HC-203U Single-Ended Output Transformer

The Hashimoto HC-203U is for applications that require 2.5K or 3.5K Ohms primary with up to 20 Watts output level into 4, 8, 16 Ohms.  The HC-203U is equipped with an Ultra-Linear tap for both 2.5K and 3.5k Ohms primary, and its frequency response covers between 30Hz and 60,000Hz (+-3db) - please click the right thumbnail to see the actual chart.  The HC-203U is called a universal type because it can be used under 2.5K or 3.5K Ohms of primary through separate B+ terminals.  Since the HC-203U has separate B+ terminals, it also has independent Ultra-Linear taps for each primary impedance.  The HC-203U is suitable for single-ended applications that utilize popular vacuum tubes, such as 300B, 2A3, KT-88, 6550, EL34 (6CA7), 6B4G, 6A3, and 6L6-GC.  The HC-203U is a brand new product that Hashimoto introduced at the 11th Tube Audio Fair in Tokyo on October 8, 2005.  The HC-203U is a cost down version of the Hashimoto's best seller, the H-20-3.5U.  The differences between these two models are; 1. The HC-203U does not have the protective outer shield that is filled with the special pitch to protect the core from the electro-magnetic interferences and noises.  2. Because of the less protection from the electro-magnetic interferences and noises, the core is designed a little more conservative way to satisfy narrower frequency response.  Otherwise, the HC-203U has the very similar sound characteristics to the famed H-20-3.5U.         

The HC-203U measures 90 (W) x 90 (D) x 83 (H) mm, and weighs 2.0Kg (4.4 LB).  The Primary Inductance can be chosen between 10H/100mA (2.5K Ohms) and 13H/80mA (3.5K Ohms).  The Maximum DC Current can be up to 130mA.

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Last changed: 02/01/15