I have a pair of these that are used and I’m unlikely to ever build a 300B PSE now as I've gone down the path of big power hungry speakers. I’ve had them sat in a cupboard for 8 years since being bought used!
I don’t post much on hi-fi forums recently but have been a member here for years.
Datasheet here: - SE12 SINGLE ENDED OUTPUT TRANSFORMER 8
They’re BIG! Pint Glass for scale in pic. And Jolly heavy at 6.2KG each. I’m not sure about posting them TBH.
Current RRP is £737 delivered.
I’d like £350 + delivery or collection from UK surrey/hampshire border.
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE6.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE5.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE4-rotated.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE3-rotated.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE2-rotated.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE1-rotated.jpg
I don’t post much on hi-fi forums recently but have been a member here for years.
Datasheet here: - SE12 SINGLE ENDED OUTPUT TRANSFORMER 8
They’re BIG! Pint Glass for scale in pic. And Jolly heavy at 6.2KG each. I’m not sure about posting them TBH.
Current RRP is £737 delivered.
I’d like £350 + delivery or collection from UK surrey/hampshire border.

http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE6.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE5.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE4-rotated.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE3-rotated.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE2-rotated.jpg
http://www.gt400.co.uk/wp-content/uploads/2021/04/Sowter-SE12S-300b-PSE1-rotated.jpg
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