On 6/6/2017 9:41 AM, Scott Dorsey wrote:
And on the other end of that scale, there was the Les Paul Recording Pickup
System with a 600 ohm balanced cable run between the instrument and the
amplifier. Nothing fancy about the pickup, it just had fewer turns and
the ground reference point was moved.
I always thought that's how it worked, but every (which I think is two
or three) wiring diagram I've seen for that guitar shows standard
pickups with conventional tone and volume controls, with transformer
between the pickup switch and the XLR jack on the guitar. The pickups
weren't low impedance, the transformer made the output low impedance and
balanced. The the guitar shipped with an XLR - transformer - 1/4" TS
plug at the amplifier end to make the guitar it work with a standard
amplifier.
Chet Atkins was reported to have made genuine low impedance pickups for
a few of his guitars so he could connect them directly to the mic
preamps of the day.
Could be that with all that haywire in the Les Paul Pro, guitarists who
used it through the input transformer and a standard amplifier weren't
happy with the sound.
There was a matching Les Paul Professional amplifier with an XLR input,
but I never saw a diagram of that one so I don't know if it was a
conventional tube amplifier with a step-up transformer at the input.
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