Den fredag 27 september 2019 kl. 19:48:15 UTC+2 skrev Bo-Lennart:
Hi all out there.
I found a transformer in my basement. I don't know if its a audio-output transformer or just a power transformer.
On top it's stamped "GALVIN MANUFACTURING CORPORATION",
and a model #: "25B31296-E" and a serial# ( ???? ) "138226"
At bottom there is 8 solder lugs, stamped: "1 to 8".
And at one side is 8 screw connector, labeled as "3A 12 11 2B 2A 10 1A 9".

To me it looks more like a tube output transformator, more than a power transformer.
It seems to be from the 1940 or somewhere around there.

Anyone know what it is, and have some kind of "schematic" of the transformer.

Many thanks in advance

Bo-Lennart Karlsson
Falun, SWEDEN

I have uploaded som picture of the trafo. And I made a schematic of the
transformer.
Here is the links:

https://i.ibb.co/Jx3RtLR/20190929-155553.jpg
https://i.ibb.co/mh0k6rB/20190929-155912.jpg
https://i.ibb.co/z4PV2JZ/20191001-164147-001.jpg
https://i.ibb.co/QYVPqwR/20191001-164228.jpg
https://i.ibb.co/NKDynrF/20191001-164522.jpg
https://i.ibb.co/0Qq2xf0/20191001-164553.jpg
https://i.ibb.co/c2Rtcqw/20191001-164606.jpg

Well, I'm an old man (turned 70 early this yr), and I started my electronic profession very young. At that time the car radio had VIBRATOR to make 12V (or 6V) transformable.
And I start to think that it's a such transformer.
The screw-terminal could be switchable betveen 12 and 6 Volts use ?????.
How about that? Anyone have a better suggestions?

Best regards
Bo-Lennart Karlsson
Falun, SWEDEN