Here is my schematic for a tube buffered gainclone. The tube buffer is configured as a plate follower with a gain just above unity. The chipamp circuit is the one provided with the standard kit from Peter Daniel. The input resistor is 220-ohm for the LM3875, but I was wondering if I need a resistor from Vin+ to ground of the chipamp? I have seen 22K used, but I'm not sure if that is what I need to use or not. Also I have seen that some suggest to use a grid leak resistor from the grid of the tube to ground. If it is needed what value would seem reasonable?
If anyone has any suggestions or comments about the circuit design it would be greatly appreciated. Thanks ahead of time.
If anyone has any suggestions or comments about the circuit design it would be greatly appreciated. Thanks ahead of time.
