I don’t recall us making them exact statements. The Custom nickel transformers do in fact increase the output level by 6dB because they are and were designed as a 1:2 transformer instead of the original 1:1 transformer that are installed in the MK1. We did state that The Custom nickel transformers have a much lower output impedance than the MK2 Edcor XS4400 transformers which places the secondary windings in a series configuration in order to achieve a 1:2 output which creates a very high output impedance. This was kind of a cheat as the Edcor XS4400 was not designed to do so. The Custom nickel transformers are designed from the ground up specifically for each model, The MK1 or the Mk2.
The lower impedance is a plus as it in theory should have a lower noise floor going directly into a power amp. We never tested this as we recommend going through a pre-amp.