paul gilbert modded marshall

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Jeremy1283
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paul gilbert modded marshall

Post by Jeremy1283 » Wed Aug 06, 2014 8:19 pm

He is a Paul Gilbert modded marshall I took photos of awhile ago.. thought you guys would like the pics
http://s1295.photobucket.com/user/jerem ... 1.jpg.html

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Re: paul gilbert modded marshall

Post by white noise » Wed Aug 06, 2014 9:09 pm

Kinda looks like Lee Jackson's work.

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Re: paul gilbert modded marshall

Post by Jeremy1283 » Wed Aug 06, 2014 9:18 pm

Im just learning so it all looks the same to me. Lol

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Re: paul gilbert modded marshall

Post by Haze13 » Fri Aug 08, 2014 3:34 am

This silicon reminds me of CARR amps... Every part there is just coated with silicon!

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Re: paul gilbert modded marshall

Post by Jeremy1283 » Sat Aug 09, 2014 12:40 pm

I know. Why do they use so much silicon? :scratch:

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Re: paul gilbert modded marshall

Post by rgorke » Tue Aug 12, 2014 4:23 pm

white noise wrote:Kinda looks like Lee Jackson's work.
I am pretty sure Lee Jackson did some, if not all of the work on Paul's amps back in the '80s. I use to work with Lee's girlfriend at the time.
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Re: paul gilbert modded marshall

Post by Haze13 » Wed Aug 13, 2014 5:52 am

I see only 3 preamp tubes. One of them must be PI, so it's a 3-gain stage amp with CF+tone stack... Kind of JCM 800 with more gain.

Jeremy1283, I think CARR uses that much silicon because it's holds the parts together + if some part will touch another part it will not conduct. For true point to point wiring I look at "BC Audio" or Audio amps like Jadis. It's an ART to wire them like these guys do...

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Re: paul gilbert modded marshall

Post by Jeremy1283 » Wed Aug 13, 2014 3:36 pm

Haze13 wrote:I see only 3 preamp tubes. One of them must be PI, so it's a 3-gain stage amp with CF+tone stack... Kind of JCM 800 with more gain.

Jeremy1283, I think CARR uses that much silicon because it's holds the parts together + if some part will touch another part it will not conduct. For true point to point wiring I look at "BC Audio" or Audio amps like Jadis. It's an ART to wire them like these guys do...
What does a cf tone stack mean? Just the type of resistors.
I dont see that glue in any othet amps.. Well I'm learning. Thanks for the input.

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Re: paul gilbert modded marshall

Post by Haze13 » Fri Aug 15, 2014 10:34 am

CF - Cathode follower. In the Marshall schematics (Plexi, JCM800, JTM45 and others) it's what comes before the tone controls. Vb2 is the Cathode Follower.

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Re: paul gilbert modded marshall

Post by SteadyEddie » Fri Aug 15, 2014 2:02 pm

Haze13 wrote:CF - Cathode follower. In the Marshall schematics (Plexi, JCM800, JTM45 and others) it's what comes before the tone controls. Vb2 is the Cathode Follower.
Yeah, a cathode follower has no voltage gain, it doesn't boost, but it changes the output impedance to better drive the tone stack.
Some people mod the CF to a gain stage, to add gain to the amp. There are people who like and dislike this approach.

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Re: paul gilbert modded marshall

Post by Jeremy1283 » Fri Aug 15, 2014 2:18 pm

SteadyEddie wrote:
Haze13 wrote:CF - Cathode follower. In the Marshall schematics (Plexi, JCM800, JTM45 and others) it's what comes before the tone controls. Vb2 is the Cathode Follower.
Yeah, a cathode follower has no voltage gain, it doesn't boost, but it changes the output impedance to better drive the tone stack.
Some people mod the CF to a gain stage, to add gain to the amp. There are people who like and dislike this approach.
I gorcha! Do you loose the plexi tone if you make it a gain stage. Any time i change my 12 series to a 2203 preamp with a master volume it looses that plexi sound. Weird

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Re: paul gilbert modded marshall

Post by SteadyEddie » Fri Aug 15, 2014 3:19 pm

Jeremy1283 wrote:
SteadyEddie wrote:
Haze13 wrote:CF - Cathode follower. In the Marshall schematics (Plexi, JCM800, JTM45 and others) it's what comes before the tone controls. Vb2 is the Cathode Follower.
Yeah, a cathode follower has no voltage gain, it doesn't boost, but it changes the output impedance to better drive the tone stack.
Some people mod the CF to a gain stage, to add gain to the amp. There are people who like and dislike this approach.
I gorcha! Do you loose the plexi tone if you make it a gain stage. Any time i change my 12 series to a 2203 preamp with a master volume it looses that plexi sound. Weird
I never tried the mod. Some hot-rodded plexi-type amps like Splawn and so on (If I'm not mistaken) do this. I'm sure some people will say yes, and some people say no.

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Re: paul gilbert modded marshall

Post by Jeremy1283 » Mon Aug 18, 2014 2:03 am

Its a matter of taste.

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Re: paul gilbert modded marshall

Post by RACKSYSTEMS » Mon Aug 18, 2014 10:56 am

Yeah this is for sure a Jackson mod.
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Re: paul gilbert modded marshall

Post by joey » Thu Aug 21, 2014 11:32 pm

That amp has 4 preamp valves, the fourth is obscured by all the floating components and is between the 2nd and third preamp tube.

The circuit is mostly his m1000 circuit, but has his attenuator circuit as well which is basically another form of ppmiv. (Found on the later ampeg amps)

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