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In Reply to: RE: A tale of two amplifiers. posted by mbnx01 on September 21, 2014 at 12:38:32
But how can you compare the quality of the parts from a top down photograph??
What brand of caps, transformers, circuit boards and even heat sinks are used? I don't know from the photos.
For sure the Parasound has MORE parts, which probably weighs in its favor if you consider value based on the number of parts you get for your money but probably weighs against it sonically.
That said, both probably fall short of true high end sound.
Follow Ups:
Does it get much simpler than this?
http://diyaudioprojects.com/Chip/LM3886_CA/LM3886_CA.htm
Isn't this an opamp? If so it is not so simple inside. Many transistor make up an opamp.
Does it get much simpler than this?
Yes, it does:
Heck, I'm a circuit moron.
Do you know your differential equations?
:)
One active device. Period.
Yes, similar KISS concept, but I believe the SIT amps are based on Field Effect Transistors (vs bipolar) which more closely mimic a triode.
Cool stuff, "Keep It Simple Stupid", or load it up with a ton of parts. ;-)
S tatic I nduction Transistors are similar to the VFETs employed by Sony and Yamaha in the 70s and found nowhere else. They are unlike other FETs or JFETs commonly used today. Nelson Pass found a supplier to custom fabricate a large batch.
SIT design
Scroll down a bit to see a huge pic of the board. While at first glace, it appears to use multiple active devices, count the legs! The two legged devices are Vishay power resistors used in the bias circuit. Other than all the caps used for the power supply, you can count the number of in circuit parts on your hands. :)
...and very pricey!
when you have to spend multiple hundred k$ to custom fabricate unobtainium output devices, it don't come cheap!
If my stats didn't require more ooomph, I'd be tempted.
Hybrid tube/mosfet. Sounds wonderful on Quads.
"We are all in God's hands... and God is a malign thug."
-Mark Twain
My NAT has a simple circuit and a sophisticated power supply. The main circuit is a tube for voltage gain, a tube for a driver and ONE big industrial MOSFET for the output stage (yes it's single ended). THat one big MOSFET is strapped to a very large heat sink. The power supply is sophisticated in that it uses active regulation even for the output stage (another identical industrial MOSFET on it's own huge heat sink), choke filtering (4 chokes!) and monster power transformers with and a lot of uF of capacitance.
The circuit though is super simple, direct coupled (no caps or transformers in the path) and no negative feedback.
Not quite as simple as a SIT from Pass but not too far away.
Croft gear gets knocked a lot for how it measures, not how it sounds. First Watt gear gets praise both for good sound and for good measurement (in conventional terms).
Observe, before you think. Think before you open your yap. Act on the basis of experience.
Might be a little underpowered for my speakers. But then again, the old Cyrus II integrated is almost the same power and seems to be fine, unless I really want to cut loose and crank the tunes (which seems rarer and rarer these days!). Just need more resolution at the power end of things (the table and speakers can deliver)...
Dman
Analog Junkie
Generally speaking, I'm in the less is more camp when it comes to audio.Kind of looks like a medical joke. The doctor gave me a pill. Luckily there are three other pills I can take to control the side effects. Point being that after a certain point - what the heck ARE you doing in there?
I think that's why I like tube amps so much.
Edits: 09/22/14
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