Hi all, I've recently purchased an Apex large diaphram condensor mic
and have bee powering it with a cheap Art tube pre. I went ahead and
tried to swap out the Art's TL702 opamps in favor of Burr Brown
2604s... now the thing won't work (naturally !) Not to worry... it was
only $100.
Thing is I don't necessairly want to replace it with another low
quality pre or even a small mixer (you know the ones) to get phantom
power and make the connection to my computer's 24 bit soundblaster card
(600 ohm line level).
What I do have is an older Tascam 244 4-track recorder that would seem
to have beter qualiy channel strips but does not support XLR or phantom
power. It has only unballanced 1/4" inputs.
My Question is would it be feasable to construct and install at least
one XLR input in the Tascam that will give me mic pwr and impedance
matching to where ever it might patch in to the existing input?

How might such a circuit lay out ?

Oh and Phase reversal feature for the condensor mic might be handy.

I can salvage parts from the dead Art pre.

Anyone care to make suggestions ?

"Savy" wrote ...
Hi all, I've recently purchased an Apex large diaphram condensor mic
and have bee powering it with a cheap Art tube pre. I went ahead and
tried to swap out the Art's TL702 opamps in favor of Burr Brown
2604s... now the thing won't work (naturally !) Not to worry... it was
only $100.
Thing is I don't necessairly want to replace it with another low
quality pre or even a small mixer (you know the ones) to get phantom
power and make the connection to my computer's 24 bit soundblaster card
(600 ohm line level).
What I do have is an older Tascam 244 4-track recorder that would seem
to have beter qualiy channel strips but does not support XLR or phantom
power. It has only unballanced 1/4" inputs.
My Question is would it be feasable to construct and install at least
one XLR input in the Tascam that will give me mic pwr and impedance
matching to where ever it might patch in to the existing input?

How might such a circuit lay out ?

Oh and Phase reversal feature for the condensor mic might be handy.

I can salvage parts from the dead Art pre.

Anyone care to make suggestions ?

www.jensen-transformers.com seems to be offline at the moment, but
assuming they haven't gone out of business, the standard mic input
circuitry will be shown in this circuit when it is accessible again...
http://www.jensen-transformers.com/as/as016.pdf

Savy wrote:

My Question is would it be feasable to construct and install
at least one XLR input in the Tascam that will give me mic pwr

Possible yes, but wise, no.

and impedance
matching to where ever it might patch in to the existing input?

How might such a circuit lay out ?

Oh and Phase reversal feature for the condensor mic might be handy.

I can salvage parts from the dead Art pre.

What makes you think it is dead?

Anyone care to make suggestions ?

There is a diy kit out there, a stereo mic pre designed by Phil Allison,
pcb is available and parts are not exotic. From reading about it on that
site it seems to be a sensible design.


Kind regards

Peter Larsen

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* My site is at: http://www.muyiovatki.dk *
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Thanks Richard and Peter.Mostly for not remarking on the fact that I
already killed one pre-amp !
actually... when I first opened the case and looked in...it broke !
You know?
I am learning... all is good.
cheers, savy