"Trevor Wilson" wrote
in message
"Arny Krueger" wrote in message
...
"Trevor Wilson"
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"tony sayer" wrote in message
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In article , Trevor
Wilson scribeth
thus

"Arny Krueger" wrote in message
. ..
"Trevor Wilson"
wrote in message

**That would be a reasonable assumption. HK have
clearly put a lot of effort into building a quality
analogue section in that machine.

An ultimate quality analog section for a CD player -
a 5532, a few penny
resistors, and a couple of caps.

**No, but that is an adequate one. More crucially,
however, many cheap players use vastly inferior OP
amps. I've seen 4558 class OP used in many cheap
players. Cheap DVD players are guilty of this.
Further, correct implemented muting can make a big
difference. Cheap players use a transistor, whilst better quality
ones use relays. For the record: The HK uses a
transistor. Mine will soon have relays fitted. Trevor Wilson
A Relay!..A relay!!, All that contact resistance and
wrecktification!!!

**Points:

* Muting circuits are usually short to ground type
operation.

Addresses neither shortcoming of some relays.

* Decent, hermetically sealed, gold-on-silver relays are
not expensive.

But short-lived because the contact materials are way
too soft.

**Not IME, for the particular use mentioned. Murcury
wetted is better, but more expensive.


Distortion form such contacts is very difficult to
measure.

Distortion in transistor muting circuits is very
difficult to measure. Here's a challenge to Trevor - measure the
distortion of
your CD player and post the results.

**I can't measure the distortion in my CD player. The
levels are below the limits of my test equipment (Sound
Technology 1700B).

How about your measurements on a super-econo DVD player. Or, are $29 DVD
players too expensive or too hard to find for you to test?