What are the differences in construction between the vintage soapbar, hot soapbar and custom soapbar? Are they the same winding with different magnets, or are they actually wound differently?
A Lil' of both . The SP-90-3 use's ceramic mags and is wound hot. The vintage use's Alnico mags. If you check the tone chart on the main site. they break it down pretty good.
I stuffed some alnico mags in a P90 Hot (SP2?) that I inherited and they sounded pretty dark...OK for a very bright guitar, otherwise pretty sludgy. They are now residing in a box somewhere...