Multi section winding for exceptional bandwidth and phase shift

FEATURES Our power output transformers use the best grade (M6) low-loss grain oriented silicon iron laminations. This ensures minimal distortion and low insertion loss. We wind our push-pull output transformers on two chamber bobbins which ensures full capacity and resistance balance. All larger types use 14 interleaved primary / secondary sections for the best possible coupling factor and hence excellent high frequency response. The smaller types, where the leakage inductance is lower use 7 sections in a single chamber.

OPTIONS We normally provide a single 8 ohm secondary or 4 separate secondary windings which can be arranged for loads of 16, 8, 4 or 1 ohms as shown in the tables below. Alternatively we can provide a single 4, or 16 ohms or 8 tapped at 4 ohms. Also we can provide twin 4 ohm windings which can be connected in series for 16 ohms or in parallel for 4 ohms. Tapped secondary windings will have somewhat increased losses, reduced HF response and reduced damping when the load is connected to a tap.  This is particularly true when a 4 ohm tap on a 16 ohm winding is used.  Please be sure to specify your preferred option if you wish to have a non-standard secondary option or a screen tap %.

CUSTOM DESIGN Please let us know your proposed valve type and circuit configuration and we will design a transformer for you. We also make replacements for classic amplifiers and circuits. If we do not list the type you need we will design it. The price normally depends on the size. Please see  price/size info. There is no extra charge for design.