AmpsandSound Stereo 15 SE Amplifier
- Product Code:
- Stereo 15 SE
- Stereo Amplifier
- More Info
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AmpsandSound Products Are Handmade In Small Batches and Go Through Extensive Quality Control
The Stereo 15 Special Edition is an EL84 ultra linear amp with 15watts 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 15watts 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.
ampsandsound believes in the non-boutique approach to manufacturing. Resistors are 2% or better and over spec’d, Caps are made by industry leaders with 5% or better ratings, wiring is Teflon, and output transformers include large core to resist saturation and provide a minimum 20hz to 20khz on a bench. Ultra wide frequency response, rock steady RMS provides a non-fatiguing sound.
All ampsandsound amplifiers are built on a thick plate of anodized aluminum which is 10”x14” and placed into a hard wood plinth/chassis made of solid ¾” thick Eastern Walnut. The plate is 1/8” thick and has nearly no deflection. We don’t outsource our work at ampsandsound. We have the depth of the chassis large enough to allow for full sized chokes to be used without cluttering the clean look up top.
Ample Power Supply
All ampsandsound amps employ an extremely stiff power supply. The power supply chosen exceeds specified capacitance and always includes robust choke filtering. We recognize the importance of reducing DC ripple in creating life-like sound stages.
High Quality Transformers
Output transformers are over spec’d and ultra high quality. We consider the output transformer as important as any other design choice. When buying any tube amp, the weight of output transformer can be directly proportional to the quality of sound. In general, larger outputs have larger cores which are less prone to saturation and have higher inductance. Larger cores and greater inductance allows the transformer to carry a low-end signal with minimal distortion. These transformers are bench tested to perform down to 20hz to up to 20khz. Even if your speakers only go to 50hz like a LS3/5a having an amp with can drive that low impedance signal is pivotal in creating the whole sound stage.
Internal wiring is done with silver plated Teflon and silver solder. All wiring is held down and tied neatly with obsessive detail. We prefer never to see a loose wire… always tied down with a service loop and always dressed with function dictating form.
Our products are handmade. Parts selection matters deeply to us, sourcing the highest quality parts that can be found without getting distracted by esoteric or misleading specs. We have chosen parts with preference to domestic suppliers including our signature top plates, chassis, transformers, and PCBs.
Quality, not Quantity
We do not want to sell these in large quantity. We seek to build something worth passing down and demanding use. We believe each of our amps are statement pieces, each design choice was made with care. Our design esthetic was masculine and purposeful… nothing by accident.
We have specifically chosen to build based on the best practices of production. Switches, fuses, IEC sockets and binding posts are common and replaceable with off the shelf parts should a need ever arise. Tube Sockets are high temp ceramic, PCB is super thick with through hole construction, resistors, and capacitors are all over spec’d intended with long trouble free use.
Dramatically Smooth Sound
The sound is smooth, liquid without sacrificing detail. We recently demonstrated the final production version at a small listening party paired with our Cornscalas’ and everyone was awestruck with the size and depth of the sound-stage.
The Aluminum top-plates and hardwood chassis were made large enough to allow appropriate component layout with specific attention to grounding and signal wire location. We chose to use domestic hardwoods, Eastern walnut, Mahogany, and other exotics to provide the solid foundation to build excellent sound. Exotic hardwoods can be chosen at additional costs.
Special Attention to Grounding
Each amspandsound amp is built with attention to grounding schemes/ star grounding and use of common ground contributing to its ultra-low noise floor and wide bandwidth.
Tube Rolling is a great way of getting to know your amp as each tube has its own sonic signature. The reality is we are here to enjoy music… if rolling, try 1 type at a time… driver or power and allow several weeks to really hear the tube before changing it again. So often we chase a different sound, rather than a better sound. A great amp or speakers are meant to be transformative, so let the music play!
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)
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