🚀 go-pugleaf

"Trevor Wilson" <trevor@SPAMBLOCKrageaudio.com.au> wrote in
message news:42d41ed6@news.comindico.com.au
> "Arny Krueger" <arnyk@hotpop.com> wrote in message
> news:X4-dnZRDL_aHhknfRVn-tQ@comcast.com...
>> "robert casey" <wa2ise@ix.netcom.com> wrote in message
>>
news:xOUAe.21856$eM6.10366@newsread3.news.atl.earthlink.net
>>>>> it apart from cheap CD players. These include:
>>>>>    Proper relay muting.
>>>>
>>>>
>>>> Nothing magic about that. Just something mechanical to
>>>> break.
>>>>
>>> A relay avoids any possible effects of the unmuted
muting
>>> transistors causing distortion because of nonlinear
>> effects.
>>
>> But if there are no problems with distortion due to the
>> muting transistors, then the relay is futile.
>
> **IF that is the case, then yes. However, a relay avoids
the
> possibility entirely.

Well, until the contacts get dirty.

> Muting transistors cause measureable  problems in many
units.

Never saw the problem even though I've read people get
paranoid about it.

>Properly implemented relays cause no  problems. Ever

Until the contacts get dirty. I've experience that problem
with power amps.

>>>>>    Decent output stage, which does not include
>> primitive,
>>>>> 4558-style output ICs.

>>>> Nothing magic about that. Terevor, your phobia about
>> 4558s
>>>> isn't my problem.

>>> Some op-amps can have crossover distortion issues.

>> Yup in the late 60s and early 70s, but mostly not even
then.

>>> Don't  know about the 4558 specifically though.

>> I do. It's widely used in consumer and pro audio gear.

> **No. 4558 style chips have not been used in any decent
> equipment since before 1980.

OK, so all this fairly new  pro gear such as the power amp
for my NHT Pro A10s is indecent. Either that or it was made
before 1980 even though that  model came out just a few
years ago.

> Even pro audio equipment
> manufacturers stopped using them two decades ago. They
were
> resurrected by cheap Asian CD/DVD player manufacturers
awhile
> ago. Decent equipment eschews the use of them.

I run into 4558s every once in a while in all sorts of gear.
Just because Trevor is paranoid about them doesn't mean that
everybody is.

Yes, 4558s aren't the greatest op amp in the world, but they
are still being used to make quality new equipment.