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Turntable hums thru amp even without t'table power?
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b104
Junior Member
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3. April 2006 @ 08:08 |
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I own an old Pioneer SA-410 amp that works perfectly with anything I usually connect to it.When I try to connect a "newer"? plastic covered Pioneer turntable PL-Z93 it immediately starts to hum,even without power being supplied to the turntable.It runs off a 12v power supply,so has a jack rather than a mains plug (turntable).I've cut the jack off & spliced a 12v 500ma trannsformer onto it but the hum is constant even without power to the turntable.I'm sure it has something to do with the earth as when I touch the pickup arm the hum drops considerably as does earthing the amp which has never been needed before.(phew).Really appreciate an answer to this pain in the butt!
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boxwrench
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3. April 2006 @ 09:24 |
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b104,Run a wire from the metal chassis on the turntable(look underneath the cabinet) and connect it to the ground screw on your amp,that should take care of the problem.The hum you are hearing is caused by the tone arm and cartridge not being grounded.
Best of luck.
Main System- Amd/64 3800x2 currently@ 2.5ghz. Asus A8N-E,win.xp-pro.4x1gb.Ocz platnium ddr 400,Maxtor 40gb.& 250gb.ide & 2x W.D.250 sata,Benq 1650V dvd Reader & Benq DW-1655 Writer,EVGA Geforce 7600gs,Creative Audigy-LS,Antec 750w psu. Vizio 37"hdtv monitor 1360x768@75hz.
This message has been edited since posting. Last time this message was edited on 3. April 2006 @ 09:27
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gerry1
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3. April 2006 @ 09:33 |
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Boxwrench is absolutely right. Even new amps usually have a grounding screw on the rear though.
OOPS!...misread your reply box, my apologies!
This message has been edited since posting. Last time this message was edited on 3. April 2006 @ 09:34
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boxwrench
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3. April 2006 @ 10:16 |
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@gerry1, Not a problem,you know one thing concerns me though,500ma. sure does'nt seem like enough to sufficiently power that t/t motor.I would think something a bit higher would be better and certainly would not do any harm. Just my other 2 cents worth!
Main System- Amd/64 3800x2 currently@ 2.5ghz. Asus A8N-E,win.xp-pro.4x1gb.Ocz platnium ddr 400,Maxtor 40gb.& 250gb.ide & 2x W.D.250 sata,Benq 1650V dvd Reader & Benq DW-1655 Writer,EVGA Geforce 7600gs,Creative Audigy-LS,Antec 750w psu. Vizio 37"hdtv monitor 1360x768@75hz.
This message has been edited since posting. Last time this message was edited on 3. April 2006 @ 10:18
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b104
Junior Member
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3. April 2006 @ 11:35 |
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Thanks for replies.Straight after posting,I ended up running an earth wire internally out to the amp & it worked perfect.The case is one of those all plastic bodies & the only external screw is'nt an earth anyway.Regarding the 12v transformer I wired onto it,it might get a bit hot.The only other transformers I can wire to it are, an old Nokia Salcompoy 12v 800 ma or an AC 12v.6A 7.2va adaptor. Would one of these handle the load better?
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b104
Junior Member
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3. April 2006 @ 11:39 |
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Thanks for replies.Straight after posting,I ended up running an earth wire internally out to the amp & it worked perfect.The case is one of those all plastic bodies & the only external screw is'nt an earth anyway.Regarding the 12v transformer I wired onto it,it might get a bit hot.The only other transformers I can wire to it are, an old Nokia Salcompoy 12v 800 ma or an AC 12v.6A 7.2va adaptor. Would one of these handle the load better?
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boxwrench
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3. April 2006 @ 20:33 |
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Great,I'm glad that worked out for you. Now for your power supply...what if any voltage and amperage requirements are marked on the t/t case or chassis?
Main System- Amd/64 3800x2 currently@ 2.5ghz. Asus A8N-E,win.xp-pro.4x1gb.Ocz platnium ddr 400,Maxtor 40gb.& 250gb.ide & 2x W.D.250 sata,Benq 1650V dvd Reader & Benq DW-1655 Writer,EVGA Geforce 7600gs,Creative Audigy-LS,Antec 750w psu. Vizio 37"hdtv monitor 1360x768@75hz.
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b104
Junior Member
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4. April 2006 @ 20:18 |
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Nothing anywhere inside or out,just 12 v dc input.I was thinking that maybe an old Nokia phone charger rated at 800ma would be a safe enough step up without doing any damage?
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boxwrench
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4. April 2006 @ 20:35 |
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That will probably be better,it certainly won't hurt.All you can do is use it and see.The worst that could happen is burning the little transformer up.
Have fun with your system!
Main System- Amd/64 3800x2 currently@ 2.5ghz. Asus A8N-E,win.xp-pro.4x1gb.Ocz platnium ddr 400,Maxtor 40gb.& 250gb.ide & 2x W.D.250 sata,Benq 1650V dvd Reader & Benq DW-1655 Writer,EVGA Geforce 7600gs,Creative Audigy-LS,Antec 750w psu. Vizio 37"hdtv monitor 1360x768@75hz.
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b104
Junior Member
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5. April 2006 @ 03:15 |
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No worries,thanks.It,s only the turntable I was worried about damaging.That's why I posted the original thread rather than just trying to earth it. Cheers!
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boxwrench
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5. April 2006 @ 10:07 |
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Yep,as long as you don't exceed the voltage requirements the current will not cause a problem. A motor will only draw it's max.current at full load (or start up in some cases). As long as the demand does not exceed the supply you'll be in good shape.If demand does exceed the supply the transformer will fail, and this is why having extra current available will not hurt.Now if you know what the max. current draw of the motor is you could provide a fuse to protect both the source and the motor, but thats another lesson for another day!
Main System- Amd/64 3800x2 currently@ 2.5ghz. Asus A8N-E,win.xp-pro.4x1gb.Ocz platnium ddr 400,Maxtor 40gb.& 250gb.ide & 2x W.D.250 sata,Benq 1650V dvd Reader & Benq DW-1655 Writer,EVGA Geforce 7600gs,Creative Audigy-LS,Antec 750w psu. Vizio 37"hdtv monitor 1360x768@75hz.
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gerry1
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5. April 2006 @ 12:11 |
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Thanks to both of you...this has been informative. You know your stuff box! You lost me after the grounding wire question LOL!
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boxwrench
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5. April 2006 @ 20:15 |
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Aw shuks Gerry!It's just another day at the office.lol!
I have to know this stuff,it's how I make my living.
Main System- Amd/64 3800x2 currently@ 2.5ghz. Asus A8N-E,win.xp-pro.4x1gb.Ocz platnium ddr 400,Maxtor 40gb.& 250gb.ide & 2x W.D.250 sata,Benq 1650V dvd Reader & Benq DW-1655 Writer,EVGA Geforce 7600gs,Creative Audigy-LS,Antec 750w psu. Vizio 37"hdtv monitor 1360x768@75hz.
This message has been edited since posting. Last time this message was edited on 5. April 2006 @ 21:11
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gerry1
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7. April 2006 @ 05:47 |
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What do you do?...are you an elecrtician or something of the sort?
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boxwrench
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7. April 2006 @ 22:36 |
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Well,yes and no...I'm a machinist/electrician...etc...
I install and repair machinery for a corrugated box company,so I get to do it all.
High voltage,got to love it!
Main System- Amd/64 3800x2 currently@ 2.5ghz. Asus A8N-E,win.xp-pro.4x1gb.Ocz platnium ddr 400,Maxtor 40gb.& 250gb.ide & 2x W.D.250 sata,Benq 1650V dvd Reader & Benq DW-1655 Writer,EVGA Geforce 7600gs,Creative Audigy-LS,Antec 750w psu. Vizio 37"hdtv monitor 1360x768@75hz.
This message has been edited since posting. Last time this message was edited on 7. April 2006 @ 22:37
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b104
Junior Member
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10. April 2006 @ 10:04 |
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Believe it or not,I emailed Pioneer stating the model no. & asked what the amperage would be(PL-Z93),Back when I first started this post.They replied that they knew of a PL-Z92,94,95,96 etc but had no record of my model no.93.They suggested that the amperage of the models similar but not the same as mine was about 300 ma.(Unbelievabable) If this is the case,do you think that I should scale back to the 500 ma adaptor or not worry?
I replaced it with an 800ma adaptor & seems to work ,no worries!
P.s. I have'nt ran it for prolonged periods though,so am not sure.
This message has been edited since posting. Last time this message was edited on 10. April 2006 @ 10:23
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boxwrench
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10. April 2006 @ 10:39 |
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Don't worry,It will only draw what it needs.Now spin some vinyl man!
Main System- Amd/64 3800x2 currently@ 2.5ghz. Asus A8N-E,win.xp-pro.4x1gb.Ocz platnium ddr 400,Maxtor 40gb.& 250gb.ide & 2x W.D.250 sata,Benq 1650V dvd Reader & Benq DW-1655 Writer,EVGA Geforce 7600gs,Creative Audigy-LS,Antec 750w psu. Vizio 37"hdtv monitor 1360x768@75hz.
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