This is a semi-lengthy inquiry. Bear with me. I recently modified my BOZ by taking out the stepped attenuator at the input in parallel with R107 (100k load resistor) and putting a 5 k dual pot on the output, as is recommended in the original article. The BOZ was working fine before the change, i just wanted to try it as designed by Mr. Pass. I checked the bias before putting it in the rack: 40 ma. per channel. I now have distortion when using both CD and tuner as inputs. After checking the usual suspects, I began to suspect that the input was being overloaded. Putting a 5:1 step down transformer temporarily between the CD player and BOZ, and then between the tuner and the BOZ eliminated the distortion that I was hearing. So I tried a voltage divider consisting of a 100k series resistor before R107 (also 100k). Still distorts. So... Anybody else notice this with their BOZ? Does this sound like the BOZ is getting too high an input signal? Is there a way to increase the overload resistance of the BOZ? (other than going back to an input attenuator) All answers and general musings appreciated.
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