![[-]](https://theultimatetone.com/images/collapse.png "[-]")
02-17-2025, 01:02 PM
Hi Guys
The 2M2 is a safety resistor to guarantee a connection between the bias supply and the tube grid in case of pot wiper discontinuity. Of couarse, if the the pot track is simply wired in parallel with the 2M2 and wiper linked to the top end, then the 2M2 is redundant.
As Physics (and physics) points out, dialing the pot to zero will tie the coupling cap to the bias supply and load the splitter while reducing the drive into the tubes to zero. This overall effect is the same as with the crossline MV inasmuch as drive to the tubes is reduced while the loading on the splitter is increased. In both cases the differential gain of the common Schmitt splitter is reduced and its distortion may rise. When feedback is applied to the power amp, as is the case with high-power amps, it can be difficult to retain a clean sound when the MV is reduced.
The 2M2 is a safety resistor to guarantee a connection between the bias supply and the tube grid in case of pot wiper discontinuity. Of couarse, if the the pot track is simply wired in parallel with the 2M2 and wiper linked to the top end, then the 2M2 is redundant.
As Physics (and physics) points out, dialing the pot to zero will tie the coupling cap to the bias supply and load the splitter while reducing the drive into the tubes to zero. This overall effect is the same as with the crossline MV inasmuch as drive to the tubes is reduced while the loading on the splitter is increased. In both cases the differential gain of the common Schmitt splitter is reduced and its distortion may rise. When feedback is applied to the power amp, as is the case with high-power amps, it can be difficult to retain a clean sound when the MV is reduced.
