If the amp had a Jose master chances are it had other Jose mods that did not alter the chassis in any way, If the gain stage was cascaded I believe it would add gain. There was always something I heard in Ed's tone, mostly in the highs that just sound like a mild diode clipping. Really, no one knows but Ed and he's not talking. The only facts I know are Jose was his tech. Jose was working on an amp or something with Ed and that Marshall has a pot hole in the back. The rest.... Who knows.
Here’s the summary of EVH’s # 1 Marshall SuperLead ( as well as the possible spec changes to the Amp during its life span ) ….
Eddie’s Plexi was # 12301 and below is the spec from serial # 12267 Plexi ( 34 ‘units’ prior to Eddie’s ) ….
- split cathode V1a 250uF/820,V1b .68/820
- all coupling caps are 0.022uF, Bright channel coupling cap is 0.0022uF
- bright cap on volume pot 0,005uF
- 470k mixer resistors
- 470pF mixer bypass cap
- bypass cap on V2a is .68uF
- 33k/556pF tone stack combo
- 47k NFB resistor at 4 ohm tap
- 220k bias splitter resistors
- 0.1uF cap on presence control
- 47pf on PI
- Stock Output Transformer: 1.5 inch Dagnall ….
Next, when John Suhr saw the amp in 1991, it had a fat cap electrolyte ( probably 470uf ) in parallel with the stock .68uf on V2. So, since 1991 is a long time after 1977 …, take away the fat cap on v2 that John Suhr saw in 1991, and we get this:
- split cathode V1a 250uF/820,V1b .68/820
- all coupling caps are 0.022uF, Bright channel coupling cap is 0.0022uF
- bright cap on volume pot 0,005uF
- 470k mixer resistors
- 500pF mixer bypass cap
- bypass cap on V2a is .68uF
- 33k/500pF tone stack combo
- 100k NFB resistor at 4 ohm tap
- 220k bias splitter resistors
- 0.1uF cap on presence control
- .022uf output couplers
- 47pf on PI
At this point, the amp probably still had the stock Dagnall 1.5 inch output transformer …, although there’s absolutely no way to confirm that.
Transformer notwithstanding …, this is most likely the spec that the amp had when Eddie ( & Co ) recorded VH I …. And is also most likely prior to any supposed “modding” by Jose Arredondo… !
But in between VH I & VH II it’s generally accepted that Eddie’s tone changed ever so slightly. I can’t speak for everyone, but to me, it seems just a tad warmer …? And based on what I’ve read, this just might account for Jose’s involvement ?
It’s rumoured that if someone came in to his shop and complained that their amp was too bright, one of the first things he did was the “fat cap mod” ( cap on V2a is .68uF and a 220uf to 470uf ), which is what John Suhr saw when he worked on the amp in 1991.
Also, keep in mind that before John Suhr saw the amp, it may have already been to Steve Fryette to have the output transformer changed …,
…, “probably” to a VHT ( or maybe a Drake ) 2.0 inch output transformer ….
O.K., you’ve probably also noticed that there are a couple of other small differences:
1.) a 500pF mixer bypass cap instead of a 470pF mixer bypass cap
2.) 33k/500pF tone stack combo instead of a 33k/556pF tone stack combo
3.) 100k NFB resistor at 4 ohm tap instead of a 47k NFB, and …,
4.) 022uf output couplers that the earlier Plexi doesn’t seem to mention ….
These differences are most likely supported by Steve Fryette, John Suhr and Dave Friedman who all commented that the Amp was stock, but that “some” of the values were different than other Plexi’s from the same general date(s). For a short time there was even an argument over John Suhr’s statement that “most” of the solder joints were in fact un-tampered with ….
Fryette, Suhr and Friedman all seem to agree that these are just standard Marshall production variations. In fact, some people ( although not Fryette, Suhr or Friedman ) have even referred to the amp as “transitional” from the Plexi, to the Metal Panel era(s) ….
And keep in mind that both the 470uf and .68uf were replaced by a 330uf electrolyte at some point too. But, I don’t t list them in any of the specs above or below, because it’s generally accepted that they have now been changed back to what’s listed. And since it can’t be confirmed that he ever recorded with that configuration I left it out !
One other thing that is known and accepted is that Eddie sent the amp to Holland to Peter Van Wheelden to have it reconditioned. When that was being done, everything was re-wired with Teflon wire. Again, that’s all been reversed now by stripping another Plexi with a close serial number of all its original wiring and using it to once again re-wire Eddie’s # 1 …. That’s why none of that is listed in the specs either !
Finally, mixing back in in the John Suhr ( v2 fat cap and other mods ) we get this from Dave Friedman ( the most recent of the truly reliable source ) to have seen and worked on the amp.
- split cathode V1a 250uF/820,V1b .68/820
- all coupling caps are 0.022uF, Bright channel coupling cap is 0.0022uF
- bright cap on volume pot 0,005uF
- 470k mixer resistors
- 500pF mixer bypass cap
- bypass cap on V2a is .68uF and a 220uf to 470uf
- 33k/500pF tone stack combo
- 100k NFB resistor at 4 ohm tap
- 220k bias splitter resistors
- 0.1uF cap on presence control
- .022uf output couplers
- 47pf on PI
Drake 2.0 inch output transformer ….
Dave also is a little more specific on “the filtering”, which is:
2) 100uf's f & t in series mains
2) 32uf's f & t in series screens
1) 100uf lcr phase inverter
1) Dual 33 x 33 f & t preamp
* Dave’s last comments are to relate a quote from both Eddie and Matt Bruck, that finally the amp now sounds “like it did, back in the day” !