So! My dad and I are setting out to build the ultimate Bluesbreaker. We've scrimped and scratched and saved to do it the right way! Nik has been absolutely gracious with his time, advice, and question answering. I realize, though, that time spent answering my questions is time spent NOT doing important things.

My first question regards the PPIMV. I plan on installing one, but am unclear about how to the shielded cabling in order to reduce noise. Here is the diagram I'll be working off of.



Which conductors of how many shielded wires do I connect to where?! Here's what I think I'm s'posed to do:


2, 2-conductor shielded wires.

Wire 1
Center conductors from pin 1 of each half of the pot to the circuit board
Shield clipped on the circuit board side, but connected to either pin 1 of either half of the dual MV pot. Or the back of the pot.

Wire 2
Center conductors from pin 2 of each half of the pot to the grids of the power tubes
Shield clipped on the tube socket side, but connected to pin 1 of either half of the dual MV pot.

This right? Seems right to my mind.

Thanks! Yeah -- I've come across a thousand links to the Metro forum during my study for this build -- its a drag that it's down!

So! Let me be sure I've got this right! You recommend a 4-wire approach in order to cut down on noise -- something in which I'm abundantly interested! Like this?

4, 1-conductor shielded wires.

Wire 1
Center conductor from pin 1 of the front half of the pot to the circuit board
Shield clipped on the circuit board side, but connected to pin 3 of either half of the dual MV pot.

Wire 2
Center conductor from pin 1 of the rear half of the pot to the circuit board
Shield clipped on the circuit board side, but connected to pin 3 of either half of the dual MV pot.

Wire 3
Center conductor from pin 2 of the front half of the pot to the grids of V5. Shield clipped on the tube socket side, but connected to pin 3 of either half of the dual MV pot.

Wire 4
Center conductor from pin 2 of the rear half of the pot to the grids of V5. Shield clipped on the tube socket side, but connected to pin 3 of either half of the dual MV pot.

That look right?

Apart from tightly twisting the heater wires, any advice for taming the potential noise on this thing? I already intend on wiring the inputs with shielded wire a la the Tube Depot JTM45+ layout. (68k resistors taken off the board and connected directly to the input jacks, shielded wire used to connect inputs to V1).

Thanks again for your help!

---
Cam