Neve Line-In Boards feeler

[Whoops]

you could buy the Carnhill if you want the classic package,

where do you get Carnhill stuff in the US?

came up with 78 bucks from AML which is in the UK,

Carnhill is using 80 Ni for their line inputs, which is a mistake IMHO,

these line in's are 50 Ni so saturation is not a problem for hot inputs,

BTW, not making any $$ off this, just providing another choice for DIY'ers,

Nice! How did you arrive at using 50% Ni for the line-ins?

M.

Hi CJ,
trying to learn,
could you explain the practical differences in using 80% Ni versus  50% Ni?

Also what would be the price of the transformer with the mu metal can?

thanks

 

[madriaanse]

A big stack of EZ-LN72 boards just arrived

Please shoot me an email if you're interested: 1290preamp (at) gmail (dot) com

EZ-LN72 BOM: https://s3.amazonaws.com/EZ1290/LN72BOM13.xls

For assembly instructions, this guide should get you 99% there: https://s3.amazonaws.com/EZ1290/assembly6.pdf The only difference is that the assembly guide is for the mic pre version of this project: http://www.groupdiy.com/index.php?topic=22828.0

Best,

Martin

 

[Rocinante]

I'm definitely down. Emailing you.
Oh and thanks Martin

 

[Rocinante]

Would it be too much to have a set following a console (for instance a Soundcraft Ghost) or replacing the master section in one? 

 

[kosi]

boards arrived !
thank you, Martin

 

[kosi]

First one is build and running perfectly !
I use  Marinair T 1442 as input and Carnhill for the out.
I plan to mount 4 of them in one 1HE, so I will use an outboard psu.

Makes me wonder: Do I need the Fader (Pot)  ?
I would like to drive the signal a bit hotter, but the manual says, that the attenuation occurs before the driver stage...
Could someone explain, how this works ?

thanks a bunch !

 

[Rocinante]

Any news on the cham labs line input transformers?

CJ?

 

[kosi]

cannot figure this out:
Do I have to watch the HFE values of the transistors ?

In the 1290, "the first transistor on the BA283NV pre amp section should be above 600, and the first transistor in the 284 pre amp section (3 BC184C's total) should be above 600 for best noise performance. " (quote from jrowell)

 

[Whoops]

cannot figure this out:
Do I have to watch the HFE values of the transistors ?

In the 1290, "the first transistor on the BA283NV pre amp section should be above 600, and the first transistor in the 284 pre amp section (3 BC184C's total) should be above 600 for best noise performance. " (quote from jrowell)

yes, the first one in each amp section. This circuit has 2 amplifier sections I think

The HFE should be above 600, the thing is that I cant see anywhere a mention to what should be the base current at which you are measuring the HFE.
Reading HFE at different base currents will give you different readings, so the 600 number alone doesn't tell you much.

 

[kosi]

I have my first pair up and running, every things good so far, but the gain levels are different.
CCW it starts with -5, 0, +5, +10, +15 etc
I like this, actually, but what am I missing ?

 

[Thro]

Are the gerbers for these boards available?