Amorphous C-type iron core 2.5K single-ended output transformer, suitable for 2A3 6Y6 tubes, 15Hz--27KHz -3db, 20--20KHz -1.8db Amorphous C-type iron core 2.5K single-ended output transformer, suitable for 2A3 6Y6 tubes, 15Hz--27KHz -3db, 20--20KHz -1.8db. Sale price : $46.89 Category : Home Improvement