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Phase Linear History
StereoManuals - StereoManuals is owned and operated by Rick Stout. We are hosting the sub-domains show here and intend to keep them up for the benefit of the audio community. Please visit our main site for a huge selection of very high quality audio (and other) manuals, articles, customer system pages and more. We also sponsor two audio discussion groups to assist the audio community. Vintage Technics Database - We host the former www.vintagetechnics.com site since it's domain expired. It has been recoded for better speed and is being updated. Phase Linear History Reference Site -  Anthony Young is a friend and the author the former www.phaselinearhistory.com web site. He lost ownership of the domain name and his original files. With his blessing, we have resurrected the site. Anthony has authored other excellent Reference Sites. StereoManuals has Phase Linear Service Manuals and other literature for most of the popular models. If you do not support us via manuals purchases, please consider making a small donation to help with expenses regarding the Phase Linear History pages.
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Phase Linear Amplifiers  
200 Series   300 Series   400 Series   700 Series   D-500   Pro Series   DRS Series
Phase Linear D-500 Amplifier


The D-500 was Phase Linear's most powerful and expensive amplifier. Its designation came from its rated output of 505 watts per channel. It was introduced in 1978 as the Dual 500 Series Two, even though there had been no "Series One", in order to coincide with the other Series Two components in the Phase Linear line.

Bob Carver had not completed the design of this amp when he left Phase Linear in 1977 to launch Carver Corporation. The design was finalized by Phase Linear staff engineers in the closing months of 1977.The design differed considerably from the 400 and 700. The front panel layout was nearly identical to the 700 Series Two, but the comparison ends there.



    The transformers (one for power and one for the AC relay) were mounted inside the metal enclosure.  The heat sinks were laid out horizontally, with speaker and other connections above the heat sink. A cooling fan was used to draw heat away from the heat sinks. Unless the amp was driven hard, the fan usually did not have to run.  List price was $1395.95 and tipped the scales at 70 pounds.

Later designated the D-500 due to a name dispute with the turntable manufacturer Dual, Phase Linear discontinued this amp after the 1980 model year when the list price reached a breath-taking $1600. It was magnificent excess, and marked the zenith of Phase Linear amplifier design.

Left and right channel input could be varied with the input selector knob. The antiquated VU: meters were not carried over to the Series Two amplifiers.  In their place were new variable LED meters to more accurately reflect the amplifier's output. as hown in this closeup.  The Series Two amps were certainly more attractive than the first generation and the quality of the design is evident. The Series Two amps do not look dated even today.


This closeup of the front panel shows this to be one of the earlier models because it still has the Dual 500 designation. After the name dispute with Dual turntables, the designation on the front would simply read D-500
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