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Old 8th April 2010, 01:52 AM   #1
diyAudio Member
Join Date: Jul 2006
Default Marshall valvestate 8004 copy

Ok so first of all i have some spare Tda1514 at home that i want to use.
I serched the web and found that Marshall used this in the Valvestate 8004.
So i downloaded the schematic and started by making a parts list but i have some problems.
I can't see the gain knobs on the diagram.
Could someone help me. i am missing something??

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Old 9th April 2010, 01:26 PM   #2
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Location: Cape Town
don't know the amp but it seems it didn't have a gain setting.

Easiest will be to just add a attenuator at the input.
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Old 9th April 2010, 01:34 PM   #3
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Location: Cape Town
Just change r19 and r7 to potentiometers.

Closest might be a 22k potentiometer.
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