PNP Mangler positive bias voltage?

[daverik]

So, I've got this Mangler together and when I set the bias using the test points on the board I get +4.5 v with the black lead from the DMM on the test pad and the red lead to ground.  Unless I am misunderstanding the process, (which is entirely possible), this should be negative 4.5 v, correct?  I am using the "Fuzz Face PNP, US" transistors from smallbear, and used their supplied resistors (with the exception of R-3 which I kept according the the Madbean schematic along with the 20k bias trimmer).  I'll take some voltage readings later today on the transistors and post them here, along with some photos.  I've checked the battery leads and they are correctly hooked-up (+ to ground, - to 9v-), hit all the solder joints again and checked the polarity of my caps, all OK.  Any thoughts before I upload some photos?  Thanks, Dave

[alanp]

The black lead is ground. You are reading -4.5V, it is just that your DMM leads are reversed.