dmp

Re: Vintage Tube & FET Microphone (D-U67 D-U87 D-U47FET D-M49 D-M269c)
« Reply #580 on: January 10, 2014, 03:24:14 PM »
Hi Poctop,
How did you choose the 0.32H choke for the 269 / 49 PSUs? I usually think of them being higher, 5-10H.


Re: Vintage Tube & FET Microphone (D-U67 D-U87 D-U47FET D-M49 D-M269c)
« Reply #581 on: January 10, 2014, 06:46:58 PM »
Hi Poctop,
How did you choose the 0.32H choke for the 269 / 49 PSUs? I usually think of them being higher, 5-10H.

1- Avaliability
2-Henry

2- DC current Max   : In General the higher inductance the lower DC Max, since i had in mind the psu to be solid with most tube configuration possible as
 even for other mics some are more energy-Vorous  Heater current than others.

3- Footprints

4-Price

So basically  A trade-Off on all those things,

Be noted that the 500mH form this series will work fine , but at a cetain point filtering a already clean DC output Voltage is pointless.
dont forget the RC filetering Stage also Work well on this,

here is a quote from
http://prorecordingworkshop.lefora.com/topic/11780711/Chokes-in-Neumann-PSU


the choke is actually optional on the 2469 passive psu
you can replace it with a 10 ohm Resistor , I never had the time to actually try it with and without and compare on my list tough, 
 
Hope this helps,
Best,
dAN,




wave

Re: Vintage Tube & FET Microphone (D-U67 D-U87 D-U47FET D-M49 D-M269c)
« Reply #583 on: January 14, 2014, 10:49:59 AM »
Dany WILL take over the world!

Re: Vintage Tube & FET Microphone (D-U67 D-U87 D-U47FET D-M49 D-M269c)
« Reply #584 on: January 14, 2014, 11:16:17 AM »
Dany WILL take over the world!

maybe not  ;)
do i have to be worried of  Austin Powers now  ;) and mini-me.

 ;D ;D ;D

wave

Re: Vintage Tube & FET Microphone (D-U67 D-U87 D-U47FET D-M49 D-M269c)
« Reply #585 on: January 14, 2014, 11:48:22 AM »
Maybe Pinky and the Brain

dribro

Re: Vintage Tube & FET Microphone (D-U67 D-U87 D-U47FET D-M49 D-M269c)
« Reply #586 on: January 14, 2014, 06:27:07 PM »
Hi Dan

Ordered 2 packs of u87 PCBs with correspondent styroflex's the 9th, got them today. Impressive!

Re: Vintage Tube & FET Microphone (D-U67 D-U87 D-U47FET D-M49 D-M269c)
« Reply #587 on: January 15, 2014, 09:55:18 AM »
Hi Dan

Ordered 2 packs of u87 PCBs with correspondent styroflex's the 9th, got them today. Impressive!

you are welcome, happy build,
BEst,
DAN


Re: Vintage Tube & FET Microphone (D-U67 D-U87 D-U47FET D-M49 D-M269c)
« Reply #589 on: January 24, 2014, 05:40:06 PM »
D-Elam 251E with True Pattern Switching on PSU , I had to terminate what I started,  

this was a very fun build.  Specially the Point to Point HZ bridge,  half PCb/half PTP for the Optimal Results and Maximum Fun

Enjoy,

more Info soon,









I needed to get rid of a pair of stamping siders with the aid of a metal cutter and a file  :P



















































































Best,  :)
DAN,











D-47FET    3 Railing system (AMI-IOaudio) microphone body type.
  i am working with Oliver to have the tube Cut , i am expecting a prototype soon, will see ehat happens.















Best,
DAN ,