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I never said it was nefarious

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In Reply to: RE: Obviously, but the inscriptions are gone as well posted by kentaja on December 18, 2024 at 07:31:00

I only said it was there and they do remove the origin and a part number actually the same way Tom Evans removes the markings on his products because according to him he also matches them in time consuming process. I don't see a difference here implied by Abe and E-Stat. Do you ?? The outcome is the same . You either buy from manufacturer or play a radio.
90% refusal rate is a joke and it is not sustainable in any manufacturing and modern active devices do not have such broad spread of parameters to justify that sort of selection.
They lost some of the database of the devices they used in older lines in power supply regulators. I read now and then of folks (mostly abroad) stuck with those monsters nobody wants to repair due to lack of replacement parts or the price quotes from the local dealers. I do have a fair amount of respect for Audio Research for their (mostly past) construction prowess and parts quality. It was exemplary, but it just didn't sound like it to me. Later gear I worked on (Ref75 SE ) is getting closer to McIntosh in assembly. Much less impressive.

Edits: 12/18/24

Follow Ups:

RE: I never said it was nefarious - kentaja 09:01:59 12/18/24 (2)
ARC removes the part numbers? And you know this how? Have you been to the factory and seen the process?

'90% refusal rate is a joke and it is not sustainable in any manufacturing and modern active devices do not have such broad spread of parameters to justify that sort of selection.'

Again you know this how? You have an understanding of ARC's engineering and tolerance criteria?

Yes you are indeed claiming ARC is behaving in a nefarious way. That they have some agenda to gouge their customers when it comes to replacement parts.

Easy enough to throw out unfounded accusations and make all kinds of assumption with little if any actual knowledge or data. The beauty of the internet I suppose!
- RE: I never said it was nefarious - Wojciech 09:50:31 12/18/24 (1)
  I serviced the ARC equipment and couldn't see the numbers behind the color stripes. Either way the effect is the same.
  Since you're so deep into subject please provide the types of fets used in Q1, Q2 ,Q3 Q4 positions on posted VT100 so I can exercise my right to repair the equipment I bought and paid for. I will be my own judge if the replacement I use are matched to the needed degree. Also since you're here give me the types of the pass transistors in the regulator circuit which are not subject of matching . I know they are selected because the circuits are marginal and require it in some but not all devices. I used Audio Research as an example of manufacturer who does protect some of the design aspects just like Tom Evans does and not to single it out like you suggest. Please do not tell nonsense of 90% refusal rate on modern production silicon devices from a reputable manufacturer on technical forum.
  
  Edits: 12/18/24
  - And example - Wojciech 10:08:38 12/18/24 (0)
    "A friend of mine was swapping tubes in his Audio Research Reference One preamp when he bent and broke one of the leads on an FET that has a heatsink very close to a tube so I contacted Kalvin at Audio Research for a replacement "Green White Brown" FET.
    What I received was a Green Green Brown FET in a mailer envelope. They charged $15 for the FET and another $15 to send it in the mailer envelope!
    Not to mention the whole parts process took 2 weeks from start to finish and I don't even have the correct "hand painted" part yet.
    Needless to say, Audio Research will not be getting any more of our hard earned money for their "hand painted" parts. Or any more components for that matter."
    
    With all due respect for ARC, the paint they use to "code" their components is of such quality that even lacquer thinner will barely break it down. But once it does finally clean away from the semiconductor the reveal is a heavily sanded component that is guaranteed to not expose its identity. The process of disguise must require meticulous sanding and an expert level of artistic painting. A level of personal attention unheard of in other companies products. I've never seen hand sanded and painted components in any Krell or Levinson piece. Slackers.

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