[John L Stewart]

probably - it's something I'd want to do [again].

looking for output transformers, ran across THIS one.

https://www.amplifiedparts.com/products/P-T125A

it's a 3W somewhat-universal output transformer [push pull] with a
complicated secondary winding that lets you configure the primary Z,
apparently.

My guess is that it would make an interesting TRIODE OUTPUT STAGE using
the 12BH7 and this transformer.

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Look at the price, you will change your mind. The Hammond 125 PP Series is no longer a good choice for low cost audio. A while ago I had a look at the 125D pricing. From the 1960 catalogue to the present the price increased by 5.3% per annum. Wish I could get that kind of return over 55 years!

Over time I used many of the Hammond 125 Series in various projects. The performance was always more than passable. Anyone who has read my articles in AudioXpress & Glass Audio will see quite a few of them.

I knew several of the guys at Hammond over a period of 55+ years, both as a supplier & then as a customer while at HP & R&S.

Cheers, John L Stewart

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bass response isn't ideal, perhaps, but it might work well as a small
P.A. or "distortion" guitar amp where you want to create a really nice
overdrive sound, but at a relatively low output power...[/quote]