“Spectra 1964” will sell 101’s for $200US new. The 101’s are built to the same spec as the originals.
Their products are all adaptations of the original Dilley designs, mostly based around the 110a as in the STX module, V610, M610 and the 611’s.
They offer a “Classic” 610 based off the original Dilley 610 with the 601/603/101 topology, but with out the Spectra Sonics name - features a reworked PCB layout, modern transformers and a compact external switching power supply.
The STX 100 is based on a 110ax card, which is Spectra 1964’s rework of the Dilley 110a - it’s essentially the same just smaller and not edge connector compatable.
It’s a cinemag input transformer, a single 110ax with an IC output stage and and IC quasi balanced output.
The V610, which is their flagship product, is based off Dilley’s 610 but employs the 110ax and has modified gain staging. Also features detented input and output pots, modern transformers and a compact external switching power supply.
Bill Cheney is friendly and approachable, and loves to talk about Spectra!
Hope this helps a bit.
Timothy