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#1
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'live' turntable
I am using an Oracle Alexandria Mk. II turntable with an Alphason
HR-100S arm rewired with Van den Hul silver wire. My valve integrated amp does not have an input for Phono and hence no ground plug for the tonearm. My external phono preamp also does not have a plug for grounding. What I do is attach the wire connected to the tonearm's ground to a metal part of the amp's chassis. Although this eliminates the loud static and crackling that occurs when a tonearm wire is not grounded properly, two things happen to my turntable: 1. The metal parts give off a very light electrical charge. This includes the metal spindle, clamp, top plate and tonearm. 2. The original Oracle 'Groove Isolator' platter mat also becomes charged. The static is transferred to any record that is placed on top of it, and when the record is removed from the platter after being played, will crackle loudly. You can feel a strong static charge when you bring the record close to your arm. This crackling is also audible through the speakers. I replaced the valve amp with an older solid state amp from the 70s, a Nikko TRM 4500, which has dedicated inputs for phono and a grounding path as well. None of the incidents, described in the above two paras, happens. I tried using the Nikko as a pre and the valve amp as a power (thereby 'converting' the Nikko into a phono stage at the same time) and guess what? The metal knobs on the Nikko give off a small electrical charge!! As much as I love the tube sound, I have decided to shelve my valve amp until someone comes along with a solution! Many thanks for reading this, and I hope someone has an answer to my dilemma. raz |
#2
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'live' turntable
"Razak & William" wrote in message
... I am using an Oracle Alexandria Mk. II turntable with an Alphason HR-100S arm rewired with Van den Hul silver wire. My valve integrated amp does not have an input for Phono and hence no ground plug for the tonearm. My external phono preamp also does not have a plug for grounding. What I do is attach the wire connected to the tonearm's ground to a metal part of the amp's chassis. Although this eliminates the loud static and crackling that occurs when a tonearm wire is not grounded properly, two things happen to my turntable: 1. The metal parts give off a very light electrical charge. This includes the metal spindle, clamp, top plate and tonearm. 2. The original Oracle 'Groove Isolator' platter mat also becomes charged. The static is transferred to any record that is placed on top of it, and when the record is removed from the platter after being played, will crackle loudly. You can feel a strong static charge when you bring the record close to your arm. This crackling is also audible through the speakers. I replaced the valve amp with an older solid state amp from the 70s, a Nikko TRM 4500, which has dedicated inputs for phono and a grounding path as well. None of the incidents, described in the above two paras, happens. I tried using the Nikko as a pre and the valve amp as a power (thereby 'converting' the Nikko into a phono stage at the same time) and guess what? The metal knobs on the Nikko give off a small electrical charge!! As much as I love the tube sound, I have decided to shelve my valve amp until someone comes along with a solution! Many thanks for reading this, and I hope someone has an answer to my dilemma. Pragmatically, I'd try every combination of electrical plug orientation possible between the power amp, the preamp, the headamp, and the turntable/arm. There are 2x2x2x2 I believe, or 16 possible combinations. I suspect a ground orientation mismatch is causing the problem. |
#3
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'live' turntable
"Harry Lavo" wrote in message
... "Razak & William" wrote in message ... I am using an Oracle Alexandria Mk. II turntable with an Alphason HR-100S arm rewired with Van den Hul silver wire. My valve integrated amp does not have an input for Phono and hence no ground plug for the tonearm. My external phono preamp also does not have a plug for grounding. What I do is attach the wire connected to the tonearm's ground to a metal part of the amp's chassis. Although this eliminates the loud static and crackling that occurs when a tonearm wire is not grounded properly, two things happen to my turntable: 1. The metal parts give off a very light electrical charge. This includes the metal spindle, clamp, top plate and tonearm. 2. The original Oracle 'Groove Isolator' platter mat also becomes charged. The static is transferred to any record that is placed on top of it, and when the record is removed from the platter after being played, will crackle loudly. You can feel a strong static charge when you bring the record close to your arm. This crackling is also audible through the speakers. I replaced the valve amp with an older solid state amp from the 70s, a Nikko TRM 4500, which has dedicated inputs for phono and a grounding path as well. None of the incidents, described in the above two paras, happens. I tried using the Nikko as a pre and the valve amp as a power (thereby 'converting' the Nikko into a phono stage at the same time) and guess what? The metal knobs on the Nikko give off a small electrical charge!! As much as I love the tube sound, I have decided to shelve my valve amp until someone comes along with a solution! Many thanks for reading this, and I hope someone has an answer to my dilemma. Pragmatically, I'd try every combination of electrical plug orientation possible between the power amp, the preamp, the headamp, and the turntable/arm. There are 2x2x2x2 I believe, or 16 possible combinations. I suspect a ground orientation mismatch is causing the problem. I agree 100% with Harry. Just write all the possible combos down on paper, then methodically start the orientation change. west |
#4
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'live' turntable
You should have the main bearing grounded to the arm ground. Also try
grounding the table to the preamp rather than the phonostage to see if that helps. Some components have signal ground and chassis ground at the same potential and some do not. -Bill www.uptownaudio.com Roanoke VA (540) 343-1250 "Razak & William" wrote in message ... I am using an Oracle Alexandria Mk. II turntable with an Alphason HR-100S arm rewired with Van den Hul silver wire. My valve integrated amp does not have an input for Phono and hence no ground plug for the tonearm. My external phono preamp also does not have a plug for grounding. What I do is attach the wire connected to the tonearm's ground to a metal part of the amp's chassis. Although this eliminates the loud static and crackling that occurs when a tonearm wire is not grounded properly, two things happen to my turntable: 1. The metal parts give off a very light electrical charge. This includes the metal spindle, clamp, top plate and tonearm. 2. The original Oracle 'Groove Isolator' platter mat also becomes charged. The static is transferred to any record that is placed on top of it, and when the record is removed from the platter after being played, will crackle loudly. You can feel a strong static charge when you bring the record close to your arm. This crackling is also audible through the speakers. I replaced the valve amp with an older solid state amp from the 70s, a Nikko TRM 4500, which has dedicated inputs for phono and a grounding path as well. None of the incidents, described in the above two paras, happens. I tried using the Nikko as a pre and the valve amp as a power (thereby 'converting' the Nikko into a phono stage at the same time) and guess what? The metal knobs on the Nikko give off a small electrical charge!! As much as I love the tube sound, I have decided to shelve my valve amp until someone comes along with a solution! Many thanks for reading this, and I hope someone has an answer to my dilemma. raz |
#5
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'live' turntable
"Uptown Audio" wrote in message
... You should have the main bearing grounded to the arm ground. Also try grounding the table to the preamp rather than the phonostage to see if that helps. Some components have signal ground and chassis ground at the same potential and some do not. -Bill www.uptownaudio.com Roanoke VA (540) 343-1250 "Razak & William" wrote in message ... I am using an Oracle Alexandria Mk. II turntable with an Alphason HR-100S arm rewired with Van den Hul silver wire. My valve integrated amp does not have an input for Phono and hence no ground plug for the tonearm. My external phono preamp also does not have a plug for grounding. What I do is attach the wire connected to the tonearm's ground to a metal part of the amp's chassis. Although this eliminates the loud static and crackling that occurs when a tonearm wire is not grounded properly, two things happen to my turntable: 1. The metal parts give off a very light electrical charge. This includes the metal spindle, clamp, top plate and tonearm. 2. The original Oracle 'Groove Isolator' platter mat also becomes charged. The static is transferred to any record that is placed on top of it, and when the record is removed from the platter after being played, will crackle loudly. You can feel a strong static charge when you bring the record close to your arm. This crackling is also audible through the speakers. I replaced the valve amp with an older solid state amp from the 70s, a Nikko TRM 4500, which has dedicated inputs for phono and a grounding path as well. None of the incidents, described in the above two paras, happens. I tried using the Nikko as a pre and the valve amp as a power (thereby 'converting' the Nikko into a phono stage at the same time) and guess what? The metal knobs on the Nikko give off a small electrical charge!! As much as I love the tube sound, I have decided to shelve my valve amp until someone comes along with a solution! Many thanks for reading this, and I hope someone has an answer to my dilemma. raz Any and all turntable metalwork parts that are exposed should be grounded, either via the preamp or the mains inlet to the audio gear which must be properly earth/ground-bonded at all times. |
#6
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'live' turntable
That's right and it sounds as if his tonearm is not grounded to the
table. It could also be that the phono preamp does not have the signal grounded at the chassis potential or "floating", but that is less likely considering his description. Sometimes the best SNR can be achieved by running separate grounds and due to all of the possibilities with various equipment designs and implementaions (arm, table, preamp), I have not seen a single path that is best in all circumstances. -Bill www.uptownaudio.com Roanoke VA (540) 343-1250 "Jim Gregory" wrote in message ... "Uptown Audio" wrote in message ... You should have the main bearing grounded to the arm ground. Also try grounding the table to the preamp rather than the phonostage to see if that helps. Some components have signal ground and chassis ground at the same potential and some do not. -Bill www.uptownaudio.com Roanoke VA (540) 343-1250 "Razak & William" wrote in message ... I am using an Oracle Alexandria Mk. II turntable with an Alphason HR-100S arm rewired with Van den Hul silver wire. My valve integrated amp does not have an input for Phono and hence no ground plug for the tonearm. My external phono preamp also does not have a plug for grounding. What I do is attach the wire connected to the tonearm's ground to a metal part of the amp's chassis. Although this eliminates the loud static and crackling that occurs when a tonearm wire is not grounded properly, two things happen to my turntable: 1. The metal parts give off a very light electrical charge. This includes the metal spindle, clamp, top plate and tonearm. 2. The original Oracle 'Groove Isolator' platter mat also becomes charged. The static is transferred to any record that is placed on top of it, and when the record is removed from the platter after being played, will crackle loudly. You can feel a strong static charge when you bring the record close to your arm. This crackling is also audible through the speakers. I replaced the valve amp with an older solid state amp from the 70s, a Nikko TRM 4500, which has dedicated inputs for phono and a grounding path as well. None of the incidents, described in the above two paras, happens. I tried using the Nikko as a pre and the valve amp as a power (thereby 'converting' the Nikko into a phono stage at the same time) and guess what? The metal knobs on the Nikko give off a small electrical charge!! As much as I love the tube sound, I have decided to shelve my valve amp until someone comes along with a solution! Many thanks for reading this, and I hope someone has an answer to my dilemma. raz Any and all turntable metalwork parts that are exposed should be grounded, either via the preamp or the mains inlet to the audio gear which must be properly earth/ground-bonded at all times. |
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