# Strange Behavior when measuring Phono to Output Loads (ground loop?)

**URL:** <https://forum.quantasylum.com/t/strange-behavior-when-measuring-phono-to-output-loads-ground-loop/436>\
**Category:** QA40x\
**Created:** [August 12, 2021, 11:44pm UTC](https://forum.quantasylum.com/t/strange-behavior-when-measuring-phono-to-output-loads-ground-loop/436 "2021-08-12T23:44:23Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![VAR](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.quantasylum.com/var/32/959_2.png) [@VAR](https://forum.quantasylum.com/u/VAR)\
**Post date:** [August 20, 2021, 6:49pm UTC](https://forum.quantasylum.com/t/strange-behavior-when-measuring-phono-to-output-loads-ground-loop/436/21 "2021-08-20T18:49:24Z")

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Thanks Matt for the suggestion- will hook back up and zoom in a bit later this weekend. I snuck in some time to hook up the NAD to my speakers and a TT and just listened to some LP’s- Phono sounds fine at a level that the tests showed should have caused a problem (and beyond until my wife complained), so I am pretty confident in the amp not being a problem. Actually, the NAD sounds good through both the phono and CD inputs.

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**Author:** ![VAR](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.quantasylum.com/var/32/959_2.png) [@VAR](https://forum.quantasylum.com/u/VAR)\
**Post date:** [August 21, 2021, 3:52am UTC](https://forum.quantasylum.com/t/strange-behavior-when-measuring-phono-to-output-loads-ground-loop/436/22 "2021-08-21T03:52:37Z")

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So here are some expanded Time plots:

 ![time0](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/1X/beceb3033c181a6b79cce1444c48861c9eb3456f.jpeg)

and:

 ![time1](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/1X/cc8688960428bb41f82ed00d1f0c09ae394bc66f.jpeg)

and 1 more:

 ![time2](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/1X/1749c17fef875d20a8966c68b7b5bff092f19820.jpeg)

Hopefully it will mean something. I am going to look at the Time display through the CD input for comparison as well…Thanks!

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