[BUILD] NU FEDERAL AM-864 PCB OFFICIAL BUILD & HELP THREAD

[zayance]

Hehe, thanks nice logos , nice build and cool for the infos, much appreciated.

Have fun!

 

[nielsk]

Finally getting around to playing with the boards I bought, only to discover I seem to have not saved the docs then.
I can't log onto the google cloud and access them, is there a public account where I can get them?

 

[nielsk]

Anyone have a schematic and BOM they can just email to me?
I purchased these new from bernbrue...

Update:
Thanks for the responses, I am set!

 

[DonnieDarko]

Nice one! Looks great!

 

[Migs 31]

Hey folks,
Any of you would be kind enough to post the Schematic for this build as a PDF?
When I try to enter Google drive :
Schematic & BOM as PDF
https://drive.google.com/drive/folders/0B125JwaqoqLrbU5EVkRPZ0hYQ28?usp=sharing
I get no access to docs! I'm using Safari on older Mac maybe because of that?
Any PDF of the main schematic would be very nice of you all.
Thanks in advance.
M

 

[PermO]

This should help...

 

[Migs 31]

This should help...

Wow!
That was quick!
Thank you very much Sir, much appreciated.
I will post once the unit is finished and working.

Kind Regards
M

 

[HerbertR]

I have upgraded my compressor to improve the frequency response, reaction..... I swapped the Edcore input and output transformers and replaced them with UTM transformers. These two transformers now produce a much better sound. The treble range is much more clearly defined and the bass range is very linear down to below 40 Hertz. I have also tested a lot of tubes, such as ECC 83 against ECC 82 and 5749 tubes against different 6ba6 tubes. In my opinion, the "hotter" ECC83/12AX7 from JJ is the better choice in this setup and I preferred it to the more neutral ECC82/12AU7 in this circuit. The Mu tube JAN5749 also sounds more brilliant regarding to details, transients, much more musical... than all the 6BA6s tested, such as Philips... which sounded rounder and much less spectacular, more neutral. Since the UTM 2581 input transformer has a higher ratio of 600:15K than the used Edcor XSM600/10K, a higher h pad of 18dB attenuation was also necessary. The UTM3580 output transformer delivers a much better performance at 10K:600 than the OT Edcor XPP1 10K 600, especially in the highs. It fades out far too much above 10KHz. I also run the two 100nF DC decoupler caps in parallel with large 10nF Silver Mica caps. Maybe a controversal discussion about paralleling DC coupler caps. In my opinion, this gives a subjective cleaner detail in the highs.
You have to play around with the components a lot to get this compressor perfectly trimmed, be it the input level, the control bandwidth, or to get the noise in perfect balance. Every tube change has a very, very strong effect on the circuit. Simply brilliant now, a really classy toaster, thick, silky, from super gentle to brutal....

 

[Edward Brown]

Hello! I really want to get this build going, I see the boards are out of stock, I'm new on this forum so I'm hoping I'm reading this wrong and there is a source for pre printed boards. This will be the most complex build I've done, having a board already traced out would be so helpful

Also, is there a mono option for this? I see two different front plates available, but both are stereo. I also see some mono/stereo options on the parts list as well. I'll be making my own faceplate, so there will be some flexibility there. Until then, I'm reading everything I can on this amazing design!

Thanks in advance!