Phase shift itself when reactivity is driven does not create distortions; what does, non-linear output impedance of the thingy that drives.
Speaking of measurements, what may be observed, a phase angle between input and output signals. For better visibility the load may be plain resistive. And again, let me repeat myself: single-ended phase inter-modulation may be inaudible, when it mimics Doppler effect. Otherwise it sounds nasty. Long time ago I thought that it may be used for guitar effects. Nope! It sounds nasty when is non-linear and significant; I tried it with bass guitar thinking of aggressive sound. Gave up.
Speaking of measurements, what may be observed, a phase angle between input and output signals. For better visibility the load may be plain resistive. And again, let me repeat myself: single-ended phase inter-modulation may be inaudible, when it mimics Doppler effect. Otherwise it sounds nasty. Long time ago I thought that it may be used for guitar effects. Nope! It sounds nasty when is non-linear and significant; I tried it with bass guitar thinking of aggressive sound. Gave up.
Hmmm,
What would make a good video drop in replacment for a
TL0072CP ?
I've heard of some folks making a whole board that replaces
the op amp itself.
Wondering how much of an improvement it would make?
Funny thing, on a Joe Cursio tube dac that I have, a buddy of mine was
telling me to upgrade all the audio opamps with video op amps,
that the whole thing would better.
Problem is Joe scratched off all the nomenclature on his op amps
and offers upgrades though his web site.
I'm thinking the upgrades would be less expensive buying through
digikey or mouser, or someone else.
Sync
What would make a good video drop in replacment for a
TL0072CP ?
I've heard of some folks making a whole board that replaces
the op amp itself.
Wondering how much of an improvement it would make?
Funny thing, on a Joe Cursio tube dac that I have, a buddy of mine was
telling me to upgrade all the audio opamps with video op amps,
that the whole thing would better.
Problem is Joe scratched off all the nomenclature on his op amps
and offers upgrades though his web site.
I'm thinking the upgrades would be less expensive buying through
digikey or mouser, or someone else.
Sync
PMA said:
Yes Pavel, AD844 is an great opamp (I'm using it as well)...but it has one big flaw...it's out of production, so availability, even for diy purpose, in future is questionable.
dimitri said:
I'm using AD844 as I/V converter (open loop) + it's buffer...and it does sound pretty good as long as the load is light (TVC S&B TX102 MkIII in my case)
john curl said:
Well, I'm placing my bet too on AD825...as error opamp in hybrid super-shunt regulator. One question John...is that Plashe current mirror differential as a load for folded cascade in simplified AD825 schematic?
In an audio preamp
Why is super high bandwidth , OLG BW and SR more important than low 1/f voltage noise, distortion and DC accuracy?
What is the noise corner freq for a jfet input video amp?
The typical audio source is BW limited anyway so slew rate is not that important> how much gain end-end do we need.... Av=2? Some folks use an attenuator for a preamp.
Compare your video op-amp design to an OP37(OP27, Av<2) for an audio benchmark?
Why is super high bandwidth , OLG BW and SR more important than low 1/f voltage noise, distortion and DC accuracy?
What is the noise corner freq for a jfet input video amp?
The typical audio source is BW limited anyway so slew rate is not that important> how much gain end-end do we need.... Av=2? Some folks use an attenuator for a preamp.
Compare your video op-amp design to an OP37(OP27, Av<2) for an audio benchmark?
If you go back a few thousand posts you start to get the ideas here. Simply put the traditional measurements don't indicate audio quality which is the reason for this. If they did then we wouldn't be exploring these ideas. If you are happy with traditional solutions its hard to beat a mid '80s Japanese integrated amp. No distortion, perfect RIAA and flawless performance (and to many unpleasant sound).
1audio said:
haha\ Jap integrated amp
OK I'm all for new stuff, but I still think my Q shouldn't be dismissed by simplification/comparing to mid 80's designs. BTW I think the primary reasons for "unpleasant sounds" are due to those haphazard class AB poweramps and mostly the evil Sanyo solutions.
Are there any technical goals or defined new topology for a preamp?
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