Re: P-90 question?


"Tony Done" <tonydone@xxxxxxxxxxx> wrote in message
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"Jim" <askme@xxxxxxxxxxxxxxxxx> wrote in message
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Tony Done wrote:

"Pt" <peatea@xxxxxxxxx> wrote in message
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Pt wrote:

Jim wrote:

Pt wrote:


Or any single coil pickup for that matter.

Most guitars these days that have 2 or more single coil pickups have
one that is reverse wound to cancel hum.
I am totally against this because when using two pickups you will be
using them as a humbucker.
If I wanted a guitar with humbuckers I would have bought one.
So here's my question.

Can I reverse the wires on the reverse wound pickup to put it back
in
a
normal non-hum calcelling mode?

Pt


No. If you just reverse the wires, you will be out of phase
electrically when using center switch position. You will get a LOW
output THIN and hollow tone (which has its own uses, but is DIFFERENT
from standard center position!).

Since the pickup is already out of phase (hum-cancelling) I would
think
that it would be in phase electrically if I changed it but out of
phase
magnetically.

I'm getting confused.

Pt


I should add something.
The pickup is reverse wound and reverse phase.

Pt



"RPRW" means "reverse polarity, reverse wound", not "reverse phase,
reverse wound". Ie it refers to the magnetic polarity.

Tony D




I've found that when a guitarist says "phase," 9 times out of ten it
ain't
phase at all.

When I was learning, we'd all put our Strat's "out of phase" by
carefully
putting the switch between positions (for you youngsters out there, this
predated 5 way switches). But it had NOTHING to do with phase of the
pickups.

I interpret out of phase to mean that one pickup is generating the peak
(eg
positive)of an electromagnetic wave while another is generating a trough
(eg
negative), so they tend to cancel each other out. The cancelling isn't
complete, as you can get in sound processors, because the string isn't
vibrating the exactly same direction and amplitude at both pickups. This
can happen when the magnetic poles both face the same way (eg North up)
and
the coils are wired in opposite directions eg live to clockwise and live
to
anticlockwise, or when the magnets face opposite directions, and the
pickups
are wired the same way, eg both live to clockwise. (I know you know this,
others may not.)

What I don't understand is why makers apparently reverse wind some pickups
instead of just reverse wiring them. Any ideas? I've done phase changing
quite a few times just by reversing the magnets (don't try this on a fibre
plate style pickup) and reversing the live and ground connections. It
seems
to work fine.

Tony D



Very interesting. I'd never thought about the polarity of the poles.


.

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  • Re: P-90 question?
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