The official G9 help thread

[Stagefright13]

The transformers hum or does the audio hum?

BTW here is the G9 in action:

http://www.stagefrightrecords.com/Mike.mp3

It was performed by Mike Masse. http://mikemasse.com/

Samples are always good. Drip LA2 2.0 also in there...

 

[Godders]

Yeah, it's the transformers themselves that buzz, momentarily.

Nice sounding sample! :thumb:

Cheers

Nick

 

[Stagefright13]

I wouldn't worry about it then personally. I had a bad power switch. And thanks the G9 is very silky

 

[Godders]

Cool, thanks.

Cheers

Nick

 

[matta]

Nick,

Awesome to see you are on G9 #2! I'm finally getting together fund to build my own after I sold you the last one, which Cannikin sold to me... go figure! Quite excited about it, hope to be done in Feb (waiting on parts and what not).

Stagefright, RE the transfomers I'm considering having a SINGLE torrid wound with multiple taps, instead of 2 seperate transformers that most are using, it will look neater.

Cheers

Matt

 

[Stagefright13]

Yeah a single transformer would be so much neater! Just make sure ya hook it up right. I see you get custom wound ones. Nice job! I may be on G9 #2 myself. Altho I need more preamps like I need a hole in the head. I have 2 NYD Mila's in the build process right now. One as a Christmas present for my son. Trying to hurry on it tho cause he frequently comes over early to exchange gifts.

What I really need is 4 more compressors...

 

[Godders]

I reckon you'll find it was worth the wait Matt. :thumb:

The G9 is my fave mic pre, every home should have one! :green:

Cheers

Nick

 

[Stagefright13]

No Child should be born without one!! Matt will be in for a pleasant surprise.



quote="Godders"]I reckon you'll find it was worth the wait Matt. :thumb:

The G9 is my fave mic pre, every home should have one! :green:

Cheers

 

[rockinrudeingo]

Hi there !

i've just finished my G9! It was working right on from first power on, besides some oscillation (that now is solved) and the sound i just amazing.
Only one problem i can't solve at all is a 100 Hz Hum, not very loud but noticable, i've read through the whole thread, used the SEARCH-function like crazy, but never found any solution to this problem... this hum i'm speaking of is stable, with all pots GAIN and OUTPUT down it is there and doesn't change. I've tried allready
changing the TL 783,
changing the 78S12,
changing filtercaps to 220/400V,
moving around the Mains-TX (even out of the box didn't make any difference),
lifting ground. I've read that Wolferl and radiance had the same problem, but i never read any solution...
I've measured 294 V on Cap#14 and 246,4 V on Cap#15
or ist this just normal? thanks for you answers

Ingo

 

[gyraf]

Have you used screening cans for the transformers (in case of OEP)?

Try rotating your power transformer to find the spot with least hum induced into audio transformers, and lock it there..

Jakob E.

 

[rockinrudeingo]

Hi Jakob,

thanks for your quick reply,
yes i used screening cans on all the OEPs and i rotated the transformers in every way i could think of, but the 100 Hz Hum doesn't change in any way.

By the way maybe you can see that theres something wrong?

best wishes Ingo

 

[analogical]

Happy Holidays,

I'd like to bump rockinrudeingo's comment. I myself am having the same hum issues. Might a mu-metal shield around the trannys help, as found in Jacob's original version?

 

[Godders]

What about grounding? Are all your XLR pin 1s wired to star ground?

I posted some pics a few pages back of how I grounded my (quiet) G9.

Cheers

Nick

 

[rockinrudeingo]

Hi Godders,
i don't think it's a grounding issue, cos it's there even if i lift ground completely, anyway heres my grounding, i know it's hard to see, but there's the green/yellow-wire coming from the IEC-Inlet to pin 1 on the XLR-F from there a black wire to chassis ground and one to pin 1 XLR-F (channel 2) from there a black wire to pin 1 XLR-M (channel 2) and one from pin 1 XLR-F (channel 1) to pin 1 XLR-M (Channel 1). From the XLR-F 's ground goes to Mainboard. the XLR-M (output) don't go on the board yust shielding the wire...

thanks ev'ryone
tschau Ingo

 

[Axelerator]

after finishing my studium i now have some lucky time to spent
in Diy again!
-just want to ask if it would be possible to do a only stereo version
of the G9 just for stereo tracking&colouring as i do no microphone works
and just 2 knobs would be more nice then handling 4...
so if i use all L/R matched components (means expensive stereo pot ,
I know ) is there a chance to get the levels matched also ?

 

[gec]

Hi, I tried to use the G9 like buss insert on master in a DAW, but I'm having the same problem Radiance stated here: a roll off on bass frequencies
I've used OEPs for in & out, I wonder if changing Oep for Lundahl will solve this problem. I'm using it with Apogee DA&AD 16X
Thanks, Gec

 

[steppenwolf]

Hi Guys!
I'm thinking about building a G9. I already have an G7 mic and I'm VERY happy with it!
I'm just wondering if there will be any problems when connectin the G7 to the G9. Somewhere I read that the G9 has 1k input impedance but the G7 has 600Ohms...
I was told that the impedance of the mic pre should be much higher than the mic's impedance.

Any problems arising?
Thank you!
Stefan

 

[Stagefright13]

I have tried at least 10 different mics with my G9 and they all sound fine. If that means anything.

 

[steppenwolf]

Right, but most Mics I came across had impedances in the 200 Ohms region...
But wouldn't it be strange if Gyraf designed a mic and a pre that aren't compatible...
Somewhere I read that tubed mics like to see higher impedance loads.
And most pres are around 2k, right?
regards,
Stefan

 

[Stagefright13]

If it means anything my Cad M9 tube mic sounds fantastic with the G9...