Mark Cameron Jose master volume schematic??

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rockstah
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Re: Mark Cameron Jose master volume schematic??

Post by rockstah » Mon Jan 17, 2011 12:05 pm

axeman wrote:Mark Cameron Confirmed the question someone had asked him, but he never said/agreed he use them for his Master.
all i can say is that i remember what i remember when i drew it.
Mark

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Re: Mark Cameron Jose master volume schematic??

Post by axeman » Mon Jan 17, 2011 12:09 pm

Trust me I have seen a few of his mods, and those components on the Master do not look like zeners, also I just finished modding a 2203 to the Aldridge mod, sounds good. no master though.

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Re: Mark Cameron Jose master volume schematic??

Post by rockstah » Mon Jan 17, 2011 12:13 pm

axeman wrote:Trust me I have seen a few of his mods, and those components on the Master do not look like zeners, also I just finished modding a 2203 to the Aldridge mod, sounds good. no master though.
what do they look like?
suhr's Aldridge mod?


...what happened to our signatures?

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Re: Mark Cameron Jose master volume schematic??

Post by Good Guest » Mon Jan 17, 2011 1:24 pm

You all realize that depending on manufacturere a zener can look exactly like your typical rectifier diode...and the only way to tell them apart is from the part # ..a visual doesn't really mean much in this case.....what means much is the zener braekdown volatge.

Then there is the possiblity that Jose used zeners that were germanium instead of silicone...Germanium behaves more tubelike when clipped than silicone....that is a possibility and I don't think they are even made any more. A person is probably better off using nothing unless they know for sure what was used...or better yet get a evh5150III ..anyone read the write up where Ed says it's chaulked full of all his tinkering mods from yesteryear....hellI I think there is even a couple of zeners in the signal path of channel 3...actually there is..
EVHZENERS.jpg
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axeman
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Re: Mark Cameron Jose master volume schematic??

Post by axeman » Mon Jan 17, 2011 1:48 pm

okay they are zeners, just more mystery to tone. Signature to me would be a stock Marshall, CVV-100 and a Fender. The MC mods are tweaks. I can't believe you called it! signature.

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Re: Mark Cameron Jose master volume schematic??

Post by Groovenut » Mon Jan 17, 2011 2:27 pm

The zeners on the 5150 III are 16v. I believe they are transient protection for the J113 mute JFET more than a clipper. You wouldnt ever really see a signal large enough to make them clip at that point in the circuit.
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Re: Mark Cameron Jose master volume schematic??

Post by rockstah » Mon Jan 17, 2011 2:28 pm

Groovenut wrote:The zeners on the 5150 III are 16v. I believe they are transient protection for the J113 mute JFET more than a clipper. You wouldnt ever really see a signal large enough to make them clip at that point in the circuit.
thats what i found with the original master posted. not enough to drive it.
Mark

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Re: Mark Cameron Jose master volume schematic??

Post by Groovenut » Mon Jan 17, 2011 2:36 pm

rockstah wrote:
Groovenut wrote:The zeners on the 5150 III are 16v. I believe they are transient protection for the J113 mute JFET more than a clipper. You wouldnt ever really see a signal large enough to make them clip at that point in the circuit.
thats what i found with the original master posted. not enough to drive it.
Mark
There should actually be plenty of signal later in the circuit where the original Jose Master was located (after 3 gain stages between the cathode follower and the tone stack). The should be somewhere between 50 and 90 VAC there (depending on the load) with the gain pot dimed. However with the 5153 they put them right after the gain pot. Typically you only see a max of 10 - 12 VAC signal there, not enough to clip with 16v zeners.
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Re: Mark Cameron Jose master volume schematic??

Post by Brian Wallace » Mon Jan 17, 2011 2:56 pm

http://hyperphysics.phy-astr.gsu.edu/hb ... miter.html" onclick="window.open(this.href);return false;
Patience is a virtue.

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Re: Mark Cameron Jose master volume schematic??

Post by rockstah » Mon Jan 17, 2011 4:46 pm

Groovenut wrote:
rockstah wrote:
Groovenut wrote:The zeners on the 5150 III are 16v. I believe they are transient protection for the J113 mute JFET more than a clipper. You wouldnt ever really see a signal large enough to make them clip at that point in the circuit.
thats what i found with the original master posted. not enough to drive it.
Mark
There should actually be plenty of signal later in the circuit where the original Jose Master was located (after 3 gain stages between the cathode follower and the tone stack). The should be somewhere between 50 and 90 VAC there (depending on the load) with the gain pot dimed. However with the 5153 they put them right after the gain pot. Typically you only see a max of 10 - 12 VAC signal there, not enough to clip with 16v zeners.
yes, but not in the existing plexi circuit as per the layout.

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Re: Mark Cameron Jose master volume schematic??

Post by briango » Mon Jan 17, 2011 5:44 pm

Seems there is enough signal on mine to drive it. :rock:


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Re: Mark Cameron Jose master volume schematic??

Post by axeman » Mon Jan 17, 2011 6:06 pm

I like how that sounds, still retains the Marshall tone. Good work. What did you do to that amp.

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Re: Mark Cameron Jose master volume schematic??

Post by vanhalen5150 » Mon Jan 17, 2011 6:15 pm

Briango, that amp has George Lynch tone to the max. What's the scoop?
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Re: Mark Cameron Jose master volume schematic??

Post by briango » Mon Jan 17, 2011 6:30 pm

Thanks guys...I wanted a late 70's/80's modded tone. That is a 50 Watt Metro with a Magnetic Components OT that I did the Plexi/JCM800 switchable and also added a #34 and SLO style modes. It has NOS Mustards in the pre and power section for the plexi and other 80's type caps in the other stages where the cascade is. It has low filtering and then a few changes in the interstage areas on the other modes. That clip is non cascaded straight up Plexi style but with a Master. I need to try some VH and see how it sounds.

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Re: Mark Cameron Jose master volume schematic??

Post by Good Guest » Mon Jan 17, 2011 6:38 pm

Forum doesn't seem to be responding to quotes right now...

Anyways regarding the zeners in the 5150III.....I agree they are there for bounding or protecting the fet, however it should be mentioned that the B+ for the 1st stage is 297 vdc and the plate resistor is 220K ...and with a bypassed cathode, all equaling a very high voltage gain, it is the high gain channel ...probably why they needed protection.

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