1066D Features
The 1066D is completely hand-wired using Carnhill (St. Ives) transformers and has the same mic-line pre-amp as the 1073, with the exception that the 1066D adds a few different frequencies to your pallet.
This unit is popular among guitarists for having a unique mid-range. The original 1066 only had a 10k shelving but this unit offers additional frequencies: 10k Hz,12k Hz,16k Hz, 20k Hz and 24k Hz.