sloper Posted April 18, 2021 Share Posted April 18, 2021 Goodaye all Just picked up another Sansui AU505 to do up. First thing l noticed was the earth pin had neatly been cut off the 3 pin plug. A former owner proberly had a earth loop going on. Either that or they were a thrill seeker. Had packaging tap to insulate the low voltage feed from the transformer. Fuses are intact . Apart from that its a pretty clean unit. This is going to be fun. Gotta stop buying Sansui amps. regards Bruce Link to comment Share on other sites More sharing options...
audiofeline Posted April 19, 2021 Share Posted April 19, 2021 Yes, I would change the plug so it's safely earthed. I liked the look of the black Sansui's in the 70's, although I ended up getting a silver JVC with my limited funds. Link to comment Share on other sites More sharing options...
muon* Posted April 19, 2021 Share Posted April 19, 2021 I had an AU-505 once, very nice sound, and internally looks like a cross between the AU-555 and the AU-555A. Link to comment Share on other sites More sharing options...
mbz Posted April 23, 2021 Share Posted April 23, 2021 The AU-505 is a nice one, considered something of a "giant killer" (bang for buck) on audiokarma who have several nice threads showing upgrades etc, they include the blaxandall diode and a cap mostly copied from the 555A/555(?) I run my fully refurb'd unit through some moderately efficient vintage altecs (102dB?) for background listening. Mine had a hum issue which was a pita to track down. Hum persisted after converting to a star GND, noticed one of the tone caps was resting on the p-on lamp, moved cap and all good (doh!) Not good about the earth pin, like you say, thrill seeker... Link to comment Share on other sites More sharing options...
mbz Posted April 23, 2021 Share Posted April 23, 2021 Looking at a marantz 2285B where both the active and neutral are switched via p-on/off switch. Both lines have snubber caps. The switches in these units are prone to failure so maybe switching both is an idea of extending the switch life. Have implemented a triac for switching. Anyone with other examples of both active/neutral switching? Link to comment Share on other sites More sharing options...
sloper Posted April 24, 2021 Author Share Posted April 24, 2021 Put it on the DBT for a quick test. Bulb lit up dim and then nothing, not sure if it was the amp or bulb. No magic smoke leaking out. It can wait. l have other AU505's l can use. Finishing up a Sansui AU2900, AU417 and a spare AU505. Figure if l flip the lot l can get a Alpha in the door without any grumbling. regards Bruce Link to comment Share on other sites More sharing options...
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