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Marshall 9004 Rackmount Preamp Negative Voltage Supply
Hi, I have a Marshall 9004 rackmount preamp here (schematic attached) which is not producing sound output, apparently on account of the negative voltage rail...
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The gremlin of studio EMI
Gentle readers,
I suspected my (20+ year old) Carver PM-300 was radiating some buzz/hum into the other components in the rack. It does hum audibly...
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The 5 Pound Bag (A Documented Build)
I recently finished an ambitious 3 year build which I've documented at:
The 5 Pound Bag
Its architecture is pretty unusual and...