Hi,
I've been analysing some parts of the Neve 1073 circuit over the weekend.
Now I have two questions about the Presence circuit, and the inductors that are used there.
(1) Why are there 2 seperate inductors? The T1530 is tapped already to
make different L values available. Why not just add another tap
instead of using the separate 200mH choke?
(2) For the lower frequency bands, L's _and_ C's are switched.
This results in a fairly constant Q for the different (lower)
frequency bands. On the upper bands, however, only the C's
are switched, and the inductance is left constant. This results
in an increasing Q with increasing center frequency.
Why have they chosen this behaviour? (Without full parametric
control, you always have to choose - so I'm basically asking
about the musical background for such a decision.)
JH.
I've been analysing some parts of the Neve 1073 circuit over the weekend.
Now I have two questions about the Presence circuit, and the inductors that are used there.
(1) Why are there 2 seperate inductors? The T1530 is tapped already to
make different L values available. Why not just add another tap
instead of using the separate 200mH choke?
(2) For the lower frequency bands, L's _and_ C's are switched.
This results in a fairly constant Q for the different (lower)
frequency bands. On the upper bands, however, only the C's
are switched, and the inductance is left constant. This results
in an increasing Q with increasing center frequency.
Why have they chosen this behaviour? (Without full parametric
control, you always have to choose - so I'm basically asking
about the musical background for such a decision.)
JH.