These are the 15W very wideband output transformers. Maybe made by Tamura but these are a sweet pair of outputs. primary is 10K, 8K, 5K secondaries are 4,8 and 16 ohms. Great for 2A3, 45, 71A 6BQ5, 6V6, EL34 etc. They do have some dings and even a crack or two but the performance is GREAT!!!