Adam Monroe's Wurlitzer virtual instrument plugin was sampled from an "early model" 1970's Wurlitzer 200A electronic piano. The process began by close-miking the piano with Beyerdynamic MC930 condenser microphones on the Wurlitzer's built-in speakers, and an AEA R84 Ribbon Mic on the line-out signal through a Fender Deluxe Reverb Amp. These signals were fed into Grace M101 and AEA TRP Preamps respectively.
The wurlitzer's amplifier and preamp were re-capped in an attempt to save the amplifier, but about half way through the sampling process the amplifier died, which eventually killed the power transformer. The preamp, amp, and power transformer were all replaced and sampling continued. Well sampling the bass notes, it became apparent that the Wurlitzer's built in speakers also needed to be replaced.
Most keys on the Wurlitzer were mostly in tune, but a few keys needed fine adjustment, and F2 needed to be replaced completely, as our attempt to "add solder" to the lead tine, in order to lower the pitch, failed completely. The Wurlitzer samples were processed with EQ in order to cut a lot of the low frequencies out, in order to better sit in a mix as a more midrange instrument, as the bass frequencies were heavily dominant.
This was the most temperamental instrument we have sampled thus far. This is to be somewhat expected, as a Wurlitzer 200A contains numerous electronic components from the 1970's that were not designed to last 40+years, such as electrolytic capacitors. Compared to the passive design of a Rhodes piano, there's simply a lot that can go wrong, which is why we recommend purchasing a Wurlitzer sample library!
Please check out Adam Monroe's Tremolo, a free companion-piece plugin to this sample library, as well as Adam Monroe's Mark 73, for a slightly different electronic piano tone.