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Old 5th January 2015, 03:20 AM   #1
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Default Another Layout Proof Request - Marshall JCM800

Hey all,

I want to thank again everyone that helped me proof the Sunn Model T layout a few months ago, I plan on starting that build in the very near future. In the mean time, I wanted to draw up a layout for a Marshall JCM800. I know that there are plenty of layouts available already for these, but I wanted to draw a new one up to help me practice reading schematics a little more.

here is the layout:
http://www.davidbradberry.com/images/jcm800.jpg

here are the schematics I referenced:
OUTPUT/POWER SUPPLY

PREAMP

and because those were pretty hard to read, I also used this to get some values, disregarding the power supply and bias supply:
https://taweber.powweb.com/store/8cm100_schem.jpg


thanks in advance everyone!
-david
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Old 24th January 2015, 03:33 AM   #2
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found a couple better schematics to help cross reference with the layout I drew up.

http://www.drtube.com/schematics/marshall/2203pwrm.gif
http://www.drtube.com/schematics/marshall/2204prem.gif

these might be a little different then the ones I initially was making the layout off of though. I need to update the resistors on the line out on my layout I see.

If I could get someone to put an eye on this I will be very thankful.

http://www.davidbradberry.com/images/jcm800.jpg

-david
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Old 25th January 2015, 06:19 AM   #3
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I have found these:

http://www.google.com/url?sa=t&rct=j...,d.d24&cad=rja

JCM800 2204
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Old 25th January 2015, 01:27 PM   #4
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thanks kacernator,

there are a lot of JCM800 layouts already on the internet. However, the main reason I wanted to do my own layout is to help me practice reading schematics.

I have been a "paint by numbers" amp/pedal builder for a few years now and want to step up my game a bit.

thanks
-david
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Old 19th March 2015, 02:51 AM   #5
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I am thinking about ordering parts soon for this build. If someone could put an eye on this it would be appreciated.

Thanks,
David
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Old 20th March 2015, 02:50 PM   #6
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It appears to look good. You do want to keep the Preamp tubes AWAY from any of the iron. Take a look at the actual Marshall layouts. Also, tubes stay in the back to help with cooling, transformers can be in the front of the amp.
Daniel
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