AmpsandSound Agartha Headphone Amplifier

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AmpsandSound Agartha Headphone Amplifier

by AmpsandSound

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$3,600.00
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Product Code:
AMSO-AGARTHA
Label/Make:
AmpsandSound
Genre/Model:
Agartha
Description:
Headphone Amplifier

Have a question about this product? Please email our audio advisor or call 1-877-929-8729 with any questions or concerns regarding your equipment purchase.

AmpsandSound Products Are Handmade In Small Batches and Go Through Extensive Quality Control

The name Agartha used to describe a city in the center of the world. The ampsandsound Agartha brings the legendary 300b to personal audio. They chose the 300b for its long history as the king of triodes. Combining a single gain stage, zero feedback and careful attention to grounding techniques they are able to use a 300b with headphones without hum or noise. For those with headphone, horns or single driver speakers who are seeking audio nirvana, the Agartha is built with exacting attention to parts selection and implementation.

The Agartha tube amp pairs a 6SL7 tube for front end with SS rectification enabling great transient peeks, faster/livelier presentation and ultra-quite operation. The Agartha uses direct-heated triodes with zero feedback providing the classic single-ended sound so widely loved.

Typical of all ampsandsound amplifiers, the power supply is massive. This combined with a generous choke yields our trademark low noise; less than 3mv at idle, and stable output of 5 watts RMS into an 8ohm load and 1watt into a 32ohm headphone. Frequency response is 12hz to 30hz at 1 watts, 1-db. Output iron has been carefully selected to reduce distortion and increase frequency response. And of course we also use our 5% capacitors and 2% resistors.

The motivation of the Agartha is to provide access to the wide availability of NOS tubes and give the warm mid-range bloom that is at the heart of single-ended direct-heated triode designs. Tube set included.

From AmpsandSound:

Non-boutique approach
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.

Minimal Deflection
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.

Wiring Detail
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.

Handmade Products
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.

Easily Upgradeable
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.

Semi-Custom Design
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
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!

Features:
Custom wound ultra-high quality US sourced transformers
32 - 300 ohm ¼” output jack
1.5 watts/channel for headphones
5 watts/channel for high-sensitivity loudspeakers
Utilizes 300B triode output tubes
8-ohm speaker output with five-way binding posts
ALPS volume pot
Choke filtered power supply
Custom walnut chassis with ebony corners and hand rubbed finish
Triode strapped output
Easy to drive input
Specifications:
Input Sensitivity: 840mV RMS for full power
Max Power: 5watts RMS into 8ohms
Max Power: 1.5watts RMS into 32ohms
Noise: 760 uV as measured from 8ohm Tapp
Noise: 660 uV as measured from 32ohm Tapp
Power Bandwidth 20hz @ -.5db down to 20Khz @ -2db down as measured from 8ohm Speaker Tapp measured at 1 Watt RMS
Power Bandwidth 20hz @ -.5db down to 20Khz @ -4db down as measured from 32ohm Headphone Tapp measured at 200mWat RMS

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