truckguygmc23 Posted May 9, 2007 Share Posted May 9, 2007 Hi, I just acquired an old Marantz 2230 receiver and it does not have the jumpers for the amp section. I have an 1/8 circular piece of stainless steel. If I cut this to size and form it, can I use this homemade jumper without any risk of damaging the unit? I'm just not sure if stainless steel would work well as a jumper. Thanks for your help! Quote Link to comment Share on other sites More sharing options...
mas Posted May 9, 2007 Share Posted May 9, 2007 Technically it can work, but I would defer to a short jumper. Quote Link to comment Share on other sites More sharing options...
truckguygmc23 Posted May 9, 2007 Author Share Posted May 9, 2007 short jumper? Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted May 9, 2007 Share Posted May 9, 2007 short jumper? Just use copper: Some typical electrical conductivities Electrical Conductivity (S·m-1) Temperature(°C) Notes Silver 63.01 × 106 20 Highest electrical conductivity of any metal Copper 59.6 × 106 20 Annealed Copper 58.0 × 106 20 Referred to as 100 %IACS or International Annealed Copper Standard. The unit for expressing the conductivity of nonmagnetic materials by testing using the eddy-current method. Generally used for temper and alloy verification of Aluminium. Aluminium 37.8 × 106 20 Seawater 5 Drinking water 0.0005 to 0.05 Deionized water 5.5 × 10-6 changes to 1.2 × 10-4 in degassed water; see J. Phys. Chem. B 2005, 109, 1231-1238 Quote Link to comment Share on other sites More sharing options...
LarryC Posted May 9, 2007 Share Posted May 9, 2007 Those old steel things, which basically connected only the "hot" part of the plugs together, weren't terribly good. Audioquest makes a pair of what are basically very short interconnects (?3"-4" long), that at $25/pr. seem a little pricey to me, but they sure improved things the one time I switched. Still, no reason you couldn't use a pair of interconnects of any length. Quote Link to comment Share on other sites More sharing options...
truckguygmc23 Posted May 9, 2007 Author Share Posted May 9, 2007 I appreciate the science class! LOL Anyways, I guess I can make this simple, will the stainless steel ones work satisfactory or no? I do not need audiophile quality sound from this unit. I just don't want to damage it. Thanks! Quote Link to comment Share on other sites More sharing options...
mas Posted May 9, 2007 Share Posted May 9, 2007 I am assuming that there are two RCA jacks that are in effect shorted by the jumpers. Deferring of course to the actual topology if this is different, these can each be replaced by 2 RCA plugs interconnects. But to answer your question, no, they will not harm anything! Sorry, I was delayed in noticing any posts since the "jumper? " post!. Yup, those jumpers are what I was referring to!![] Quote Link to comment Share on other sites More sharing options...
IB Slammin Posted May 9, 2007 Share Posted May 9, 2007 short jumper? Just use copper: Some typical electrical conductivities Electrical Conductivity (S·m-1) Temperature(°C) Notes Silver 63.01 × 106 20 Highest electrical conductivity of any metal Copper 59.6 × 106 20 Annealed Copper 58.0 × 106 20 Referred to as 100 %IACS or International Annealed Copper Standard. The unit for expressing the conductivity of nonmagnetic materials by testing using the eddy-current method. Generally used for temper and alloy verification of Aluminium. Aluminium 37.8 × 106 20 Seawater 5 Drinking water 0.0005 to 0.05 Deionized water 5.5 × 10-6 changes to 1.2 × 10-4 in degassed water; see J. Phys. Chem. B 2005, 109, 1231-1238 It was always my belief that PLATINUM was the best metal conductor. No? tc Quote Link to comment Share on other sites More sharing options...
djk Posted May 9, 2007 Share Posted May 9, 2007 The original jacks in the Marantz are self-shorting. If they are not shot they should not need jumpers. Quote Link to comment Share on other sites More sharing options...
WMcD Posted May 9, 2007 Share Posted May 9, 2007 I don't have a Marantz but my old JVC has what I'm quite certain is similar to what you've got. The receiver has a set of pre-amp outputs and power amp inputs at the back panel. These are RCA females. The jumper is a U-shaped piece of metal which serves an an electrical connection. It is essentially two RCA males with no shield. And of course Larry C is showing you a set of short RCA connectors which will do the same job (a good idea in my view). I believe this jumper scheme is there just to give an extra level of flexibility. When removed you can directly feed the power amp and you have a pre-amp output. And you can add an equalizer, etc. I would recommend you make some jumpers out of ordinary copper wire rather than stainless steel, or get the connectors which Larry suggests. My caution about using stainless steel is because I think it might create a corrosion problem. A connection of dissimilar metals can set up a little electrolydic (sp) cell. I don't know if that is the case here but it is something to think about. I've never seen electrical connections made of stainless steel, at all. Something is up with this. and I think it is not just resistance. Also, it is my understanding that there are many compositions of what we know as stainless steel. Some have very high amounts of chromium, and others not. My copy of Mark's Handbook of Mechanical Engineering is at the office, but such is what I recall. In my experience, some stainless will attract a magnet, others not at all. This is just a demonstration of the different compositions. Gil Quote Link to comment Share on other sites More sharing options...
HarryO Posted May 11, 2007 Share Posted May 11, 2007 I've got an extra pair of originals if you want them. Send me your address and I'll stick them in an envelope for you. HarryO hbailey1@earthlink.net Better measure the distance between the jacks. I've got about 50 or so all in one drawer. Quote Link to comment Share on other sites More sharing options...
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