SST108 // Triad 108 spec 5E3 Deluxe Output Transformer

A hand made recreation of a unique transformer for late 50's 6V6 Tweed amplifier builds

**Wound to order - ships within two weeks from order date**

SST108 Description:

The original Triad 108 output transformer was standard fitment on several different amplifiers in Fender's catalog during the late 1950s.  This includes the Harvard (some of them), Tremolux, Vibrolux, and of course the Deluxe amps ranging from around 1956 till sometime during 1959.  It's an odd design for Leo Fender to pull out of a catalog for a push-pull amplifier at the time - a decision most likely due to Triad's ability to produce them in great numbers and the low cost offered to OEM manufacturers back in the day.  

What's unique in it's design is what makes it unique in it's sound.  First unlike any other transformer Fender had used on their Deluxe amplifiers previously, it's wound on a plastic bobbin with a random wound primary.  This technique reduces leakage inductance in the primary opening up the top end more from the earlier layer wound Triad 1839 used on the Deluxe amplifier at the cost of higher layer capacitance (wire on wire).  Secondly, it's laminated with a shimmed butt stack in the core - a technique normally reserved for single-ended operation.  This has the effect of reducing primary inductance at larger signal swings which in turn will reduce the low frequency content when the amp is cranked up loud.  Wound for the discerning amplifier builder.

Leads are terminated with Teflon insulated wire for abrasion resistance and longevity.  I've opted to terminate what would have originally been a "self lead" on the secondary common to a wire lead to prevent any chance of a floating ground occurring.   

As with all of my transformers, electrical grade kraft paper is used for all layer and winding insulation.  All tape used is paper based thermoset tape - just like in the old days.


8K : 8R Impedance ratio

Suitable for 15W-18W output power

26ga non-oriented steel core material

Original Triad winding structure