roundhome Posted August 28, 2004 Report Share Posted August 28, 2004 HelloI just picked up a ar amp, model au.I gave 20 bucks for it but he said that it had weak output and that it needed caps then he was pocking around and it smoked. so to start with I need a service man and diagram for it. I cant down load the stuff on the amp from the forum. any help would be great I would like to drive my AR3s that now have solon caps and silver wire with this. And a AR turntable.the face is near perfict with all knobs and the logo looks great I have opened it and found a burnt diode 200 sumething cant tellThank you Jim Link to comment Share on other sites More sharing options...
SteveS Posted August 28, 2004 Report Share Posted August 28, 2004 I just picked up an AR receiver as well. Works, just needs a little cleaning. The back says it is Model W (serial W00270).It looks just like the one here http://rummageads.com/xstereo/ARreceiver/. But for the fact that someone painted the face black (probably back in the 80's). Luckily, they masked off the control labels, but not the AR emblem. (I can see it underneath)Fortunately as well, the paint is cheap and aged, and comes off with a littl elbow grease and alcohol, so hopefully I can restore it to original. Good luck with yours--SteveI think this is what you were trying to open on the AR electronics page: Here's what it says about the AR amp:Some specifications on the AR amplifier! (From AR Literature)Thanks to Larry Jenkins (OldestLJ@aol.com) for these! "The AR Amplifier is an integrated stereo preamplifier/control and poweramplifier, all silicon solid-state."Power Output - each channel, both channels driven - 60 watts RMS 4 ohms50 watts RMS 8 ohms30 watts RMS 16 ohms Distortion - any power output level up to an including full rated powerIM (60 and 7,000hz, 4:1) less than .25%, harmonic distortion,less than .5% from 20hz to 20khz.Freq Response - +/- 1db 20hz to 20khz at flat settingsSuggested Retail - $250 w/ black aluminum cover, $15 extra for oiledwalnut wood cover--------------------------------------------------------------------------------Thanks to Tom Tyson for these comments on the AR amplifier! The AR integrated amp was designed in the late 60's by AcousticResearch's engineers with primary design work being done by a fellow bythe name of Brodzinsky (sp), who has a couple patents relative to thisamp. One was the "standby power supply," in which the amp's powersupply idles when the unit is plugged in, and bias voltage/circuitvoltage is applied when the switch is turned "on." The other patentrelated to the actual biasing circuit itself. The amp was followedabout a year later with an FM tuner, and in 1970 AR introduced the ARReceiver which incorporated both the integrated amp and the tuner intoone enclosure. Oiled walnut cases were available for each unit.The amplifier, which cost $250, was rated for use with 4-ohm, 8-ohm and16-ohm speakers, common for the day (e.g., the KLH-4 was 16-ohm, as weremany of the horn speakers and some electrostatic speakers such as themodel 9, etc.). Into 4 ohms, the amp was rated at 60 watts/channel,rms, both channels driven, 20-20,000 Hz., with harmonic distortion lessthan 0.5% and intermodulation distortion less than 0.25%; into 8-ohms itproduced 50 watts; into 16 ohms it produced 30 watts.When *Audio,* *Stereo Review* and other magazines tested the AR amp,they were amazed to find that the amp could put out over 100watts/rms/channel into mid frequencies, and that it could produce over90 watts into 4-ohms, from 20-20,000 Hz. It was especially stable withcapacitive-reactive, low-impedance loads such as certain AR speakers(AR-LST, AR-LST-II, and AR-10Pi) and electrostatic speakers. :) Link to comment Share on other sites More sharing options...
soundminded Posted August 28, 2004 Report Share Posted August 28, 2004 This was my first solid state amplifier and it still works although there is a DC offset of 0.5 volts on one channel output and 4 volts on the other. This has been an outstanding unit and a great value. In 1968 I paid about $190 at Newmark and Lewis (now defunct) for use driving KLH model 6. I presume it was intended to power AR3a and anything less demanding which was just about everything else on the market. As a low cost reilable alternative to Dynaco PAT4/Stereo 120, it seemed in keeping with AR's philosophy of providing no compromise equipment that was practical and affordable by people of average means. I think it was featured in a popular science article called the Audio System I wish I owned. Also in the system were the Empire 999VE cartridge and the Rectilinear III speakers. I don't recall the turntable. Link to comment Share on other sites More sharing options...
SteveS Posted August 29, 2004 Report Share Posted August 29, 2004 Where might find a schematic for this AR receiver (1972--I think)?ThanksSteves Link to comment Share on other sites More sharing options...
Guest StuA Posted September 5, 2004 Report Share Posted September 5, 2004 I have an ar06 I found a schematic diagram for some Ar amps on a zip file athttp://www.arsenal.net/speakers/ar/AR-UK/AR-UK.htmgood amp nice soundHowever need info on their cd playersStuA Link to comment Share on other sites More sharing options...
dynaco_dan Posted September 25, 2004 Report Share Posted September 25, 2004 >Where might find a schematic for this AR receiver (1972--I>think)?>Thanks>StevesAmong the many items that I own, I have a schematic of the AR receiver. I will be providing a copy for the archives after I un-pack from moving. All the literature I have was provided to me at no cost and I feel like a librarian that wishes to pass on these to others. At no charge only. Scanning or photocopies will be sent to the webmaster Mark as soon as I possibly can and he can decide the best way of presenting them to you, not withstanding any copyright infringement. Every so often, I browse through my binders and I am sure there is lot's of other interested parties. When I have un-packed I will post a list of the literature that I have. AR is just one of the brands that I have saved. Have a great day. Link to comment Share on other sites More sharing options...
roundhome Posted September 25, 2004 Author Report Share Posted September 25, 2004 Hello I wouuld be willing to pay you for a photo copy of them I have had little luck reading most items like this on the computerI have a MAC and it has trouble downloading thingsThanks JIm Link to comment Share on other sites More sharing options...
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