[raul_ghiran]

Anything of ECC82/12AU7/5814 family produced before 1990

No, not at all

Thank you!

[raul_ghiran]

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]

Hi! Where have you made the front panels?

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

[biosynth]

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.

[gyraf]

You have most probably reversed to/from connections...

[biosynth]

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

[gyraf]

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.

[biosynth]

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. 

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