Re: [BUILD] NU FEDERAL AM-864 PCB OFFICIAL BUILD & HELP THREAD
« Reply #180 on: February 15, 2019, 10:19:34 PM »
So, it works beautifully with the 12au7’s in it. When I plugged it up initially I only had output connected and there was some hum, and my heart sank. As soon as I connected a balanced input load, the hum disappeared. The unit is respectably quiet, and seems to compress as it should. Cranking the output gives a nice gritty overdrive too.
The client is very happy!

For anybody who is interested in running this unit with the 12AU7 tubes (as a closer match to the original Federals 6SN7GT) with correct heater voltages, the mod is very simple! Just put a jumper wire from each terminal of the 12au7/12ax7 heater terminal block (this ties pins 4 and 5 together), then solder one leg of the heater supply directly to the pcb pad for pin 5, and the other to pin 9. A 12ax7 will provide too much gain running this way I think, so try the 12au7.
« Last Edit: February 16, 2019, 05:12:43 AM by fiat_cc »


Re: [BUILD] NU FEDERAL AM-864 PCB OFFICIAL BUILD & HELP THREAD
« Reply #181 on: February 16, 2019, 05:36:03 AM »
Completed unit in last stages of bench test and calibration.

Re: [BUILD] NU FEDERAL AM-864 PCB OFFICIAL BUILD & HELP THREAD
« Reply #182 on: February 16, 2019, 05:39:43 AM »
Clients are very happy with the unit. They’ve spent the day tracking, and mixing using the unit, and have had many nice things to say about it!

bernbrue

Re: [BUILD] NU FEDERAL AM-864 PCB OFFICIAL BUILD & HELP THREAD
« Reply #183 on: February 16, 2019, 06:09:38 AM »
Congratulations, Reuben. The unit looks great! Sometimes troubleshooting can be hard, but when everything is working in the end, it makes me happy as well.  Go on!
Bernd

Re: [BUILD] NU FEDERAL AM-864 PCB OFFICIAL BUILD & HELP THREAD
« Reply #184 on: February 16, 2019, 06:23:09 AM »
Congratulations, Reuben. The unit looks great! Sometimes troubleshooting can be hard, but when everything is working in the end, it makes me happy as well.  Go on!
Bernd

Thanks Bernd. It’s been a process, no doubt, but a good outcome for all concerned.

It’s an interesting unit. The client described it as quite transparent at some settings, when tracking guitars etc, and said you more ‘feel’ it than hear it. Then at other settings, it can give that really driven , ‘slammed’  vintage sound. A cool unit for sure.
« Last Edit: February 16, 2019, 09:07:41 AM by fiat_cc »

Re: [BUILD] NU FEDERAL AM-864 PCB OFFICIAL BUILD & HELP THREAD
« Reply #185 on: February 28, 2019, 08:21:01 PM »
A quick question...
My client loves the unit. It’s quiet in operation, but he said it’s noisy when bypassed. Now, looking at the schematic, when bypassed, it is for all intents and purposes just shielded mic lead running from the back panel, to the board, then back again. Any ideas why this would be noisy?  I was considering connecting all pin 1 earth connections on the back of the xlrs to each other but not sure if that will help or worsen any ground loops.

hugo

Re: [BUILD] NU FEDERAL AM-864 PCB OFFICIAL BUILD & HELP THREAD
« Reply #186 on: March 01, 2019, 06:54:20 AM »
A quick question...
My client loves the unit. It’s quiet in operation, but he said it’s noisy when bypassed. Now, looking at the schematic, when bypassed, it is for all intents and purposes just shielded mic lead running from the back panel, to the board, then back again. Any ideas why this would be noisy?  I was considering connecting all pin 1 earth connections on the back of the xlrs to each other but not sure if that will help or worsen any ground loops.

https://www.rane.com/png/n110fig1b.png

Re: [BUILD] NU FEDERAL AM-864 PCB OFFICIAL BUILD & HELP THREAD
« Reply #187 on: March 05, 2019, 06:20:21 AM »
Client informed me he fixed the issue by properly seating the IEC connector...! 😂


 

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