On Tuesday, February 2, 2016 at 7:37:13 AM UTC-5, John L Stewart wrote:
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...
--
John L Stewart
Apart from all that, there is not an audio speaker in my inventory that would survive on 3W unless it were played in a closet. I KNOW that BBB postulated an instrument application, but I pretty much focus either on audio applications, or vintage radio applications - and for the latter, such as my Hallicrafters with 6V6 outputs in PP, this may be a good application.
But, from the Maggies to the Piccolos, my audio speakers are power-pigs of the first order.
Peter Wieck
Melrose Park, PA
AR 3a
AR 4x
AR M5
AR Athena
AR TSW 110
AR 14
Magnepan MGIIIa
Revox Piccolo