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  1. G

    Studio Preamp Upgrade parts and iic+ mod

    Thanks for the reply. All the discussions I've seen online appear to referring to the same schematic I linked. Does anyone have information about the value of this resistor from a trustworthy source that is independent of this schematic?
  2. G

    New Mesa/Boogie Rack Product Ideas

    Except that the 2:100 uses diodes.
  3. G

    Studio Preamp Upgrade parts and iic+ mod

    I know this is an old thread, but I'm interested in potentially upgrading the lead circuit in the Studio Preamp to a IIC+. It seems the consensus is that the input resistor to V4A on the commonly available Mark IIC+ schematic is 170k, which is not a standard value. To me it looks like 470k...
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