The ART27A is a very special amplifier designed for reference quality use by a limited number of discerning audiophiles - no more than 250 of the stereo ART27A will be produced.
 
Speaker systems vary in sensitivity with some highly regarded speakers measuring an output of 86 dB or less from one Watt at one meter to other high-efficiency systems producing as much as 104 dB. Further, room dimensions, speaker placement, and listening placement vary widely – also significantly impacting power demands.
 
The circuit for this amplifier is designed for Class A operation of KT88 output tubes configured as triode devices – a single pair for each channel achieves 36 Watts per channel in the stereo ART27A suitable for highly efficient systems – ample power for the vast majority of applications.
 
The amplifier boasts independent discrete regulated power supplies for the output stage in addition to separate regulated supplies for both input and inverter stages with separate regulators for each channel in the ART27A.
 
CJ's design team has long appreciated the critical importance of parts quality in achieving top performance.
 
conrad-johnson's commitment to executing their reference level products with only the highest quality parts is unmatched in the industry. Precision laser-trimmed bulk metal foil Vishay resistors are used throughout the voltage gain stages and related power supplies. CJD Teflon dielectric capacitors are used for coupling the inverter stage to the output stage, and to bypass the large value polypropylene capacitors in the regulated power supplies for the voltage gain and inverter stages.
 
Amplifier output is coupled to speakers through proprietary wide-bandwidth Translinear output transformers optimized for Class A operation of triode connected KT88s. Even the machined OFC connectors and the internal wiring have been carefully selected for optimal sonic performance. Attention to every detail enables CJ to extract the full potential from their circuit designs and ensures that their products will perform to this potential for years to come. The ART27A amplifier is built without compromise to achieve a new standard in musical performance, and it is built to last.