Brass bobbin -- what do you all think?

[soundmasterg]

The only way to shield magnetic effects that I know of is with Mu-metal, which is really expensive. You can't get there with just copper...

Greg

[jack briggs]

Yeah, I just learned from an amp tech that the copper pads on PT's is for heat dissipation.

But we know that copper shields RF - that's why it's used in guitar cavities.

[soundmasterg]

Yeah, copper will shield against RF if done right, but it doesn't have any effect on magnetic fields as far as shielding, which is what I was pointing out.

Greg

[jack briggs]

Greg,

Rodger, dodger.

[Zhangliqun]

Stainless steel covers, eh? Hmmm...interesting idea...

[gregyancey]

When charging alnico with the Stew Mac instructions and neo magnets it's important to use a metal vice to complete the magnetic circuit. You'll get better results than just suspending the two magnets in free space via wood or whatever.