1073: How to add a line input without using a line trannie ?

I just want to add a line input to a 1073 clone.
I don't want to use a Neve line input trannie.

Probably an H Pad is ok, but maybe there is a better solution.
Anyone has a suggestion ?

Thanks.

Perhaps just add a DI circuit to the front end?
Update:
Joe's Active DI uses a OPA2604 and can run on any voltage from 12v to 48v. http://jlmaudio.com/JLMDI.htm

Hi Kato, well, i don't need a DI input, but a balanced line input.
As far as i can see the rack version of the current AMS-Neebe don't use a line trannie for the line input, but i didn't found a schematic, just a block diagram.

hmmmm. Here is an SSL 9K line in. Might find this useful as it is a transformerless line input.

http://i6.photobucket.com/albums/y236/pucho812/LineInputAmplifier9000.jpg

Try two 6k8 in serie with the input and a 1k over the primary, around -30dB and a fine frequency responce.
Avedis is selling the same kind of pad to use with his new class A pre

[quote author="pucho812"]hmmmm. Here is an SSL 9K line in. Might find this useful as it is a transformerless line input.
[/quote]

Wow. That's a complicated input stage. Anyone care to explain what's going on?

[quote author="Tekay"]Try two 6k8 in serie with the input and a 1k over the primary, around -30dB and a fine frequency responce.
Avedis is selling the same kind of pad to use with his new class A pre[/quote]

Tekay is right, (and thank you very much Tekay). This is the F.R. on
my 1290, line in, pad as above:

Chris v from Bluzzi's thread about building the 1073 mentioned
something about an easy way [ perhaps it is the same ] of adding
the line in , without the extra xfmr , but in the
" don't something for nothing " sense ,
without the xfmr you have to cut down gain that has been
developed instead of using it for S/N , but maybe one can overdrive the
input xfmr a little more that way , no one seems to complain about
any impedance change that way ?
and it is the cheapass way most lower level console manufacturers
have been going [ to attentuate the line level into the mic input and
then call it line in ]

but really what other than , passive resistence , xfmr or active circuit
to bring the line level into the micpre ?

Have you checked the "Wiring 31267 as 10468" option on the JLM audio page yet...?

http://www.jlmaudio.com/Neve%20transformer%20info.htm

It's at the bottom of the page

Hi,

Here is some info on what I consider to be the easiest solution - basing it on a Neve 1063. This had a single input (mic transformer) with a switch wired to give a gain of between +10 and -80dB. It really works too, I've built it and use it all the time.

Look here for the original schematic and a layout that TK did some time ago:

http://www.linear-recording.com.au/neve/Neve1063.jpg
http://www.linear-recording.com.au/neve/Neveswitch-1063.pdf

Cheers

Chris

You can build a line input stage based on low cost mic transformer with 1:1 ratio in zero-field configuration with inverting amplifier on 2 NPN transistors (the first works in the common emiter configuration, the second is emiter follower acting as a buffer. The load of the first one should be bootstraped by the follower to increase gain). With a resistor between the transformer and the input of the amp you can adjust amount of "transformer-sound" you'd like to get.

Thank you guys for your suggestions !!!
I think that the solution posted by chrisv is the simplest and I think i'll try that...