Just picked up an old Bruel & Kjaer type 2603 Mic Preamp for very short
money on Ebay. It may need some TLC. I bought it based on B & K's
reputation and the price. Does anyone know anything about this piece?
What can I expect sound wise? Is it a tube circuit and if so does it
use some long discontinued esoteric types?

Thanks,

Dan Fox

In article . com,
Daniel Fox wrote:
Just picked up an old Bruel & Kjaer type 2603 Mic Preamp for very short
money on Ebay. It may need some TLC. I bought it based on B & K's
reputation and the price. Does anyone know anything about this piece?
What can I expect sound wise? Is it a tube circuit and if so does it
use some long discontinued esoteric types?

It's solid state. And you'll notice that the input is not an XLR, but
is a 7-pin B&K connector. These are intended to be used with the B&K
measurement microphones which require 200V polarization rather than
standard phantom power.

I do not recall if these will work with the B&K tube mikes or not, but
they will definitely work with the 2065 follower. The B&K tube mikes
use the same connector as the solid state ones but also need 125V and
6.3V in addition to the 28V and 200V pins.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Scott Dorsey wrote:
It's solid state. And you'll notice that the input is not an XLR, but
is a 7-pin B&K connector. These are intended to be used with the B&K
measurement microphones which require 200V polarization rather than
standard phantom power.

I do not recall if these will work with the B&K tube mikes or not, but
they will definitely work with the 2065 follower. The B&K tube mikes
use the same connector as the solid state ones but also need 125V and
6.3V in addition to the 28V and 200V pins.
--scott

How feasible is it to convert this to a preamp with xlr ins and outs
with 48v phantom which can be used with typical mics?

Dan Fox

Daniel Fox wrote:
Scott Dorsey wrote:
It's solid state. And you'll notice that the input is not an XLR, but
is a 7-pin B&K connector. These are intended to be used with the B&K
measurement microphones which require 200V polarization rather than
standard phantom power.

I do not recall if these will work with the B&K tube mikes or not, but
they will definitely work with the 2065 follower. The B&K tube mikes
use the same connector as the solid state ones but also need 125V and
6.3V in addition to the 28V and 200V pins.

How feasible is it to convert this to a preamp with xlr ins and outs
with 48v phantom which can be used with typical mics?

It would be a lot more work than just building a preamp. Go find yourself
a used B&K measurement mike. Try Odin Metrology.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."