On 30 Jul, wrote:
In article
,
wrote:


I recently changed the IC's in a Quad 306 power amplifier (TI's to
Burr-Browns) playing through some Quad 988s. My wife (not an
audiophile), walked in the room and immediately asked what had
changed... "it sounded more alive" was her comment.

Comment much as above. It is a common experience that what we hear
'changes' from one situation to another. Afraid that simply isn't a
basis for deciding *why* a 'change' was heard. Far too many other
possible causes or reasons which your simple anecdote fails to deal with.

BTW I just looked at my copy of the 306 diagram. If you are referring to
'IC1' (TLC271) then you might like to note that IIUC its role seems to be
to null the dc offset of the amp. The 2M2 resistor (r33) and 680nF cap (c3)
mean it only really does much around the 1 Hz region and below.

You loudspeakers (and wife) are remarkable if they can hear this. I'd also
be curious to know what recording you were playing that had something
audible at such low frequencies.

Of course, since you didn't give any sign of establishing that your 'test'
had any value, it could just be that you and or wife are simply mistaken.
It does happen, I'm afraid, even for the wifes of audio fanatics. :-)

Slainte,

Jim

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