ponownie hehehe!!!

[Lt_Bri]

O jaki wzmacniaczyk chodzi? :)

 

Case No.2. A very famous name from the US, one of the world's top two or three, came in for service with a friend. He called me up and said I might like to come over, because if he told me what he saw inside I would not believe it. And he was right - I wouldn't have.

 

I went over and there it was about 35 kg of power amplification, cost in five figure numbers (eight figures in Italy). Of course, I was impressed two meters away, and could hardly wait to look inside. Well, I did. It is built totally symmetrically, so it was easy to compare channels. My friend said he had repaired it, and that the slow turn on circuit went out, indicating that he never had the need to touch the actual audio electronics.

 

To cut a long story short, one board had plenty of free space. Several rows of transistors, off hand, I'd say about 30 or so were missing. Not there! Yet, when you turn the amp on, it works with no problems. I inspected the places where the transistors were supposed to be but weren't and determined that nothing had ever been soldered on those places - they left the factory as blanks.

 

This implies that they were in fact not needed, that they were there to fill up the board and justify the stratospheric price. This trick I saw last in 1968, when I purchased an 8 transistor portable radio by a totally unknown manufacturer only to find that three transistors were soldered alongside the board, doing absolutely nothing else but justifying the "8 Transistor" tag. That was an unknown Hong Kong manufacturer, but this was a whole new ball game, here we were talking about some really heavy money and a very, very famous name.

 

There was only one way to make sure, and that was to unsolder the same transistors on the opposing board. We did and nothing happened - the amp worked as usual, offering the same performance as before.

 

Conclusion - some guy went on a lunch break and forgot to solder in the do- nothing-but-impress-the-sucker transistors. Since they do nothing, the board passed all quality control tests, and the amp was in fact in perfect working order. In that sense, the customer was not hoodwinked - he paid for a working amp and he got a working amp. But it does make me wonder why would such a well respected company do something like that, use some expensive real estate inside the amp to mount dummy transistors (they probably all worked, but had absolutely no function), if not to additionally, for a meager sum (30 small signal transistors cost less than $1 regular retail, just imagine what they paid for them, with volume buying) try to impress the potential buyer and justify their hefty price tag? Sad practice.

[Lt_Bri]

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[Rafał]

fajne :-)))

[Lt_Bri]

po masie ( ok. 35kg ) można rzec że to Krell, ale oni chyba takiego ścierwa by nie zrobili...

[KotFilemon]

Przypomina to troche pewne plyty glowne do PC z koscmi 256KB pamieci cache. Czasem okazywalo sie, ze wlutowane kostki to tylko atrapy... :-)

To bylo chyba w czasach procesora 486.

 

pozdr.

[Ururam Tururam]

Wyjaśnienie równie dobrze może być niewinne: Ta sama płyta służyła w dwu modelach wzmacniaczy i omyłkowo jedna z wyższego trafiła do niższego. Wątpię, aby tak było, ale żeby to udowodnić należałoby otworzyc inny egzemparz i zobaczyć, ile ma tranzystorów na obu torach.

[Lt_Bri]

T y l k o c o t o z a w z m a c n i a c z ( ew. jakiej firmy )?

 

-->KotFilemon, nawet w 80386 takie kostki na wierzchu płyt były ( lata temu kupiłem za grosze taką płytę i kostki od niej wsadziłem do Gravis-a Ultrasound-a, po tym zabiegu minął żal że nie mam AWE32 :) )