Littoral
1417 posts
Oct 07, 2016
9:51 AM
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Set up, plug in, almost no sound, or weak 5% bad signal noise. SM 57 with the impedance transformer had been no problem into the amp, many gigs. All connections fine (2-3 pedals), same issue skipping pedals and straight into the amp, with the transformer. Changed xlr cable, same problem. Guitar 1/4 into the amp, plays fine.
I opened up the transformer, no trouble with connections that I can see.
Next day another transformer. Same problem. Amp works with the regular bullet.
Also, 57 works fine into the PA, no imp.
Last Edited by Littoral on Oct 07, 2016 9:58 AM
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Thievin' Heathen
845 posts
Oct 08, 2016
9:38 AM
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Sounds like an intermittent failure in your 57 or possibly the plug at your amp.
As/if I understand, the problem is following through cable and impedance transformer swaps. Loose pin at the 57? Have you hi & lo inputs on the amp?
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bonedog569
1065 posts
Oct 08, 2016
4:33 PM
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If I follow your troubleshooting procedure -The 57 works into the PA and the guitar works into the amp,- it seems like something to do with the inline impedance transformer - It's the only component not in the chain in every scenario where you having success. Unless I'm missing something. It could be the connection to the transformer - or the cord, if you are using a different one into the PA. Good luck.
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Bone's music videos
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Django
9 posts
Oct 08, 2016
4:36 PM
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Does the transformer go directly into the amp? If so did you try wiggling the transformer while it is plugged in to the amp to see if it cuts in and out?
Might be the added weight of the transformer is just enough to cause a weakening input jack to cut out. Might even be oxidization somewhere and as Thievin Mentioned intermittent.
If you haven't already wiggle every point there is a connection while speaking into the mic.
I would also check the mic into the pa with the transformer going into a hiZ input and see if that works.
Let us know how it goes.
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Littoral
1418 posts
Oct 09, 2016
6:25 AM
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I appreciate you all trying to sort through my puzzle. Wiggling the connection may be useful and checking the mic into the pa with the transformer going into a hiZ input would eliminate the transformer as the issue -I need to do that for sure.
As another puzzle piece I did use an old 1/4 to xlr cord with the 57 and no transformer and it worked. There may be a slight difference that I'd attribute to the quality of the cord being marginal.
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hvyj
3145 posts
Oct 09, 2016
7:27 AM
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Transformers do fail, and visual inspection of the connections will not exclude your IMT as being the source of your problem. I've been a long time user of XLR mics and so I have quite a bit of experience with IMTs. The IMT is often the weakest link in the signal chain. They are almost all reliable when new, but over time can be the source of hum, intermittent loss of connectivity, and the sort of problem you describe. So, you may want to try a different IMT. Recently I've been using Hosa rat tail IMTs (model MIT-176) with very favorable results.
Last Edited by hvyj on Oct 09, 2016 7:59 AM
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Greg Heumann
3281 posts
Oct 10, 2016
5:20 PM
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Just making sure your CABLE is XLR at BOTH ends....?
'Cuz if it is XLR to 1/4" and you're using a 1/4" to 1/4" IMPEDANCE MATCHING TRANSFORMER the CABLE is the problem. (It might be anyway.)
If that isn't it, remove the 57's connector and inspect - blue wire to pin 2, red wire to pin 3 - they both need to be there.
Unscrew the HEAD and inspect. Green wire to mic +, yellow wire to the other terminal. Both need to be connected.
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***************************************************
/Greg
BlowsMeAway Productions
See my Customer Mics album on Facebook
Bluestate on iTunes
Last Edited by Greg Heumann on Oct 10, 2016 5:24 PM
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Littoral
1420 posts
Oct 10, 2016
6:25 PM
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Greg, yes xlr at both ends -standard set-up.
The 57 works fine straight through the PA.
Trouble shooting I also found it also works through my amp with a 1/4 to xlr cable.
Still check pins?
btw, this is part of why I finally sent you my HE/astatic.
Last Edited by Littoral on Oct 10, 2016 6:27 PM
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Greg Heumann
3282 posts
Oct 11, 2016
7:44 AM
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Pretty much has to be the transformer - OR... Sometimes the 1/4" connector on the transformer gets bent at the base and it simply won't plug far enough into the jack to make the connections needed.
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***************************************************
/Greg
BlowsMeAway Productions
See my Customer Mics album on Facebook
Bluestate on iTunes
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barbequebob
3297 posts
Oct 11, 2016
11:18 AM
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From personal experience with XLR cables, certain mics are wired differently than others and sometimes, even tho a number of mics may be low-z, as an example, where the ground and the hot parts are can vary with some mics, and EV mics are sometimes wired a bit differently.
Also, I've found that you're more likely to run into a bad cable with the XLR connections than with guitar cables or mic cables with a screw on connector and with the latter two, the cable either works or it doesn't.
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Sincerely,
Barbeque Bob Maglinte
Boston, MA
http://www.barbequebob.com
CD available at http://www.cdbaby.com/cd/bbmaglinte
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