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Old 3rd December 2010, 10:08 PM   #51
Salas is online now Salas  Greece
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Quote:
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.... must try that configuration.
It will not be immune to the circuit, converts to SE. Can help not picking on the TT cabling run until phono I guess.
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Old 4th December 2010, 11:33 AM   #52
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Lundahl specifies that the primary must have a gnd reference... I always wondered why ?
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Old 4th December 2010, 11:44 AM   #53
SY is offline SY  United States
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Quote:
Originally Posted by Salas View Post
But, wait a minute... if primary is floating and cart was surely not grounded, that is balanced transfer.
Only if all impedances to ground are equal. That means a carefully balanced primary winding on the transformer, which is not always the case.

What happens if you put a finger on one of the cartridge pins?
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Old 4th December 2010, 01:20 PM   #54
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Will see next time I visit the installation. Or will ask. If its balanced good should make no noise? Can I put two equal resistors in the primary and ground the middle point?
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Old 4th December 2010, 01:33 PM   #55
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Yes.. but it also affects reflect load to the cart.... IMO (as an unexperienced guy in this aspects) it might be quite difficult to match some carts to some TX.
cinemag & dl103 are in love
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Old 4th December 2010, 03:03 PM   #56
RCruz is offline RCruz  Switzerland
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cinemag & dl103 are in love
This is a very valuable info.... Thank you
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Old 4th December 2010, 03:28 PM   #57
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DL-103 and Partridge 977 are also in love if 1:6 ratio is sufficient, seems to sound best run straight into 47K, and the best thing is a raw pair will run you less than $80 USD on eBay.uk..
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Old 4th December 2010, 03:43 PM   #58
SY is offline SY  United States
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Can I put two equal resistors in the primary and ground the middle point?
You can, but that "fix" has a limited range and is quite incomplete. If the transformer primary is not well balanced, it's not well balanced, and there's not much you can do externally to fix it.
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Old 4th December 2010, 03:54 PM   #59
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What is supposed to do when I will touch a cart pin if its well balanced? Will have to wait to know because its still loaned to another HiMC cart system playing without the SUT.
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Old 4th December 2010, 03:57 PM   #60
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What is supposed to do when I will touch a cart pin if its well balanced? Will have to wait to know because its still loaned to another HiMC cart system playing without the SUT.

If not common mode it will buzz..
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