Introducing: LINE2PRE Re-Preamp November 18, 2011 19:19 13 Comments

Hi there

What are the values for the resistors?

This one is for a 10K:150 transformer, right?

Would it be possible to use a 10K:600 transformer instead, and if yes, what should the values for the resistors be then?

Hi Anders, yes this is for the 10k:150 transformer. In fact, I’ve found that if you use that transformer you don’t actually need the H-pad after the transformer. Just terminate the transformer with a 150 Ohm resistor between the secondaries.

Yes, it’s possible to use a 10k:600, but then you’d definitely want the H-pad. Here’s a great place for calculating h-pad resistor values depending on the impedances and amount of attenuation you want: http://www.nu9n.com/tpad-calculator.html
You’ll want 600 ohm input and 150 ohm output impedance.

Cool! Thanks a bunch!

Will MONACOR DIB 110 be good for LINE2AMP ?
This is 47k:600 transformer for di boxes
It has only 2 pins on the input. Does it matter ?
here is the link
http://www.monacor-ost.com/catalogue-product.phtml?id=6231&Comp=0&Hier=1&MainKtg=155&SubKtg=611

cheers

The DIB 110 doesn’t look ideal: it’s designed for mic, instead of line level, and the steep step-down ratio will give you a really low output level.

OK thanks !
What about Monacor LTR-110 ?
http://www.monacor-ost.com/catalogue-product.phtml?id=2651&Comp=0&Hier=1&MainKtg=155&SubKtg=595
it is 1:1 though..

1:1 will work ok, but you might want some sort of h-pad after the transformer to pad the output signal.

thanks !!

Hi, It’s me again !
Two monacor transformers came to me (for stereo version)
I am counting the values for resistors for the H-pad.
Now my questions are:
- since my transformer is 1:1 then my H-pad should attenuate about 40db right?
- is the wattage of resistors important?

cheers milosh

Would it be possible to build one of these in the same box as a line2amp? That would be pretty sweet to be able to re-amp to instrument or line levels with one tool.

Phil, funny enough, that was the original idea for the LINE2AMP Rev C. I decided against it, however, because there’s really little difference between a good, low-impedance line signal like the LINE2AMP gives you and a mic signal such as the LINE2PRE would give you. They’re both balanced and low impedance, the difference between them is just a matter of the typical levels. A moderate line-level signal is a pretty loud mic signal, etc.

Ergo, you can actually patch the output of the LINE2AMP to a mic preamp, just be careful about how much volume you send it. I built in a pad to the LINE2PRE to drop the level, but you could just send less level to the box in the first place.

Td;dr— The LINE2AMP is more-or-less the same as the LINE2PRE, but without the pad and with a 1/4" output jack instead of XLR.

Hi Peterson,

I have your line2amp box and love it, I have usually used a JDI for revamping back through preamps. Would it be better if I put the line2amp before the JDI or just keep doing the same?

Hi Dan,

Great question. Putting the LINE2AMP before the JdI would not make much of a difference, except for the additional 12dB of attenuation you’ll get from the LINE2AMP. Since the JDI has a transformer, most of the functions of the LINE2AMP, such as isolating the grounds and attenuating the signal, will be taken care of by the JDI.