Alembic Guitars Club
Alembic products => Owning an Alembic => Troubleshooting => Topic started by: bumhucker on December 04, 2016, 11:43:03 AM
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I just bought a used F1x and I love it very much but I'm having a hum issue. The DI out hums. The ground lift switch has no effect. If I have the full range out and the DI plugged into the same mixer then the hum is gone. The Full Range out by itself sounds amazing. I tried cables, power sources etc. I cleaned the FX. Return jack, exercised the jacks., tried different tubes. Anyone have any ideas? I searched this forum and read up. I am going to have a tech check it out but the insight on this forum is always top notch and would the tech at the very least. Thanks!!
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Have you checked this post and Edwin's advice. http://club.alembic.com/index.php?topic=22256.0
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Thanks--I'll have them checked! That actually may be related to another thing I noticed.
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I don't think it's filter caps if there is a way which you can hook it up without hum. Old filter caps create global hum. This sounds like a bigger problem between stage power and the FOH or perhaps a bad mic cable. As an interim fix, you could always run a DI off the full range out between the preamp and the amp. If you still get hum, then you know that it's not you.
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Thanks--I did try it through two different mixers in different locations with different cables and power still have issues. I also tested my GK head's DI and it was fine in the same situation. I appreciate the info-this will help me and the tech narrow it down.
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Just for posterity-
I finally found that the xlr jack ground tab (the 4th connection on the jack) was not actually grounding to the chassis! I noticed that it was a Switchcraft so maybe it was a replacement? I put a Neutrik in there and it seems to have solved it!! There was no metal to metal contact on the old one. I realize I could have just scraped the inside of the screw hole on the jack but I figured a nice jack can't hurt....
Thanks again!