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Old 6th May 2012, 05:21 PM   #1
PKI is offline PKI  United States
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Default Strange behavior of my Threshold SL10

Is it ok that even if I plug only one input R or L you still have a sound from both channel on output? Does the ore go to mono mode if only there is only one input? Thanks!

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Old 6th May 2012, 10:38 PM   #2
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nope

that's not ok
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Old 6th May 2012, 11:11 PM   #3
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Thanks! But when I plug two channels and use balance signal goes from one channel to another. Any idea for further tests to find a problem? Can it be because of some old pots/switch?
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Old 6th May 2012, 11:31 PM   #4
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pics , please
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Old 7th May 2012, 02:32 AM   #5
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Quote:
Originally Posted by PKI View Post
Any idea for further tests to find a problem? Can it be because of some old pots/switch?
I'd check the cables you're using as well. If one of them has a problem with the ground connection then you might find signal appearing in funny places as it tries to close the signal loop.

---Gary
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Old 8th May 2012, 04:10 PM   #6
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Here are some photos(sorry for the quality, I will try to re take them).
I've double checked all the cables/connectors and external connections all good.
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File Type: jpg IMG_1026.jpg (742.8 KB, 180 views)
File Type: jpg IMG_1027.jpg (799.1 KB, 167 views)
File Type: jpg IMG_1028.jpg (764.6 KB, 161 views)
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Old 8th May 2012, 05:57 PM   #7
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everything looks OK , but it's hard to say from so grainy pictures ;

it's obviously recapped sometimes in the past ( Silmics aren't original caps , for sure )

probably mistake was made during re-assembling wires back to switches-connectors

try harder with pictures
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Old 8th May 2012, 06:46 PM   #8
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I recapped it :-) So everything should be good there. I guess one thing was that I was having hard time assembling all these tiny rotary switches after I deoxited them. Do you thing you can shorten something in there so you have this "mono" problem while switching functions will be ok?
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Old 8th May 2012, 07:07 PM   #9
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well , something is obviously wrong

useful and easy procedure these days , while working on gadget, is to make plenty of digi pictures

it can save you later , if nothing else - time saving during assembly ( less thinking needed) can be substantial

dunno ... comparing your pictures with pictures of SL10 from Treshold broshures , it seems all wires on pcbs are in place , and I resume that you didn't desolder any of them
culprit can be either on switches or pots - take a good look for unintentional shorts
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Old 8th May 2012, 07:11 PM   #10
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Thanks! I can try to solder in another attenuator. Will more resistance one decrease the gain (it is too much of it now. do not use more than two steps up)?
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