Hot Rod Plexi 100w

Marshall Amp Discussion

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davesi
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Re: Hot Rod Plexi 100w

Post by davesi »

The Mojo cabs are not bad for the money are they? You going to build two?

D
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Structo
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Re: Hot Rod Plexi 100w

Post by Structo »

Man, every time one of you guys builds a new Marshall, it gets me jazzed.

Is the JCM 800 'thee' Marshall aside from a full stack Major. :shock:
I mean it seems that the Marshall designs can get a good sound with a 50w power amp.

I absolutely have no use for one but I want to build one! :lol:

Mark is this a 1959 circuit?
Tom

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M Fowler
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Re: Hot Rod Plexi 100w

Post by M Fowler »

davesi wrote:The Mojo cabs are not bad for the money are they? You going to build two?

D
Yes I'm building one for Derrick at Revv Amps and the other for myself.

The second one is prepunched 69 chassis from Valve Storm comes with blank front so I can drill my own faceplate design. This will be my first one using this new chassis and if all goes well I will build more.
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M Fowler
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Re: Hot Rod Plexi 100w

Post by M Fowler »

Structo wrote:Man, every time one of you guys builds a new Marshall, it gets me jazzed.

Is the JCM 800 'thee' Marshall aside from a full stack Major. :shock:
I mean it seems that the Marshall designs can get a good sound with a 50w power amp.

I absolutely have no use for one but I want to build one! :lol:

Mark is this a 1959 circuit?
Tom yes this is the 1959T chassis made into the AFD #39 and I'm using DarkBlueMurder's schematic. I call my amp the Hot Rod Plexi (HRP).
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andresound
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Re: Hot Rod Plexi 100w

Post by andresound »

M Fowler wrote:Colossal (Dave) and I got together on the faceplate design. Dave did the PDF for me and BNP laser did the plates.

It is a lot of punching and drilling but I enjoy that process of building.
I would love to build one of these. Do you perhaps have some faceplates available?
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M Fowler
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Re: Hot Rod Plexi 100w

Post by M Fowler »

Sorry no more plates left.
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JoeCon
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Re: Hot Rod Plexi 100w

Post by JoeCon »

Hey Mark,

Sir, I see what switch 2 does bringing in a bypass cap.
But what does switch 1 do? It looks like you're choosing another resistor but it's the same as the one already in the circuit....

Thanks
In theory, theory is the same as practice. In practice it's different.
John_P_WI
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Re: Hot Rod Plexi 100w

Post by John_P_WI »

If you are referring to switching the two 10k resisors, the switch parallels the two resistors halving the resistance.
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JoeCon
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Re: Hot Rod Plexi 100w

Post by JoeCon »

John

Thanks, I thought it was switching one or the other but see it now, doh!
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M Fowler
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Re: Hot Rod Plexi 100w

Post by M Fowler »

Yes it has two 10K resistors, you could play around with the switches to your taste but I built it just as shown.
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M Fowler
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Re: Hot Rod Plexi 100w

Post by M Fowler »

Derek from Revv amps arrived late last night on his way to visit some distributors along the way before NAMM, dropped off his Hot Rod Plexi for me to look over, I'll post the findings of why it died. :D

I run a Revv Generator 120 just for fun, shakes the whole house. :lol:
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M Fowler
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Re: Hot Rod Plexi 100w

Post by M Fowler »

IMG_1123.JPG
The amp is working well for me but I see it could use some solder joint touchup, I was sick and in a hurry when I was building it.
IMG_1112.JPG
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dorrisant
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Re: Hot Rod Plexi 100w

Post by dorrisant »

I think I see what's stopping it... There is a handbrake there in the top picture... It's probably engaged.
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lovetone
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Re: Hot Rod Plexi 100w

Post by lovetone »

It looks great to me..

Where do you buy those terminal posts, like the one you have near the can capacitor with the 10K connected?
sluckey
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Re: Hot Rod Plexi 100w

Post by sluckey »

Those threaded turrets are common in military, avionics, or industrial electronics equipment. You can find a variety at Mouser or eBay...

https://www.ebay.com/itm/Concord-Electr ... SwD8BZb5pO
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