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In Reply to: RE: Great job posted by airtime on July 03, 2017 at 07:07:30
Redemptions is a tremendous motivator ... I got involved in this thread when I felt something was being missed ... I started by reading the manual and realizing that B/H's Wyred was an active not passive preamp and that contributors were treating it as a passive with passive downsides as B/H used the wording of "Passive"
Reading the manual you will come to realize that Wyred poorly used the word "Passive" to actually mean no additional active gain ... can't blame everyone for being confused including B/H because of Wyred's misleading language
All active preamps are Class A with no negative feed back but Wyred took it much further ... they realized that someone may want to use both outputs at the same time and buffered them ... also they realized most modern systems have to much gain anyway and didn't need any additional gain so they made the preamp a "unity gain" type offering no additional gain in the preamp ...this allows the volume control to be turned up higher with less resistance in the circuit and improves transparency .. dynamics and headroom
B/H's STP SE pre comes with Wyred's stage one improvements ... from their site
Stage 1 Upgrade
Our available Stage 1 STP-SE upgrade features our discrete proprietary regulators along with 24 Vishay Z-Foil resistors, four premium inductors, four Schottkey diodes and an upgraded fuse. These enhancements which focus on the power supply and input/output buffer circuits present greater fidelity and definition.
If you noticed in my second post I said the biggest choke point in most preamps is the volume control pot ... well take a look at Wyred's stage 2 upgrade ... from their site
Stage 2 Upgrade
The Stage 2 upgrade, includes all of the above plus an upgraded IEC inlet, 48 Vishay Z-Foil resistors located in the resistor ladder volume control, 16 upgraded high frequency filter capacitors and a green OLED display. Direct attention to the signal path throughout the volume control and filtering circuit yields major enhancements to an already exceptional product.
"48 Vishay Z-Foil resistors located in the resistor ladder volume control"
Yes ... Redemption is a tremendous motivator
if you mean being cleared of sin, I have blessed you.
just remember when it is time to go, move away from the light, most people go towards the light, and they wind up back here.
All active preamps are Class A with no negative feed back...
Those which use op amps are most certainly not as they employ large quantities of NFB for linear operation.
I stand corrected ... sometimes I tend to paint the picture with to broad a stroke ... I should have said most premium preamp are class A with no negative feedback
I would not own a active preamp ... I built a very simple volume control based on Slagle Autoformers .. also I wouldn't own a Dac or 1 box Cd player with op amps in the analogue output either ...
My Arye D1ex has a class A no negative feedback Jfet based output
My experience with op amps in the CD/Dac output is under high current demand they can't keep up with the current called for and go into oscillation trying to keep the input and output in balance ... my belief is the brief oscillation creates a temporary distortion that is very short lived and presents itself as a screaming or shout-ness by the performer's at their peaks
Just my subjective observation ... I struggled with this shout-ness and screaming on the peaks with a number of player for a number of year s ... always blamed it on room acoustic issues that I couldn't seem to tame then I bought the Ayre ... problem solved
Maybe it's just me or the way I roll but I wouldn't use an active preamp (to much gain ) or a Player/Dac that employed op amps regardless of how high the quality of the op amps were including discrete type ... this works for me and I'm very happy not chasing all he screaming female performer's
To each his own but I do stand corrected on my "all" preamp rant
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