped me tweak to be dutch with a Marshall SLP Reissue. Sounds pretty FN good slaved and definetly leans toward the early EVH sound. At least to me anyway. So I thought I would share them.

MP3's of my 1959HW Slaved via Line Out Box (Rockstah Spec) to SLP Reissue:

With GE10EQ:
http://soundclick.com/share?songid=7463221" onclick="window.open(this.href);return false;
http://soundclick.com/share?songid=7463226" onclick="window.open(this.href);return false;

No EQ:
http://soundclick.com/share?songid=7463230" onclick="window.open(this.href);return false;
http://soundclick.com/share?songid=7463233" onclick="window.open(this.href);return false;

With MXR 6 Band Blue EQ:
http://soundclick.com/share?songid=7463236" onclick="window.open(this.href);return false;

With GE10EQ again - changed settings:
http://soundclick.com/share?songid=7463242" onclick="window.open(this.href);return false;
Same as GE10 with changed settings and cranked the line out up some:
http://soundclick.com/share?songid=7463248" onclick="window.open(this.href);return false;

WOW.

Definately like clips with the GE-10 and without it. The MXR 6 band makes it sound pretty muddy. Prefer the Boss EQ clips.
All the clips sound spot on to me!

So the 2nd Amp is stock?

[vkaxeman]

I don't usually post my Marshall 1959HW amp mp3's in the Eddie Van Halen section but I did make me one of those Rockstah Line Out Boxes per Mark's diagram/spec and slaved my Marshall 1959HW that Rockstah helped me tweak to be dutch with a Marshall SLP Reissue. Sounds pretty FN good slaved and definetly leans toward the early EVH sound. At least to me anyway. So I thought I would share them.

MP3's of my 1959HW Slaved via Line Out Box (Rockstah Spec) to SLP Reissue:

With GE10EQ:
http://soundclick.com/share?songid=7463221" onclick="window.open(this.href);return false;
http://soundclick.com/share?songid=7463226" onclick="window.open(this.href);return false;

No EQ:
http://soundclick.com/share?songid=7463230" onclick="window.open(this.href);return false;
http://soundclick.com/share?songid=7463233" onclick="window.open(this.href);return false;

With MXR 6 Band Blue EQ:
http://soundclick.com/share?songid=7463236" onclick="window.open(this.href);return false;

With GE10EQ again - changed settings:
http://soundclick.com/share?songid=7463242" onclick="window.open(this.href);return false;
Same as GE10 with changed settings and cranked the line out up some:
http://soundclick.com/share?songid=7463248" onclick="window.open(this.href);return false;

WOW.

Definately like clips with the GE-10 and without it. The MXR 6 band makes it sound pretty muddy. Prefer the Boss EQ clips.
All the clips sound spot on to me!

What are the specs you're using for the 2nd amp?

Thanks!
The 2nd amp is a Marshall SLP reissue and it is 100% stock non-modified amp.
One of these:
http://www.marshallamps.com/product.asp ... de=1959SLP" onclick="window.open(this.href);return false;

[blfrd]

Thanks for the link.

How loud was the 2nd amp?

[vanhalen5150]

That last one was candy to my ears.

[vkaxeman]

Thanks for the link.

How loud was the 2nd amp?

The SLP was Louder than nighttime bedroom level but not as loud as you would play it in a bar. Somewhere in between. Sounds awesome in front of it. Does not hurt your ears.

Master Volume / Overall Loudness is controlled by the Line Out Box. It is not set/controlled by the SLP at all.

[blfrd]

Thanks for the link.

How loud was the 2nd amp?

The SLP was Louder than nighttime bedroom level but not as loud as you would play it in a bar. Somewhere in between. Sounds awesome in front of it. Does not hurt your ears.

Master Volume / Overall Loudness is controlled by the Line Out Box. It is not set/controlled by the SLP at all.

This just confirms, for me, that the VH tone is completely accessible now.

Seems like the formula should be:

1. Amp 1
2. spkr output to load box
3. other spkr output to line level box
4. input to 2nd amp
5. spkr cab.

Now I just gotta get #3 and #4 and I'll be good.

[vkaxeman]

Thanks for the link.

How loud was the 2nd amp?

The SLP was Louder than nighttime bedroom level but not as loud as you would play it in a bar. Somewhere in between. Sounds awesome in front of it. Does not hurt your ears.

Master Volume / Overall Loudness is controlled by the Line Out Box. It is not set/controlled by the SLP at all.

This just confirms, for me, that the VH tone is completely accessible now.

Seems like the formula should be:

1. Amp 1
2. spkr output to load box
3. other spkr output to line level box
4. input to 2nd amp
5. spkr cab.

Now I just gotta get #3 and #4 and I'll be good.

3. Build the line out box that Rockstah provided details on.

4. Then buy one of these Effects Loops and put it in your 2nd amp:
http://metroamp.com/store/product_info. ... cts_id=499" onclick="window.open(this.href);return false; and connect to the return/in or wire the 2nd amp like Rockstah did in the beginning of this post.

Then your good to go!

[rgalpin]

Thanks for the link.

How loud was the 2nd amp?

The SLP was Louder than nighttime bedroom level but not as loud as you would play it in a bar. Somewhere in between. Sounds awesome in front of it. Does not hurt your ears.

Master Volume / Overall Loudness is controlled by the Line Out Box. It is not set/controlled by the SLP at all.

doesn't the 2nd amp react to how much level you feed it? it must. so, part of the tone is coming from how hard you feed it. right? i have never played with a setup where the power amp does not use the preamp section but i would imagine that there is still plenty of difference in tone based on how hard you hit it with amp 1 signal. ay?

[vkaxeman]

Thanks for the link.

How loud was the 2nd amp?

The SLP was Louder than nighttime bedroom level but not as loud as you would play it in a bar. Somewhere in between. Sounds awesome in front of it. Does not hurt your ears.

Master Volume / Overall Loudness is controlled by the Line Out Box. It is not set/controlled by the SLP at all.

doesn't the 2nd amp react to how much level you feed it? it must. so, part of the tone is coming from how hard you feed it. right? i have never played with a setup where the power amp does not use the preamp section but i would imagine that there is still plenty of difference in tone based on how hard you hit it with amp 1 signal. ay?

So far from what I can tell, the 2nd amp is merely amplifying relatively cleanly the overdriven amp1 sound being fed to it. If you push the Line out level too high you start pushing clipping type distorted crap into it. If too low, real thin, wimpy sound being amplified. I think what is happening here is the signal going to the effects loop goes in and out of the range acceptable to input that the effects loop can accept. There is a switch for +4dbv or -10dbv for the loop and it works best when set to +4dbv. Too me I don't see the 2nd amp reacting so much but the speakers and cab connected to it do based on the output level of the OT fed to them. Finding the sweet spot on the line out brings it too a fairly loud level and the speakers start to move and add their voice plus the cabs voice to the sound.
Sorry if this does not make sense, best I can do to put it into words.

[Strat78]

I don't usually post my Marshall 1959HW amp mp3's in the Eddie Van Halen section but I did make me one of those Rockstah Line Out Boxes per Mark's diagram/spec and slaved my Marshall 1959HW that Rockstah helped me tweak to be dutch with a Marshall SLP Reissue. Sounds pretty FN good slaved and definetly leans toward the early EVH sound. At least to me anyway. So I thought I would share them.

MP3's of my 1959HW Slaved via Line Out Box (Rockstah Spec) to SLP Reissue:

With GE10EQ:
http://soundclick.com/share?songid=7463221" onclick="window.open(this.href);return false;
http://soundclick.com/share?songid=7463226" onclick="window.open(this.href);return false;

No EQ:
http://soundclick.com/share?songid=7463230" onclick="window.open(this.href);return false;
http://soundclick.com/share?songid=7463233" onclick="window.open(this.href);return false;

With MXR 6 Band Blue EQ:
http://soundclick.com/share?songid=7463236" onclick="window.open(this.href);return false;

With GE10EQ again - changed settings:
http://soundclick.com/share?songid=7463242" onclick="window.open(this.href);return false;
Same as GE10 with changed settings and cranked the line out up some:
http://soundclick.com/share?songid=7463248" onclick="window.open(this.href);return false;

The No EQ clips and the last clip were realy REALY great! Not only is that a good VH tone, but a good tone period. Cool VH vibe in your playing too, I don't hear that too often, what a treat!

[vkaxeman]

The No EQ clips and the last clip were realy REALY great! Not only is that a good VH tone, but a good tone period. Cool VH vibe in your playing too, I don't hear that too often, what a treat!

Thanks Dude!