[Arny Krueger]

"Eeyore" wrote in
message
Arny Krueger wrote:

"Scott Dorsey" wrote in
Eeyore wrote:

Good Lord. By chance I came across a bag of ancient
LM301s in metal can the other day. Amazing what's
lurking in odd corners.

The scary thing is that Studer used the 301s in a bunch
of consoles and actually managed to make them sound
good. I'd never have believed it if I hadn't heard it
for myself.

All things considered that drives another nail in the
coffin of the theory that slew rate always matters.

Part of the secret is to never put more
than 20dB of gain on any one stage, it seems.

This part has only 1 MHz GBW. That means that a stage
with 40 dB gain may start rolling off with -3B @ 10 KHz.

Well ... the very popular and 'designed for audio' TL07X
series only has 3 MHz GBP !

The difference between -3dB @ 10 KHz and -3 dB at 30 KHz is very audible.

10MHz seems to be more the norm for more modern audio parts.

That pushes the 40 dB gain -3 dB point up to 100 KHz, which is gives
adequate margins.

It's even arguable whether a -3 dB point above 100 KHz is a bug or a
feature!