20 January 2021
We have just recently announced the 'X' upgrade to existing PH 9.0 phono stages. The PH 9.0X is also sold new with these upgrades. Details below:
Call or contact your dealer for pricing.
What the PH 9.0X upgrade includes:
The upgrade to the PH 9.0X involves the addition of a pair of Lundahl gapped output transformers, commonly used in SET tube amps. The addition of these transformers also means the elimination of a pair of chokes and coupling caps, all in the signal path.
Why this upgrade?:
The circuit change made to the PH 9.0X, make it much closer to the PH 150 in terms of overall circuit design. Various other circuit differences in the PH 9.0 vs. the PH 150 were implemented, to see where the PH 9.0 could be improved. Most either made no difference, or for whatever reason, did not sound as good in the PH 9.0. This circuit change however DOES make a difference. The use of the Lundahl output transformers was one of the cost cutting design changes made to the PH 150 to achieve the PH 9.0. I found that the improvements were simply big enough that it warranted offering the upgrade, as an add cost option for the PH 9.0.
The sonic benefits of this circuit change are obvious and significant! There is better bottom end, more weight and authority to the sound as well as improved resolution, detail and soundstage.
Eliminating the coupling caps simply cleans up the signal because no coupling cap sounds better than the best coupling cap. This can be done, because the output transformers can absorb the DC voltage present at the outputs that the coupling caps otherwise block. The chokes are replaced also, as the primary winding of the output transformer serves the same purpose, but does so with a much higher inductance, translating to better bass and performance.