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In Reply to: RE: Class " A" Stereo Preamplifiers posted by ahendler on March 15, 2015 at 09:40:47
Thanks..I thought so. So it does seem to make sense that the headphone jack out on my preamps sounds "better" than that on a lot of the vintage receivers,integrated amps ALONG with dedicated Headphone amps that I have heard.
Edits: 03/15/15Follow Ups:
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When you say "vintage" receivers, do you mean 1960s and 70s? There was a lot of discovery going on in the mid-70s which didn't trickle down to most consumer oriented products until the late 70s, and not even then in many cases. Take crossover notch distortion for example, and copious amounts of negative feedback, etc. There were lots of products in the late 70s where these things continued to be ignored. For example, Pioneer receivers, Sony receivers. What awful sounding crap (comparatively speaking, for hifi). Remember how most stereo amps didn't sound good until they were pushed well beyond the first 1/2 watt?
So it should come as no surprise that many newer products sound better than most vintage products.
:)
"Remember how most stereo amps didn't sound good until they were pushed well beyond the first 1/2 watt?"
In other words the point when a Class AB amp transitioned from Class A operation into Class B?
I don't know. All I know is that many SS amps sounded better when they got out of their low-output operating range.Discovering some of the reasons for this has made newer amps sound better even at low levels.
:)
Edits: 03/18/15
If the headphone jack on the various integrated amps you're trying is driven from the speaker outputs with some padding, the amp is still likely operating in class A (just based on the small amount of power that headphones need).
There is some likelihood that your preamp with a headphone out may be a zero feedback design (FETs or otherwise), which would sound a lot different than traditional solid state components.
I don't know about preamps, but a lot of integrated amps usually just put a dropping resistor from the speaker outputs for a headphone jack.
I would imagine a preamp would sound better???
It's really hard to generalize. I can come up with scenarios where either one should take the edge.
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