Author Topic: EDEN WT800C hum  (Read 509 times)

Offline blockhd

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EDEN WT800C hum
« on: June 05, 2019, 02:33:31 PM »
Dear Edenites,

Let me introduce myself. I am Rok from Slovenia, Europe and i am an avid EDEN fan... I mean, who doesn't love EDEN amps?

During my career as a musician i have owned several EDEN products from Nemesis combos and cabs to Metro combo... But i have never owned an Eden bass head.

LAst week, i saw a really nice looking Eden WT800C in local classifieds and i bought it for 650$. Immediately upon returning home and plugging the speaker into amp at silent ambient of my living room, i noticed a slight hum comming out of speaker. It is independent of wether an instrument is plugged in or any preamp gain is applied.

This hum is the most pronounced when Master is at 0. When you open Master volume control to about 50%, hum almost completely disappears or is overpowered by actual hiss/white noise of amp itself... When speaker is plugged into one side L or R, hum is the loudest when PAN control is set completely to opposite channel. So if i plug speaker to left side and pan completely to right, hum is louder than if i pan completely to left or let it in the middle... Generally, hum is a little louder in Right side.

Do you have experience with similar situation and what could it be? Please see attached a sample of hum recorded with studio microphone -> Mic gain was set to max, in reality, hum is very faint, but loud enough to drive me crazy.

https://vocaroo.com/i/s0WihdSpcWMQ

I hope i have explained the hum adequately, if not please let me know and i will do my best to describe it further.

Thank you for your feedback.

Rok Barbo

Offline Rip Van Dan

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Re: EDEN WT800C hum
« Reply #1 on: June 05, 2019, 02:59:55 PM »
Hi Rok,

Welcome to the Garden!

First thing I would do would be to get some DeoxIT 5 (red label can) or a similar contact cleaner if it is not available in your countrly.  Then I would clean every 1/4" jack in your amp and make that part of your annual amp maintenance.

To clean them, spray a small amount directly into the jack, and then spray some on a 1/4" plug and move it in and out of that jack 10 to 15 times.  This will remove any oxidation or other crud that may get on these input/output contacts.

Pay particular attention to the jacks on the back of the amp that you don't use.  Since they don't have a cord being plugged in and pulled out, they tend to accumulate oxidation and crud on them first.  The reason this is important is that the signal path goes through virtually all of those jacks and it just takes one to start causing problems.  Dirty unused jacks are often the cause of the problem.

If you still have that annoying hum after cleaning it, come on back and let us know.  There are a number of electronic gurus on the forum including one of our moderators, Armin (Bassmann1968), who know these guys inside and out.  They'll be happy to help you diagnose it if the hum persists.

Dan
Rip Van Dan
Dan Gracia
'82 US-made Fender Jazz Bass with maple neck
5-string Rogue LX405 Pro (Surprisingly good "no-name" bass)
WT500/800 Highwayman (signature model)
D.N.S 410-8, Eden EX112 x2
Line6 G10s wireless
==
spares:
Eden RS400, GK BK250, BPX115 cab, acoustic B410 cab, Sunn Beta 202 (2x12)

Offline Bassmann1968

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Re: EDEN WT800C hum
« Reply #2 on: June 06, 2019, 04:12:30 AM »
Welcome to the Garden, Rok!

Dan said it all.
Armin

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No schematics available!!! Don't ask for it.
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WTP-Pre,1350,WTX260,WT300/400,WT1000,WTX1000N,NAV,WTDI
D112XLT,D210XST,D410XLT,D810RP,DNS410,DNS112

Offline blockhd

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Re: EDEN WT800C hum
« Reply #3 on: June 09, 2019, 01:44:50 PM »
Thanks Dan and Armin for your support and quick answers.

Cleaning the jacks as per Dan instruction didn't help - the hum perists.

I took a closer look at the amp -> I uncovered it and looked inside. First impression is that everything looks very nice, clean and tidy... However one detail caught my attention. There is an unconnected white cable hanging in there... Please see photo below.. There is also one yellow unconnected cable hanging, but the one looks like it was like that all the time. White however shows some signs of use inside connector so i believe it was connected somewhere at some point. Could this be the culprit behind my problem?



If this is not the problem, we need to start diagnosing :)

Thank you and have a nice evening!

Rok Barbo

 

Offline Bassmann1968

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Re: EDEN WT800C hum
« Reply #4 on: June 10, 2019, 12:55:37 PM »
Is this white cable coming from the transformer?
In which Country are you? Which voltage do you use?
Rock on!
Armin

PLEASE LIKE EDEN ON FACEBOOK!!!
No schematics available!!! Don't ask for it.
;)

WTP-Pre,1350,WTX260,WT300/400,WT1000,WTX1000N,NAV,WTDI
D112XLT,D210XST,D410XLT,D810RP,DNS410,DNS112

Offline blockhd

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Re: EDEN WT800C hum
« Reply #5 on: June 10, 2019, 01:46:07 PM »
I am in Slovenia, Europe. I am using 240V AC. Yes, the wire is coming from the transformer.

Offline Bassmann1968

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Re: EDEN WT800C hum
« Reply #6 on: June 11, 2019, 06:37:40 AM »
On the power supply board should be some connectors.
labbeled with 0V,100V, 120V etc.
Can you take a picture of those connectors or describe what is connected to them?
Armin

PLEASE LIKE EDEN ON FACEBOOK!!!
No schematics available!!! Don't ask for it.
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WTP-Pre,1350,WTX260,WT300/400,WT1000,WTX1000N,NAV,WTDI
D112XLT,D210XST,D410XLT,D810RP,DNS410,DNS112

Offline blockhd

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Re: EDEN WT800C hum
« Reply #7 on: June 11, 2019, 11:36:01 AM »
Idon't think there are any labels on cables or on lugs where cables are connected... Is it an option for you to do this through some kind of IM? Like Messenre, Skype, Google Hangouts? I can show you everything on camera.

Thanks,

Rok

Offline Bassmann1968

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Re: EDEN WT800C hum
« Reply #8 on: June 12, 2019, 01:42:38 AM »
You can find me on Facebook. Armin Basten.
Armin

PLEASE LIKE EDEN ON FACEBOOK!!!
No schematics available!!! Don't ask for it.
;)

WTP-Pre,1350,WTX260,WT300/400,WT1000,WTX1000N,NAV,WTDI
D112XLT,D210XST,D410XLT,D810RP,DNS410,DNS112

Offline blockhd

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Re: EDEN WT800C hum
« Reply #9 on: July 02, 2019, 02:29:23 PM »
Hello again!

Thanks to Armin, i was able to do a few diagnostics:

1. Check the amp section bias -> It was a little out of spec but i put it in spec
2. Rotated the transformer

So far, nothing helped, hum persists... If anyone has some additional ideas, please let me know :)

Have a nice day.

Rok Barbo

Offline Bassmann1968

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Re: EDEN WT800C hum
« Reply #10 on: July 03, 2019, 03:56:07 AM »
Hi Rok,
sorry, I had an accident yesterday and couldn't write back.
I did sent you further instruction.
The hum is very small and we might not get rid of it without proper work bench testing.
Rock on!
Armin

PLEASE LIKE EDEN ON FACEBOOK!!!
No schematics available!!! Don't ask for it.
;)

WTP-Pre,1350,WTX260,WT300/400,WT1000,WTX1000N,NAV,WTDI
D112XLT,D210XST,D410XLT,D810RP,DNS410,DNS112