"Patrick Turner" <info@[EMAIL PROTECTED]
> wrote in message
news:48147A5D.1285D65F@[EMAIL PROTECTED]
>
>
> Trevor Wilson wrote:
>>
>> "Patrick Turner" <info@[EMAIL PROTECTED]
> wrote in message
>> news:4813556D.630051DD@[EMAIL PROTECTED]
>> >
>> >
>> >
>>
>> ****************************************************
>> > I never read what Trevor says about ME amps or the way transistors
are
>> > matched
>> > because its all empty sales talk and utter BS.
>> ****************************************************
>>
>> **Read the above very carefully. THIS is exactly what I am talking
about.
>> Every tech on the planet claims to know more about ME amplifiers than
>> Peter
>> Stein does. They WILL NOT fit critically matched devices, even when
>> specifically instructed to do so. They will always take the easy
(cheap)
>> way
>> out. As a consequence, the performance and reliability of the product
>> will
>> suffer. I know. I've seen the messes that have been created by second
>> rate
>> techs, who think they know it all.
>>
>> All the schematics in the world will not help, as long as techs think
>> they
>> know more than Peter does about his own product.
>>
>> I know, from my own experience, that some high Global NFB products
>> benefit
>> from the use of matched devices. In a product with no Global NFB, the
>> im****tance of matching becomes far more crucial.
>>
>> Trevor Wilson
>
> WHAT YOU SAY IS UTTER ****ING BS.
**No, it is not.
>
> Most techs do not assume they know more than Peter Stein.
**You do. Most of the ones I've met seem to. They think that they can
replace output devices in one of his amps with unmatched devices.
>
> In desperation because service manuals are not available, they
> may fit whatever transitors can be purchased which have as god as or
> better ratings
> than those chosen by PS.
>
> The claims you make about the im****tance of accurate hfe matching
> between both all
> PNP and NPN output or other transistors is a complete load of bollocks.
**Wrong.
>
> Good transistor amps function perfectly well with wider tolerances than
> you say because of the abundance of
> local and other NFB.
**"Good" is your term. not mine. I happen to feel that amplifiers which
use
lots of Golbal NFB are not "good". They are average.
Trevor Wilson
|
