Audio Research HD-220 Hybrid Stereo Amp!

Audio Research HD220 Hybrid Stereo Amp In Classic Silver and black with handles a powerful 220 watts into 8 ohms and 400 ohms into 4 ohms. Comes complete like new in factory box. Current model Serial # 67103910. Looks like new condition rating lower to be conservative. Has a small hair scuff on face so small does not show up in pictures or take away from it's handsome appearance. Otherwise 8 or 9/10 but most peoples ratings. This amplifier is a benchmark in Audio Research's line up of products as the first to use transistor based output devices in the output stage and valves in the gain stage. The input is JFET with which is identical to the REF110's frontend. The tube component is a 6922 dual triode gain stage, which in turn feeds a 6H30 dual triode cathode follower. The HD220 is rated at approx 220 watts into 8 ohms and 400 ohms into 4 ohms. The chassis size is identical to the VT100 series and the REF110 and weighing in at 27kg this is a product that would be able to be placed in most compact locations. Supporting a huge 300K ohms Balanced input impedance this amplifier has potential for massive drive and dynamics that can really be felt as well as heard even when driven with under powered line stages. Because of the lack of 6550C output tubes this amplifier runs much cooler then your typical all tube Audio Research amplifier of similar power rating. The tube component of the HD220 is comprised of one 6922 dual triode gain stage, which in turn feeds one 6H30 dual triode cathode follower per channel. Again dual tube dampening rings are supplied for all 4 tubes and are designed to cut microphonic vibrations to low levels.The rear panel shows there is provision for Balnaced (300K ohm) as well as Single Ended input (150K ohm). There is also the added benefit of 12V trigger (not shown) for On/Off remote control operation via one of A.R.C. line stages. A 20-amp IEC-connector is used for the best possible power supply. Identical to all of A.R.C.'s REFERENCE amplifiers. Tube changing is no longer a matter of guess work with the latest models. Tube hour counter is now provided for easy tube changing reference. Power supply regulation is all solid-state to assure stability and consistency under high-current-demand loads, and power supply energy storage is a startling 200,000 mF capacitance for explosive dynamics and rock-solid bass impact and control. The tube component of the HD220 is comprised of one 6922 dual triode gain stage, which in turn feeds one 6H30 dual triode cathode follower per channel. Again dual tube dampening rings are supplied for all 4 tubes and are designed to cut microphonic vibrations to low levels. This amplifier is a benchmark in Audio Research's line up of products as the first to use transistor based output devices in the output stage and valves in the gain stage. The input is JFET with which is identical to the REF110's frontend. The tube component is a 6922 dual triode gain stage, which in turn feeds a 6H30 dual triode cathode follower. The HD220 is rated at approx 220 watts into 8 ohms and 400 ohms into 4 ohms. The chassis size is identical to the VT100 series and the REF110 and weighing in at 27kg this is a product that would be able to be placed in most compact locations. Supporting a huge 300K ohms Balanced input impedance this amplifier has potential for massive drive and dynamics that can really be felt as well as heard even when driven with under powered line stages. Because of the lack of 6550C output tubes this amplifier runs much cooler then your typical all tube Audio Research amplifier of similar power rating. Best to call (David) www.weinhartdesign.com with questions in Los Angeles Showroom 310-472-8880 or on my cell after hours and weekends 310-927-2260. Weinhart Design has lots of other items new and used and if you're in Los Angeles or visiting please accept my invitation to experience our World Class Audio Showroom and please visit our web site @ www.weinhartdesign.com We are always interested in purchasing quality Audio and Video items, CD & LP collections and most quality trades are welcomed. All sales out of California are State Sales Tax exempt. California State Sales Tax of 8.75% applies for items picked up or shipped to a California address. We accept payments by Bank Wire Transfers without fees and is the only form of payment on all sales out of the U.S. and Canada. We prefer this method of payment and also makes shipping to addresses other than billing agreeable. VISA, MC and Papal are gladly accepted within the U.S. and Canada as long as the charge is approved and shipping to the billing address on record and adds 3% to cover costs. Please call me directly in my world class showroom in Los Angeles weekdays @ 310-472-8880 or any reasonable time on my cell including weekends @ 310-927-2260 and I can answer your questions and help you with all of your new and pre owned needs. www.weinhartdesign.com