28-01-2019, 11:20 AM
Well, those two demonstrate what I said about different designs having different component values but neither is the right one! The one with the volume control configured as described by the OP has a 120Ω bias resistor and the other uses 100Ω!
Having the cartridge connected to the wiper of the volume control makes no sense to me as a crystal cartridge should be fed into a high impedance output to get a level response. The bass cut at low volume settings must make it sound dreadful!
I'd recommend rewiring it so that the cartridge always sees a 1M load with the wiper connected to the grid as in the MC 1961 design.
Having the cartridge connected to the wiper of the volume control makes no sense to me as a crystal cartridge should be fed into a high impedance output to get a level response. The bass cut at low volume settings must make it sound dreadful!
I'd recommend rewiring it so that the cartridge always sees a 1M load with the wiper connected to the grid as in the MC 1961 design.
