Unfortunately the primary is shorted to the secondary in my transformer. Don't think that I can get a reliable measurement from the exiting windings.

I was chatting with Norman on ARF and he had some good advice:

No on the custom replacement or rewinding. The Philharmonic employs four 6L6 tubes in fixed bias push-pull parallel. The transformer primary impedance should be 2500- to 3300-ohms and secondary impedance should be 32-ohms which is completely satisfactory for 38-ohm voice coil. However, what is really required is a turns ratio of 8.8 to 10.2 (square root of impedance ratio). Hence an output transformer with a 16-ohm secondary impedance and 1250- to 1650-ohm primary will be equally satisfactory. The minimum power handling capacity of the transformer should be 50-watts.

I still have the original problem of trying to source a replacement, so I am still looking.

David C. Poland said:

Does the construction of a new Hammond transformer have room inside the laminations to add windings around transformer coil? Is what I did for a Scott Masterpiece speaker to match a new Hammond xmfr to speaker’s 38 ohm VC. If half your old output transformer is still good, you can measure the ratio of secondary to primary to get a decent approximation and add windings to the new Hammond 16 ohm secondary lugs for a 7th lug to further decrease the ratio. In my case, about 25 additional turns worked well on a 15 watt p-p output transformer. I posted a write up some years ago here on my effort.

An update: Phil at Heyboar is going to build me a transformer. Posting here so others have it as a reference.

3,300 primary, CT

32 secondary, with 16 ohm tap

10.1 winding ratio

50W

Standard M27 laminations (Phil didn't see a need for the more expensive "hi-fi" steel)

My cost was $140 + shipping. Will post an update when I get this installed an working.

Thats great. They came through for me on the power transformer. It did take about 3 months. I was able to pick it up in October on our way to Muskegon.