Re: The official G9 help thread
« Reply #2240 on: September 16, 2020, 10:53:31 AM »
Anything of ECC82/12AU7/5814 family produced before 1990

No, not at all

Thank you!


Re: The official G9 help thread
« Reply #2241 on: September 22, 2020, 09:17:44 AM »
Finished my second Unit.
For this build I use a red frontpanel and OEP transformer IN and OUT.
Could not make a comparison with the Lundahls but the bass DI sounds a bit different in my opinion.
Now I’ll take a build break :)

Hi! Where have you made the front panels?

TillM

Re: The official G9 help thread
« Reply #2242 on: September 22, 2020, 02:46:01 PM »
Hi! Where have you made the front panels?

I got this from Frank Röllen.
http://www.frontpanels.de


biosynth

Re: The official G9 help thread
« Reply #2243 on: October 02, 2020, 01:17:05 PM »
Hi!

I've auto oscillation at high gain so I make this mod:
08. Jan. 2007: If you run into problems with oscillation on the highest gain settings, try running the connections to/from the front panel High-Z jack connector "directly" from the relevant points on the PCB - by cutting the PCB traces, and running a length of shielded cable directly to/from the jack. See this image for reference!!
http://www.gyraf.dk/gy_pd/g9/G9-EDIT.GIF

Now I've no signal (a small hum with really low signal) on the two DI inputs, so I think my work is correct. I wonder if this mod is ok with REV1 pcb. Can someone can confirm?
I'm disappointed my preamp doesn't work anymore (In DI input only, It works with mics)  :-\ :-\ :-\

thanks a lot in advance.

« Last Edit: October 02, 2020, 01:26:31 PM by biosynth »

gyraf

Re: The official G9 help thread
« Reply #2244 on: October 02, 2020, 05:53:48 PM »
You have most probably reversed to/from connections...
..note to self: don't let Harman run your company..

biosynth

Re: The official G9 help thread
« Reply #2245 on: October 03, 2020, 08:12:12 AM »
Hi,
thanks for your quick answer. It was that, thanks a lot :)

But I scrupulously done your mod, so I think there is a mistake on the schematic. Could you verify?

Working with this color code (I think FROM and TO are to be swapped on the plug):
https://ibb.co/qNJVjy7
« Last Edit: October 03, 2020, 08:22:00 AM by biosynth »

gyraf

Re: The official G9 help thread
« Reply #2246 on: October 03, 2020, 10:12:28 AM »
The pic showing the edit still looks right to me - it might have been your actual jack connector that was mirrored? I've only (so far) come across connectors that work with the guiding pic as-is..

/Jakob E.
..note to self: don't let Harman run your company..

biosynth

Re: The official G9 help thread New
« Reply #2247 on: October 03, 2020, 01:42:49 PM »
it's an amphenol jack plug but other noname plugs are the same.
Only writing has to be swapped, not wiring.

All in all thanks a lot for putting your mighty preamp to the DIY world.  :-* :-* :-*
« Last Edit: October 03, 2020, 02:10:57 PM by biosynth »


 

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