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PKI 6th May 2012 04:21 PM

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!

Zen Mod 6th May 2012 09:38 PM


that's not ok

PKI 6th May 2012 10:11 PM

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?

Zen Mod 6th May 2012 10:31 PM

pics , please

GaryB 7th May 2012 01:32 AM


Originally Posted by PKI (
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.


PKI 8th May 2012 03:10 PM

3 Attachment(s)
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.

Zen Mod 8th May 2012 04:57 PM

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

PKI 8th May 2012 05:46 PM

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?

Zen Mod 8th May 2012 06:07 PM

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

PKI 8th May 2012 06:11 PM

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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