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jazzyvee
Senior Member
Username: jazzyvee

Post Number: 4215
Registered: 6-2002
Posted on Saturday, September 13, 2014 - 8:53 pm:   Edit Post

I just did a gig tonight and during the first number the stage guy came and changed my DI-out for a mic in front of my speaker cab.
After the gig I had a chat with our sound engineer and he said there is a buzz coming from the DI out on my pre-amp as there was no noise coming from the mic picking up my cab sound.

In actual fact during soundcheck we noticed that there was a distorted crunch coming out of the FOH system when I hit low notes but though it might have been the speakers but it transpires it was not.

Any idea's what needs to be done. For the time being I will swap it with my spare F1-x until I can with your help determine the nature of the problem.
edwin
Senior Member
Username: edwin

Post Number: 1831
Registered: 5-2002
Posted on Sunday, September 14, 2014 - 3:06 pm:   Edit Post

Cold solder joint?
terryc
Senior Member
Username: terryc

Post Number: 2249
Registered: 11-2004
Posted on Monday, September 15, 2014 - 6:16 am:   Edit Post

Could be a dry solder joint especially on the ground side(centre pin I gather). Did they change the cable or presume it was the socket itself?
Test it yourself by connecting the DI out to another amp and see if it buzzes, unless you already have done that! You will have to use a three pin DIN to 1/4" jack plug cable
jazzyvee
Senior Member
Username: jazzyvee

Post Number: 4221
Registered: 6-2002
Posted on Monday, September 15, 2014 - 6:58 am:   Edit Post

Good point Terry, I haven't done anything yet. I've swapped round the pre-amps and I think I will take the DI out into my mixer record it and listen back through my monitor speakers that way I don't need to mess round with trying to find a DIN to Jack cable.
terryc
Senior Member
Username: terryc

Post Number: 2250
Registered: 11-2004
Posted on Monday, September 15, 2014 - 8:00 am:   Edit Post

Yeah that would do the trick without resolving to a combo cable.
Pity you don't live nearer because I have every combination of cable under the sun(ex PA man you see)
Anyway keep us lot informed
jazzyvee
Senior Member
Username: jazzyvee

Post Number: 4352
Registered: 6-2002
Posted on Friday, December 19, 2014 - 3:08 pm:   Edit Post

I used both my F1-X's at a gig last friday and my regular sound engineer was on the desk and said both had good clean signals. So maybe the problem i referred to earlier was something else in the link between di and the mixer. So seems all is well with both my pre-amps. Ive been thinking of putting in new valves as i bought both used and ive had one about 8 years and who knows how long the valves have been in there.
keith_h
Senior Member
Username: keith_h

Post Number: 2123
Registered: 2-2005
Posted on Friday, December 19, 2014 - 7:09 pm:   Edit Post

Possibly a ground loop if the grounds on your equipment were not on the same electrical legs as the mixer. To get around it you can use an isolation transformer with a ground lift. You can also use the ground lift in the board if it has one.

Keith
sonicus
Senior Member
Username: sonicus

Post Number: 3824
Registered: 5-2009
Posted on Friday, December 19, 2014 - 9:06 pm:   Edit Post

That just might me right ! :-)
terryc
Senior Member
Username: terryc

Post Number: 2279
Registered: 11-2004
Posted on Monday, December 22, 2014 - 3:49 am:   Edit Post

Obviously it was his equipment at fault Jazzy and not yours!
gtrguy
Senior Member
Username: gtrguy

Post Number: 820
Registered: 9-2004
Posted on Monday, December 22, 2014 - 11:06 am:   Edit Post

Are you using the Alembic unit?

Sometimes the output jack switching internal contact gets dirty and can cause problems. You open the unit and fold a small bit of very fine sanpaper and pull it through the switch contact points. I gently open them first and then let them close on the sandpaper and pull it through a couple times.

You can see any dirt on the sandpaper, if there is any.

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