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Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1160 on: December 11, 2016, 10:37:12 AM »
All three can be both type.

Cheers, I now see that it's 2 x 2 positions and 1 x 3 position.....makes sense :)


Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1161 on: December 17, 2016, 02:51:46 PM »
Regarding the PSU in a 230V country, am I correct in assuming that I can use this part (Hammond 186C20) for the 20VAC by connecting pins 2&3 (for 230V) and pins 5&8 to the PCB  AC in 20V?  :P

http://www.mouser.de/ProductDetail/Hammond-Manufacturing/186C20/?qs=sGAEpiMZZMvwUzoUXIIvyQPvPmwnNFGyFP5siSHDz8Q%3d

Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1162 on: December 21, 2016, 08:12:25 AM »
Still hoping for a bit of help here.  I've complete my build and I'm having some issues at calibration.
For a start I measured the PSU, mic  not connected, and I get the following values:

Heater = 22VAC
AC In 210 = 270VAC

B+ = 227 DC
H- = -17.77
-----------

Mic plugged in, no tube:
B+ = 249
H- = -17.66

0.9 Ohm  between the mic body and the chassis of the PSU
---------------

Right after measuring my PSU gave out.  It kept blowing fuses and the last fuse I put in I could smell a bit of electrical burn.
I took out the PCB and could see that D1, the 15 V 5W Zener diode  has burnt out.
What could the reason for this be? 

Cheers,
Dennis






Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1163 on: December 23, 2016, 02:53:10 PM »
Anyone?   :-X

3nity

Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1164 on: December 27, 2016, 12:36:11 PM »
hi guys im slowly getting into this project!
I was wondering if this transformer would work for psu!
http://www.antekinc.com/as-05t240-50va-240v-transformer/
Life is a path, death the destination.

wave

Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1165 on: January 03, 2017, 11:13:20 PM »
Anyone?   :-X
Was your diode installed correctly?
You need the load of the tube to get your voltages to sit better.
Can you post a pic of your PSU wiring?

Dave

wave

Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1166 on: January 03, 2017, 11:14:29 PM »
hi guys im slowly getting into this project!
I was wondering if this transformer would work for psu!
http://www.antekinc.com/as-05t240-50va-240v-transformer/

This will work but it's a bit overkill. Any reason you are looking at this transformer?

Dave

3nity

Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1167 on: January 04, 2017, 06:27:30 PM »
Hi wave,
I just dont wanna have 2 transfos inside the psu.
also maybe i build a second one!

Life is a path, death the destination.

Kraume

Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1168 on: January 12, 2017, 10:01:36 AM »
So i just ordered everything and be very excited to start soon with this new project.

There is just one thing i'm wondering about: The Mouser Boom holds a 0.3A fuse. The first Page mentions  0.1A and 0.2A. What do i need in Europe using this transformer. http://www.mouser.de/Search/ProductDetail.aspx?R=FS20-300virtualkey55310000virtualkey553-FS20-300

Thx and Greets
Lars


TLRT

Re: Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« Reply #1169 on: January 14, 2017, 05:08:41 AM »
I'm using 0,315A fuses without any issues in my builds

So i just ordered everything and be very excited to start soon with this new project.

There is just one thing i'm wondering about: The Mouser Boom holds a 0.3A fuse. The first Page mentions  0.1A and 0.2A. What do i need in Europe using this transformer. http://www.mouser.de/Search/ProductDetail.aspx?R=FS20-300virtualkey55310000virtualkey553-FS20-300

Thx and Greets
Lars