The secret EVH amp part

[awangotango]

anyone whose put an echoplex boss eq and mxr phaser (or any vintage pedal) in front of a marshall knows it kills all the low end.....Also, when you max out a greenback, the low end lessens....people with masters and attenuators pumping 3-15 watts into their 100w cab are not going to get their reproduction rig to behave the way his original gear did and will spend eternity searching for the missing part...

[efraser68]

Can you imagin Foo Fighters with a couple of stacks of pure gold... cranked to their limit... that would suite them MUCH better than how their guitars sounds with the amps they're playing...
matter of taste ofcourse...

He he... a revolution going on, guys

Ralle, I think they (the Foo Fighters) are already getting there. Chris Shiflett has been using Friedman's on tour for a couple of years. I'm also a part of a Foo Fighters tribute band and will faithfully be using my 12 series

[neikeel]

sorry to derail the topic. did we figure out what the secret part was yet?

No one listened tho'

[Ralle]

Ok, back on track...
I'm not sure if the "secret " is going to be discovererd and proven real... thing is I'm really not sure there was a secret thing from the beginning... maybe an odd value in a couple of places... I know I jerked around with the bias resistors a couple of years ago, and i got very fond of 68k... a friend of mine claimes he have heard somewhere that Eddie had 82k... not a bad option really...
Again, I'm refering to the real early days before and during the first album... After that god knows what went on in there, and I don't care really...
I had a -69 metalface superlead back in the day that had 68k in there STOCK... a regular superlead with 68k bias resistors stock from the factory... I can tell you that the lows was one of the things I didn't have any problems with, so to speak...
That's one odd ball part... 2x20uF in the preamp section is another... 33k NFB resistor etc, etc...
Anyone else that remembers any odd value in their amps?

[fivecoyote]

But the thing that confuses me is the everything on 10 factor. Now I and others turn it down on the bass knob. If Ed had the legendary everything on 10 thing then theres a clue right there. Somethin is different if thats true.

DC, isn't there something about old Marshalls if the bass is on 10 it's sort of at zero? Something cuts out? You can tell I'm not an amp builder, but believe I remember reading that somewhere here, either Mark A. or Friedman or someone. George can you help? S78?

Re: no bass, yes, like AC/DC, older tones. Ed also hits the strings stupidly hard, like Malcolm Young, which definitely probably gives him more "gain."

tx awango re: woodytone. You referring to the Fair Warning post? I've tried most of the gear, my own or others, but no Echoplex or vintage cabs. Sorta not concerned with mics/recording because so much can go down there, just trying to match the room sound with what I hear on the records.

also sorry re hijacking

[neikeel]

Putting a 0.0022uF cap in series with the on board PI cap and the treble pot wiper effectively cuts a lot of bass out of the signal, on a lot of superleads it is done early in the signal chain (V1b coupler) but if you do it later then the effect is the same as dialling out a lot of bass, ie the tone in the clips. The later 0.022uF PI output caps pass full signal anyway.

Try a 0.0022uF or even smaller

[JimiJames]

Try a 0.0022uF or even smaller

Like these 3300pf ? (0.0033µF)

[neikeel]

Try a 0.0022uF or even smaller

Like these 3300pf ? (0.0033µF)

yes certainly try those first..............but maybe 1000pF

[JimiJames]

"...yes certainly try those first..............but maybe 1000pF

Well, in that case, I have enough for everyone to try that posted in this thread !

[Velva]

There is one part that doesn't get talked about much either... and that is the choke. His amp had an open framed choke common on early 70's JMP (50 /100w). I'm pretty sure (correct me if I'm wrong) no 1968 100 watters had that choke unless Ed's amp was truly an odd ball. I know that choke from the factory is rated at about 100ohm / 3H. In terms of spec, it probably isn't any different than the original choke found on a 1968 100 watter but I wonder if the construction of that choke (looks like a small transformer) influences the tone in some other way. Other variables? Just throwing that out there. Has anyone build a clone with that exact choke?

[Strat78]

Has anyone build a clone with that exact choke?

Yes.
https://www.flickr.com/photos/120665708 ... 708928745/

[neikeel]

There is one part that doesn't get talked about much either... and that is the choke. His amp had an open framed choke common on early 70's JMP (50 /100w). I'm pretty sure (correct me if I'm wrong) no 1968 100 watters had that choke unless Ed's amp was truly an odd ball. I know that choke from the factory is rated at about 100ohm / 3H. In terms of spec, it probably isn't any different than the original choke found on a 1968 100 watter but I wonder if the construction of that choke (looks like a small transformer) influences the tone in some other way. Other variables? Just throwing that out there. Has anyone build a clone with that exact choke?

If stock = same specs. The only different spec choke was the 20H RS type with DCR 690ohms. The '68 used a Dagnall C1999 (at least mine does). The later bell cover types are still 3H. Unless the choke was off something else?

[stef]

Tubes and pots are the "secret" parts.

The EL34's are fuzzy, grainy and mushy sounding in my amp with "everything on 10". The 6CA7's are different - much cleaner, clearer and tighter in the lows, more open sounding, with two tubes pulled the bass (on 10) is even tighter and it really sounds like VH1. Don or Ted have already given that "secret" in an interview...
NOS or old used but healthy pre amp tubes are also important!

Now the pots.... I've already posted this link... The recipe for "plexi sound" is the more is the better
"here is a '68 SL with CTS pots:

Vol 2 = 1.273M
Vol 1 = 1.169
Treble = 271.2
Middle = 31.08
Bass = 1.086
Presence = 5.949

More to follow if you want?"


http://vintageamps.com/plexiboard/viewt ... 5&start=15

[Roe]

Putting a 0.0022uF cap in series with the on board PI cap and the treble pot wiper effectively cuts a lot of bass out of the signal, on a lot of superleads it is done early in the signal chain (V1b coupler) but if you do it later then the effect is the same as dialling out a lot of bass, ie the tone in the clips. The later 0.022uF PI output caps pass full signal anyway.

Try a 0.0022uF or even smaller

actually, a 2n2 preserves the bass needed for guitar purposes (cf. Aiken's webpage). just a single 1nf cap also reproduces 82hz, with a stock LTPI. There is one exception though: the impedance and bass response can change during heavy clipping (cf. highgain preamp and PPIMV). 22nf is completely overkill and can actually cause blocking distortion

[Roe]

Tubes and pots are the "secret" parts.

The EL34's are fuzzy, grainy and mushy sounding in my amp with "everything on 10". The 6CA7's are different - much cleaner, clearer and tighter in the lows, more open sounding, ...
"here is a '68 SL with CTS pots:

Vol 2 = 1.273M
Vol 1 = 1.169
Treble = 271.2
Middle = 31.08
Bass = 1.086
Presence = 5.949

More to follow if you want?"


http://vintageamps.com/plexiboard/viewt ... 5&start=15

yes, the tubes matter. you need much more NFB with el34s than with 6ca7s to get roughly the same result. also, the 6ca7s sound better with a variac than the el34s. and the pots usually read 30% high