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Old 24th April 2006, 01:44 PM   #1
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Join Date: Jul 2004
Location: Austin, TX
Default need help for Marshall PCB

hi all
i just converted this marshall schematic ( power amp section only ) into pcb lay out :
http://www.drtube.com/schematics/marshall/1986mk2jp.gif
i convert it manually on paper , and then draw it with diptrace , i checked it out so much , but it s so easy to make a mistake and dont see it as u know , does any body see any errors on it ?
thanks
at sure i ll make it much compact but just wanna check it out this first version of it , then try to change it ,
( i removed the 47k resistor from 16ohms output of transformer cuz my transformer doesn t have the 16 ohm out put )
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File Type: jpg marshall mk2 bass amp pcb v1.jpg (92.0 KB, 117 views)
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Old 24th April 2006, 03:02 PM   #2
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Hi,
I found one: just in the middle you placed a 470K resistor... in the schematic this one is 470 Ohms.. I assume you place the components of the first tubes on a different board??
Kees
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Old 24th April 2006, 08:19 PM   #3
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thnx , i ll build an ampeg v3 pre amp instead of this marshal
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