partial Sowter transformer list. Some info for the following (also custom made) models:
Sowter 2350, 3128, 3197, 3229, 3233, 3241, 3257, 3267, 3270, 3276, 3284, 3360, 3361, 3379, 3423, ,3497, 3528, 3557, 3586, 3603, 3612, 3622, 3672, 3740, 3769, 3819, 3829, 3902, 3919, 3991, 4069, 4079, 4057, 4076, 4057, 4076, 4118, 4119, 4126, 4169, 4219, 4220, 4231, 4242