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Messages - flester

Pages: 1 [2] 3 4 ... 8
16
Amplifier Discussion / Re: Grounding techniques
« on: January 03, 2019, 03:08:28 PM »
Problem solved. I changed the mains adaptor supplying the pedal power supply. Noise now much at unacceptable level. Thanks again for your input. it stopped me going off om a fruitless and maybe expensive tangent! All for the price of four 9v batteries.

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17
Amplifier Discussion / Re: Grounding techniques
« on: January 03, 2019, 10:07:01 AM »
This is amp.  https://imgur.com/gallery/0DvnHiX

Works fine with this ps. not much noise using pedals on battery. https://imgur.com/gallery/49d8gK3

The noise comes in when I use this.
http://imgur.com/gallery/02LCUTt

Works well with a friend's  amp and



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18
Amplifier Discussion / Re: Grounding techniques
« on: January 02, 2019, 11:58:31 AM »
If you are having noise issues with the amplifier, I would look into why.

The power pack itself may be the issue, noise wise.

I agree, most likely it is the power pack that is causing the noise.  Sometimes this can be filtered by adding power caps inside the amp.
Thanks everyone. Power pack is not old but it was cheap so caveat emptor. I will look into using power filters though.

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19
Amplifier Discussion / Re: Grounding techniques
« on: January 01, 2019, 07:56:01 AM »
Ideally I want a wallwart with an earth connection if such a thing exists

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20
Amplifier Discussion / Re: Grounding techniques
« on: January 01, 2019, 07:12:59 AM »
OK let me clarify. In Ireland we have 240v AC mains with 3 pin plugs as used also in the UK. I am using a wallwart type power supply which has 3 prongs but the earth/ground pin is a plastic dummy, so the amp is not connected to 'earth'. My amp is simply a Kemo 40w audio power amp. There is slight hum which is OK, even with battery powered pedals but adding a pedal power supply gives unacceptable noise levels. The pedal supply works fine with a mains powered amp. When I connected the output negative to earth the noise went away ( using a mains plug). Is there another way to do this?

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21
Amplifier Discussion / Re: Grounding techniques
« on: December 31, 2018, 04:13:05 AM »
Take out your DMM and make sure what color wire is hot and neutral through the power cable. Then remove the cable and get a 3 prong type power cable. (Assuming you are in the US) Basically, you have answered the solution all ready in your post. Drill a hole in the chassis and attach a ground wire. It is really easy as you said in your post. Sometimes I find Black hot and other times white is hot...? Look at the function of the power cord in relation to your DMM. Adding a ground wire should solve your problem.

P.S. - Star grounding is something totally more advanced in my thinking in relation to just adding a simple ground wire.
I am using a power supply with no ground so that no mains voltage gets to my amp. Any suggestions on how to add a ground wire to cut noise?

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22
Preamps and Effects / Re: Strange pedal issue
« on: November 11, 2018, 06:02:11 AM »
Cool thanks. Cable not home made but may not have been intended for guitar. Jack on guitar comes out perpendicular to the top so I
prefer angled plug but works fine the other way. I was just about to open up pedals thinking thet were dead.

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23
Preamps and Effects / Re: Strange pedal issue
« on: November 10, 2018, 03:27:41 PM »
Yes the plug that won't work is TRS and it's the same with my other pedals. Explain?

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24
Amplifier Discussion / Re: 1x12" cabinet dimensions.
« on: November 08, 2018, 05:55:35 AM »
Thanks for that. Guitar cab at this stage bass? You never know

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25
Preamps and Effects / Re: Strange pedal issue
« on: November 06, 2018, 09:45:23 AM »
Good question! I will have a look - dunno why I didn't already.

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26
Preamps and Effects / Strange pedal issue
« on: November 06, 2018, 09:25:19 AM »
I have a guitar cable with angled plug on one end and straight on the other. My Boss DS1 pedal will only work with the angled one in the pedal and the straight into the guitar. The cable works both ways when it goes directly from guitar to amp.  Is that normal?

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27
Tubes and Hybrids / Re: Recommended Tube Amp kitd
« on: November 06, 2018, 09:17:41 AM »
Thanks. I will check out those. Building 1x12 cab first anyway. Various tube, ss and hybrid heads are available for a lot less that tube kits but wouldn't mind a trying a few heads with the cab.

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28
Amplifier Discussion / 1x12" cabinet dimensions.
« on: October 28, 2018, 07:05:56 PM »
I have a Celestion G12 P80 12" speaker and some pineboard. A  1X12 cab seems an obvious project. Any opinions on dimensions? I see some commercially available ones include  350x275x350(portable),  550x460x290 (Orange), 433 x 445 x 233 (Fender).
My joinery skills are reasonable

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29
Tubes and Hybrids / Recommended Tube Amp kitd
« on: October 08, 2018, 11:58:42 AM »
Feel like I'm ready to try a tube build from a kit. Any recommendations for a first timer (including "don't do it" or "don't ask here"). I am  thinking something simple on 240 v 50hz mains power.

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30
The Newcomer's Forum / Re: Centre Negative DC Jack
« on: September 21, 2018, 05:59:13 AM »
Heres what I came up with. The bundle of 6x AA rechargeables to the right of the pedal box has a centre -ve  lead supplying pedals, and a centre +ve  supplying the amp in the fudge tin. The Orange is my cab.  I guess I need reverse polarity protection for the amp and maybe the pedals. Can I use an LED for that or do I need another type of diode? I know battery life may be an issue but may be a proper FX power supply mat work better?

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No problem with the battery life over the last few weeks. Better than rechargeable PP3's.

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