Profex II Hum

Tommy Gibbons · Posted 7 Nov 2009 6:43 pm

I'm getting a low tone hum from my Profex II. What could be causing this? Electrical interference? I've only used it in my music room. But when I turn on the overhead light, I can here the switch being turned off & on.

I've moved the rack containing the ProFex away from the pickup end of the steel, no help!

???? Please respond with your idea...

Thanks, Tommy

Ray Montee · From: Portland, Oregon (deceased)

TOMMY you might wish to check your Email 'inbox'.These are my unscientific, non-polically correct, thot's on the subject. I have nothing factual to back up my thinking on this subject.

Tommy Gibbons · Posted 7 Nov 2009 11:03 pm **Hummmmm Update!**

With more testing, I shut down everything except the EVANS amp. Still humming. Anything I plug up or turn on or off in that room can be heard clicking and popping through the amp when switched. It is the only thing on and it still hums. All Fluorescents off. It must be a wiring issue within the 30 year old house. ?????

Thanks...
TommyG...

Tommy Wayne · From: Nevada, USA

or the amp

Jack Stoner · From: Kansas City, MO

If the Profex II is in a rack with other devices it could be a ground loop hum. However, if it's in the Evans amp with nothing plugged into the Evans amp then it isolates it to the amp.

If it's not the Evans amp, by itself, remove the profex II from the rack and plug it into the Evans amp, but do not plug anything into the input on the Profex II and see if you get any hum. If there is no hum, either something you are plugging into the Profex II or it's a ground loop hum caused by being in a rack with other devices.

If it's a ground loop hum, you will have to try and find out, one at a time, which device is doing it. Many times isolating (insulating) the devices from the mounting rails in a rack will cure it.

Tommy Gibbons · Posted 8 Nov 2009 9:02 am **Evans Amp Hum???**

Thanks tommy and Jack...if it's the amp, what the cure?

Tommy

Ray Montee · From: Portland, Oregon (deceased)

Have you checked your cords to the guitar, the ProFex
and the amp?

JUST IN CASE......they might be shorting out in some way.

Try another amp too! BEFORE you spend any large amount of monies.

My Session 400 developed a situation something like you describe just before it shorted out on the DC side of the fuse and burned itself up. The amp became very sensitive to any electrical pulses or changes or whatever.

Jack Stoner · From: Kansas City, MO

If it's the amp, a 12 ga shotgun will take care of it. Laughing

Depends on the amp. Most of the Evans I've seen have separate preamp and power amp, and maybe it's the shielded audio cable between the preamp and power amp.

Paddy Long · From: Christchurch, New Zealand

Another thing to consider --- I got a lot of hum from my Profex II and it turned out to be the wall-wart power supply for it! ... I unplugged it from the strip in the rack and moved it away from the power amp and this stopped the hum straight away !
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Tommy Gibbons · Posted 8 Nov 2009 5:14 pm **Here's my rack setup that hummmmmms!**

I removed the ProFex II wall wart from the power strip and the hum stopped...plugged into an extension cord hum still there. I'll send $25 to FORUM for fix to the problem using the existing equipment!

In the Rack:

1. ProFex II
2. Sabine RT-7000 Tuner
3. Phonic PPC 1100 Power Conditioner
4. Power strip (for ProFex wall wart only)

My Equipment:

1. Sho Bud LDG
2. George L Cable
3. Hilton Pedal
4. Rack as pictured
5. Evans SE=200 Amp

Thanks, Tommy

Tommy Shown · From: Denham Springs, La.

I had the same problem with my SGBB. I spent about a week trying fix the interference.except the one most simplest thing.A lamp that sitting on top of my rig,that was plugged in and turned on. I simply unplugged the lamp and it stopped. If you have your rack pluuged into a source where you have a lamp plugged in that could be your problem,Tommy.
Tommy Shown

Bill OConnor · From: Castle Rock, Washington, USA * R.I.P.

Try moving the Pro-Fex 11 away from your pickup if it is close . i had this happen . also don`t let your signal cords get wound up with electrical cords.

Jack Stoner · From: Kansas City, MO

I still bet on a ground loop hum caused by being in the rack with the other devices. Completely remove the Profex II from the rack and only use the Profex II and the amp, not the other devices in the rack and I'll bet the ground loop hum is gone.

This is a well known problem. You will have to do some experimenting and removing equipment from the rack to determine which device is causing the ground loop hum. Ultimately you may have to isolate everything in the rack from the mounting rails (at a minimum) using "humfrees" (brand name) nylon isolating tabs made just for this purpose. Last time I checked Musicians Friend was still selling these.

Tommy Gibbons · Posted 9 Nov 2009 11:04 am **Steel Hummin'**

This morning I removed all rack components inserted rubber insulating groumets in all mounting holes...same thing!

Checked each component separately, same hum!

I tried straight from the Hilton Pedal to the amp...no rack at all...still humming!

One last question, can an old (original) microphonic pickup make it hum?

But wait, it always hummed with my "new" GFI with George L pickup???

I just remembered, my old bass amps used to have a switch that changed the polarity, my Evans doesn't. And, that's the same hum I got until I toggled the polarity switch. How can I check that?

The hum is startin' to sound pretty good! I guess I'm getting used to it.

If you have any other suggestions, please postem'!!!

Thanks,

Tommy
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Mullen SD-10 RP, Evans SE-200, Line 6 POD XT, Peterson Flip Tuner, Geo. L Cable, Hilton Pedal, and D2F Covers for all.

Jack Stoner · From: Kansas City, MO

Then it's isolated to either the guitar, the Hilton Pedal or the Evans amp, or a bad guitar cord.

Start eliminating devices and see what happens. First thing disconnect the steel from the Hilton pedal and just connect the Hilton Pedal to the amp and see if it hums. If it does not then problem is the guitar or guitar cord you are using to connect to the Hilton Pedal.

If there is still hum with the Hilton pedal connected to the Amp, disconnect the Hilton and see if it still Hums. If it does the problem is isolated to the Evans Amp (or the AC power it's connected to).

Tommy Gibbons · Posted 9 Nov 2009 3:04 pm **Humming stops when I...**

The humming stops when I connect the cable to the amp, go to other end of cable and touch end of cable...

Did I just eliminate everything but the amp?

I tried 3 or 4 other outlets throughout the house...still hums.

Could it be my electrical system? All other household applicances and electronics are working fine.

Tommy.
_________________
Mullen SD-10 RP, Evans SE-200, Line 6 POD XT, Peterson Flip Tuner, Geo. L Cable, Hilton Pedal, and D2F Covers for all.

Jack Stoner · From: Kansas City, MO

Are you saying with NO cable connected to the amp, the amp hums? but if you connect a cable and then touch the other end of the cable it stops? And if that is the case what are you touching? the tip, the sleeve or both the tip and sleeve?

Tommy Gibbons · Posted 9 Nov 2009 3:38 pm **Hum**

Jack, I'm holding the cable in my left hand and toughing the TIP (plug) with my right hand. All cables are basically new, George L.

My previous amps have also hummed. Peavey Chorus 212, Nashville 400, now the Evans SE-200.

????

I feel like it's my house electrical system???

Tommy
_________________
Mullen SD-10 RP, Evans SE-200, Line 6 POD XT, Peterson Flip Tuner, Geo. L Cable, Hilton Pedal, and D2F Covers for all.

Tommy Gibbons · Posted 9 Nov 2009 6:22 pm **Hum Cont.**

Jack, it seems for the most part the hum is from the Evans Amp. With the BODY control at near zero and the depth OFF, there is almost no hum. As BODY and DEPTH are increased, so is low hum. I have always run both full open.

I guess...Live with it!

Thanks for all the time and suggestions.

Tommy

_________________
Mullen SD-10 RP, Evans SE-200, Line 6 POD XT, Peterson Flip Tuner, Geo. L Cable, Hilton Pedal, and D2F Covers for all.

Paddy Long · From: Christchurch, New Zealand

Tommy I guess if you take your rig out on a gig and it doesn't hum then your house wiring is the culprit !!
_________________
14'Zumsteel Hybrid D10 9+9
08'Zumsteel Hybrid D10 9+9
94' Franklin Stereo D10 9+8
Telonics, Peterson, Steelers Choice, Benado, Lexicon, Red Dirt Cases.

Jack Stoner · From: Kansas City, MO

My poor memory is coming back to me. I had an Evans SE-200 (had the Emminence Delta Lite Speaker) at one time, bought new. It had some low level hum and it was sent back to Evans since it was new and still in warranty. It turned out the problem was the power amplifier "idle" Voltage setting.

Disconnect the audio cable from the preamp, at the power amp input. Then power on and see if you have hum. If you do it's probably the power amplifier idle voltage setting like I had.

GaryL · From: Medina, OH USA

I had the same problem when I plugged into the front input of my amps. I removed the equalization from the Profex programs and the hum stopped.

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