Stereo 15 Special Edition

Input Transformer

The Stereo 15 Special Edition is an EL84 ultra linear amp with 15 watts of tube bliss. 2 EL84 tubes in push-pull configuration with ½ of a 12AX7 and ½ of a 12BH7 per channel, just like our original Stereo 15. The Stereo 15 Special Edition is based on the famous Halfer circuit with cathode bias allowing trouble free operation. 8ohm and 4ohm taps with 8ohm and 16ohm combination as an option. The circuit used is widely famed for its stability and liquid midrange.

The Stereo 15 Special Edition produces perfectly stable 15 watts RMS with 42watt peaks. The output transformers utilize massive cores which resist saturation and deliver jaw dropping low end performance. Like all ampsandsound amplifiers, it is dead quiet with reliable performance. When we say dead… we mean put your ear to the mouth of your horn-loaded system and all you will hear is silence!

Never leaving well enough alone, the Special Edition is for those who demand the very last degree of performance. Where the Stereo 15 Special Edition differs is in the use of custom wound transformers made exclusively for ampsandsound. The power transformer is nearly twice as heavy as the unit used in the Stereo 15 and allows for greater current delivery/reserves and the use of a tube rectifier. We have specified the use of a GZ34, and can accommodate GZ37s; 5U4s allows NOS rectifiers. Tube set included.

Bench results:
Input impedance is 500Kohm, 1.6v for full power.
With inputs shorted output noise is 5mV P-P
Maximum Power @ 1kHz = 22 Watts RMS
246mV P-P = 1 W RMS 10 Hz (-0db) – 27.4 kHz (-1db)
550mV P-P = 5 W RMS 18 Hz (-1db) – 22 kHz (-1db)
796mV P-P = 10 W RMS 26 Hz (-0db) – 15.5 kHz (-1db) (Before Distortion)