Aragon 4004 MkII (baby Krell) – Great Condition

I am the original owner of an Aragon 4004 Mark II power amplifier Serial Number 051108. The unit was designed by Dan D’Agostino of Krell fame and manufactured by Mondial Designs in Connecticut. The Mk II update included an automatic bias control to maintain constant bias regardless of line voltage and its power supply is the largest which can comfortable operate from a standard 15-amp, 120 V household AC line.

Inside the Aragon’s case there are two totally separated mono amplifiers. The power supply and the large toroidal transformer are also double and can produce high current doubling power output as impedance load halves (goes from 200 watts into 8 ohms to 400 watts into 4 ohms thus the 4004 designation).

The unit was refurbished in late November 2011 by “In House Service Company” (StereoRepair.net) in Long Island, NY: repaired power supply board, tightened main filter mounting screws, tightened output transistor mounting screws and rebaised output stages. The unit has always produced great sound through my PBS Stratus Gold loudspeakers, but lately a low level buzzed appeared on the right channel. The refurbishment eliminated the buzz and now the amplifier is as quiet as it was when it was new. Later I also replaced one of the speaker binding posts. Everything works well. For a long time I left the amp's cover on without screws and now there are two screws missing out of eleven, but this affects nothing (just mentioning it to be transparent about everything).

In terms of the sound, the bass is punchy and provides good low-end control. Midrange sound is very natural. High-octave definition is precise. I recently purchased a Krell KSA-300s – a Class A 185-lbs beast – and the Aragon more than holds its own against its big distant sibling. I cannot tell much difference between the two amps in my system. I’ve gotten good results with an Audio Research LS3 preamp, a solid state design. Reason for the sell is that I’ve upgraded my speakers and I wanted to try new electronics with them.
Cosmetically the unit is in great shape and there are no visible scratches on the face plate or the case (see pictures). The power light indicator works.

Along with the amplifier I will also include the invoice from In House Service Company detailing refurbishment work performed, a thick AWG 14 power cable, glossy paper Stereophile review reprint from Vol. 15 No. 9, original owner’s manual, and other Aragon promotional literature.

Technical Specifications:
400 watts per channel continuous into 4 ohms at no more than 0.05% THD, 200 watts per channel continuous into 8 ohms at no more than 0.05% THD
Signal to Noise Ratio: 110 dB
Input Sensitivity: 150 mV for 1 watt output
Input Impedance: 22,000 ohms
Max power consumption: 1500 watts
Dimensions: 19 inches wide, 6.5 inches high, 14 inches deep
Weight: 65 pounds

I am also selling a pair of PSB Stratus Gold loudspeakers if you are interested.

Pick up in Missouri is welcome, but will ship unit anywhere in the lower 48 states. Buyer pays shipping charges. Thanks for looking.