Getting hard to find now - one pair of LM337K TO3 regulators, taken from a Naim XPS PSU so they're guaranteed to be genuine. Fully working too, of course! £15 including delivery for both parts.
I also have a damaged Naim XPS PCB - the discharge part of the circuit has self-immolated but the actual regulator section seems fine. Regulator section resistors and tants are still in place (no big caps but they were well old anyway and needed replacing), and I have the three heatsink brackets too. Could easily be cut up to make three separate dual-reg modules. Add an extra £5 for the PCB and the three brackets.
I also have a damaged Naim XPS PCB - the discharge part of the circuit has self-immolated but the actual regulator section seems fine. Regulator section resistors and tants are still in place (no big caps but they were well old anyway and needed replacing), and I have the three heatsink brackets too. Could easily be cut up to make three separate dual-reg modules. Add an extra £5 for the PCB and the three brackets.