Drip Electronics(.com) offer extremly high-quality PCBs to build vintage recording gear. One of their latest releases, for the 47 version 2 states:
"Drip even included the option to use a GZ34 tube rectifier. The use of vacuum tube regulators and rectifier gives the unit it's beautiful 'sag' when pushed hard, ideal for cutting edge vocals and shredding guitar."
And their Fairchild true clone states:
"Since the foundation of the Fairchild design is the power supply,great care has been taken to preserve its integrity. A tube regulated 240v and a high voltage 440v supply line give the 660a deep punch to your audio signal. Sprague atoms have been added for additional performance and filtering. This PCB provides the options to build a dream machine - all resistor footprints can accommodate up to five-watt metal film resistors. The capacitor footprints can also accommodate high end audiophile components such as Mundorf or Jensen."