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#1
03-25-2020, 08:30 PM
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Bad hum on Martin HD28E Retro when plugged in?
I get a bad hum on my Martin HD28-E Retro whenever it gets plugged in and was wondering if any one of you might have experienced this before? I have a feeling it's the Aura electronics that is causing this as I can get the hum to stop when I randomly place a finger or two on the Aura PCB board.
Wondering if any one has any advice for me? I am located outside of the US so sending it back to Martin is going to be tough here. Thanks! 
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#2
03-25-2020, 08:33 PM
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Are there any Authorized Martin Repair Centers or decent guitar techs in your neck of the woods???
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Emerald X20 Emerald X20-12 Fender Robert Cray Stratocaster Martin D18 Ambertone Martin 000-15sm
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#6
03-25-2020, 09:27 PM
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Roughly, it sounds like a grounding problem to me, but I’d have to know a lot more about the Aura system to venture more. On an electric, I’d be checking the grounding on the pickups.
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-Raf
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#7
03-25-2020, 09:39 PM
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Based on the way you phrase the question can we assume you bought new with Aura installed by Martin, thus you're looking for warranty service? Having eliminated a bad cord or amp problem, if it stops when you touch the board it sounds like a bad ground or "solder" somewhere, or just a "bad board" in general. I'd think Martin would rather a local certified tech look at it. A competent Martin certified tech should be able to track down the cause and quickly repair. (PS: be prepared that you may have to deal with Fishman not Martin on a warranty issue.)
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“The tapestry of life is more important than a single thread.” R. Daneel Olivaw in I. Asimov's Robots and Empire.
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#8
03-26-2020, 12:16 AM
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Sounds like a grounding issue. If I remember correctly the Aura is based around a Matrix under saddle pickup element. If the shielding coating on the pickup gets scratched or damaged it will cause a loud hum.
Pull out the saddle and check the state of the pickup underneath - it doesn’t have to be a major scratch for it to be a problem, just through the shielding to the metal underneath. If the element is undamaged then the grounding issue is elsewhere - start by checking that the wiring on the output jack is whole; the ground wire might have come loose.
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Gibson ES-335 Studio 2016; Furch OM34sr 2015; Fender MiJ Geddy Lee Jazz bass, 2009; Taylor 414CE 2005; Guild D35 NT 1976; Fender MIM Classic 60s Tele 2008; Fender US Standard Strat 1992; G&L ASAT classic hollowbody 2005; Ibanez RG350MDX 2010(?); Ibanez Musician fretless, 1980s; Seymour Duncan Tube 84-40; Vox AC4TV; Ex-pat Brit in Sweden
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#9
03-26-2020, 05:26 AM
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There is no one guitar cord that works with everything. I've had cords that worked great and thought the same thing until I had a ground hum on my acoustic once. I went through the logical list and found the "good" cord did not work on this particular guitar. Guess what, it was a Martin with aura too.Try a Mogami guitar cord.
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#10
03-26-2020, 05:35 AM
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Quote:
Next I would check the connector between the UST and the preamp PCB. I don't know what the latest ones use but it has been screw connectors in the past. The ground screw (no harm in tightening both) may be loose.
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jf45ir Free DIY Acoustic Guitar IR Generator .wav file, 30 seconds, pickup left, mic right, open position strumming best...send to direct email below I'll send you 100/0, 75/25, 50/50 & 0/100 IR/Bypass IRs IR Demo, read the description too: https://youtu.be/SELEE4yugjE My duo's website and my email... [email protected] Jon Fields
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#11
03-26-2020, 06:23 AM
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if you can touch the endpin jack and the hum goes away, that's a ground loop.
Try different outlets in your house. Try to float the ground on your amp by using a three prong to two prong adapter for the outlet. If you take it to another location, chances are, it wont hum at all. I've been down this road a few times, it's frustrating...
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