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RE: BDT Preamp Schematics

Posted by johs on May 13, 2008 at 13:18:39:
A long awaited schematic John, thank you! Have collected parts and planned for a BDT preamp with a Gary Pimm phono and was about to start building when the good news came. There are some questions I would like to put forward; Is the BDT tube aspesially sensitive to magnetic fields or would any or most tubes benefit from the same treatment you have given the BDT's? As for the aluminum chassis, will it have to be without ventilation? I am trying to understand the CCS/voltage regulator and the CCS for the cascodes. Gary's CCS's all have a current limiting resistor, R1. I can't find this resistor in your circruits, does this mean that there is no or a different current limitation? What is the purpose of R13, to set a maximum current? What is the maximum amplification with the cascodes?

Johannes