ALPHA 76A, 78, 374A Filament Autotransformer (AT) for 3CX800A7 conversion

Easy to install AT for use in the Legacy ALPHA 76A, 78 or 374A amplifier.  The AT uses the existing 6Vac @ 9A source and converts it to 13.6Vac @ 3A for driving the filaments for a pair of 3CX800A7 tubes.  Small enough to install inside amplifier on rear panel next to power transformer.  Three easy connections.