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Hm, I was playing with options to get rid the 3dB divider in the MF channel input and I realized that I was a moron somewhere. I was operating under presumption that I was getting 2V on the driver cathode in MF channel that made the swing voltage on the grid valuable to drive the input tube into gird current. This is where the idea of the input voltage divider comes from. I person who observe my project informed me a couple day back that it might not be 2V.

I just measured it on this second amp and it is 3.25V. That is VERY BIG difference as my signal at full volume does not go over 2.2V behind the filter and 20K resistor.  So, bye-bye the input divider on MF. I have no idea why O flipped with the cathode voltage measurement. Perhaps what I did it I had a current-dead driver. Not I have 332R resistor and 3.25V. That make on the tube 10.8mA, which is right where, is shall be. Now, I need to figure out where my out stage will be clipping with more voltage from driver…

The Cat

Rerurn to Romy the Cat's Site