Ugly Posted September 4, 2014 Share Posted September 4, 2014 Hi All, My little Sansui AU-101 arrived today and looks to be in good nick for its age. Before I plug it in though, I wanted to run a couple of things past the experts. 1. Voltage is set to 220v (as seen in one of the pictures below). It also has what looks to be an original sticker on the side that says 220v. Is this ok for Australian sockets? 2. The power plug says 125v (as seen in one of the pictures below). It looks to be an American plug but someone has bent the pins to fit in an Australian socket. Is this safe? Should I replace the plug or just bend it back into shape and use an adapter? 3. Is there anything else I should be checking? Thanks in advance. Link to comment Share on other sites More sharing options...
pete_mac Posted September 4, 2014 Share Posted September 4, 2014 You can set the voltage to 240V. Remove the screw holding the metal retaining bracket in place over the voltage selection 'plug'. Re-orientate the plug so that the white line faces upwards and points towards the '240' marking on the rear panel. Regarding the plug, it should be replaced with an appropriate AUS plug by a suitably qualified or experienced person. Link to comment Share on other sites More sharing options...
Ugly Posted September 4, 2014 Author Share Posted September 4, 2014 Champion! I was hoping I could just flick the voltage plug around My brother is a sparky so the plug is easy Thanks Pete! Link to comment Share on other sites More sharing options...
Bronal Posted September 4, 2014 Share Posted September 4, 2014 Will this amp be earthed internally? Link to comment Share on other sites More sharing options...
Zaphod Beeblebrox Posted September 4, 2014 Share Posted September 4, 2014 Will this amp be earthed internally? If you're asking "SHOULD this amp be earthed internally", then the answer is 'very probably'. I see no double earthing symbols, so, for safety, it should be earthed. Link to comment Share on other sites More sharing options...
Bronal Posted September 4, 2014 Share Posted September 4, 2014 If you're asking "SHOULD this amp be earthed internally", then the answer is 'very probably'. I see no double earthing symbols, so, for safety, it should be earthed. That wasn't the question I was asking. I was wondering whether Sansui amps intended for markets with two-pin plugs would be earthed as a matter of course, or whether the OP should have this done. Link to comment Share on other sites More sharing options...
pete_mac Posted September 4, 2014 Share Posted September 4, 2014 The Sansuis with 'figure' 8 power cables are not earthed as standard. I've compared earthed vs non-earthed versions of the same Sansui and there's no reason why a 3 conductor cable cannot be installed and appropriately wired into place to provide suitable earthing. Link to comment Share on other sites More sharing options...
Ugly Posted September 4, 2014 Author Share Posted September 4, 2014 Good to know. I'll get on to it Link to comment Share on other sites More sharing options...
Bronal Posted September 4, 2014 Share Posted September 4, 2014 The Sansuis with 'figure' 8 power cables are not earthed as standard. I've compared earthed vs non-earthed versions of the same Sansui and there's no reason why a 3 conductor cable cannot be installed and appropriately wired into place to provide suitable earthing. So it looks like changing the plug isn't the only thing that needs to be done. If it were me I'd go the whole hog and have the amp earthed and have an IEC plug installed at the same time time if that's possible. Link to comment Share on other sites More sharing options...
b@ndicoot Posted September 4, 2014 Share Posted September 4, 2014 Yeah good advice and I'd be getting it looked at, at the same r.e DC offset etc before you fry a voice coil or two in your speakers.. Link to comment Share on other sites More sharing options...
Ugly Posted September 4, 2014 Author Share Posted September 4, 2014 Ok. I'll get it checked out Link to comment Share on other sites More sharing options...
LogicprObe Posted September 4, 2014 Share Posted September 4, 2014 Don't forget the fuse. Link to comment Share on other sites More sharing options...
skippy124 Posted September 4, 2014 Share Posted September 4, 2014 Hi, Re the fitting of a 3 core mains cable. The existing plastic cable clamp (and the associated hole in the rear panel) is designed for the "flat" figure 8 cable used. If a round three core cable is going to be fitted, then the proper sized cable clamp bush should be used, and the "double D" hole in the chassis enlarged to maintain the correct cable clamping pressure (the double D hole shape should be preserved to prevent the cable/cable bush rotating). A round rubber bush/grommet can be used, but the cable should be internally restrained from putting strain on the internal connections, and from allowing the cable/cable grommet to rotate. Re the checking of checking the DC offset, this amp is a capacitor coupled output design, and as such there is no adjustment for DC offset. If you do check for DC on the output, you need to put an 8 ohm load in place when taking the measurement. Cheers John Link to comment Share on other sites More sharing options...
Ugly Posted September 4, 2014 Author Share Posted September 4, 2014 Thanks John. Do you replace the stock cable with 3 core as a matter of course, when you're working on these old amps? Link to comment Share on other sites More sharing options...
skippy124 Posted September 4, 2014 Share Posted September 4, 2014 It depends to some extent on the amp and the customer. I don't replace the mains cable as a matter or course. Your amp is a late model one ( manufactured Dec '73). It will most likely have bias adjustment trim pots on the main amp PCB, if you want to check the bias current let me know, the procedure and the bias current value is not shown in the service manual. Cheers John Link to comment Share on other sites More sharing options...
Ugly Posted September 4, 2014 Author Share Posted September 4, 2014 ok...thinking I may need to get a professional to look at it as this is sounding a bit beyond me . Link to comment Share on other sites More sharing options...
LogicprObe Posted September 4, 2014 Share Posted September 4, 2014 Better PM John then. Link to comment Share on other sites More sharing options...
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