Hey-Hey!!!,
IMO the old power Iron is of far less import unless you are buying it for the potting cans. It is usually designed with lower primary voltage. Running 115 Iron on 120-125 is not ususlly a good idea in audio apps. 6.3 turns into 6.6 or worse, and similar things happen to the HV. not always bad, just so you realize what is going on in the design stages.
you had reservations about ME? well I never....:-)
regards,
Douglas
shameless plug: the ART shirts are really nice.