Re: PCB question



"M.J.P." wrote:


Or, if you really want to get knocked off your chair, a Marshall JCM 2000
DSL 401.

That NEEDS a translation expert to tell you, what the hell you are looking
at.

Show me one thing on that print relevent to the CIRCUIT OPERATION for that
freaking
amp!!!!!!!!!!!!!!


Just a suggestion, go back to school.
The world is not going to revolve around technology that
only some are comfortable with. MJP

WHY.

The authors of the CAD crap no nothing of the industry standards for vacuum tube practice.

The sand casters think what works in sand, works with tubes. Failure events are NEVER applied to
the PCB designs.

No, I don't need to go back to school, the producers of these polished turds NEED to go and LEARN
about the vacuum tube technology basics, to correct THEIR bad designs in the first place.

Their PCB failures, are testament to their lack of knowledge, not mine!!!!!!!!!!!!!!

Their failure to produce a simple easy to read schematic of their polished turds, is further
testament to their lack of knowledge.


They produce schematics without regard to the basics I learned in school. What they produce is full
of worthless notations covering their system ASSEMBLY.

Any real useful information for the service tech is MISSING!!!!!!!!!!!

Where are the voltages for static and dynamic conditions of circuit operation.

Where are the wave forms to be seen at key points the circuit operation.

Where is the continuous uninterrupted signal flow from left to right across the page.

It's a freaking jigsaw puzzle, hop scotching from one place on the page to another. Then, from page
two, back to the top left of page one, to be continued on page three for the output.

A service tech should not have to spend time figuring out the mess they call a schematic, when all
he needs to know is the voltage on this junction at this point on the PCB.

I have got factory schematics with NO voltages on it at all. What the *** good is that. All it
shows is what is connected to what. There is noted R1, is connected to C34, etc..... But, what is
the value of R1, and C34.

THAT, is not on the schematic, or even labeled on the PCB!!!!!!!!!!!!!!!!!!!!!

So I call the company to find out.
I get the tech on the phone, and ask.
He says, hold on while I go get a PCB, to look at it, to find what value it is for you.

ROTFLMFAO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

He, doesn't know!!!!!!!!!!!!!!!!!!!!!!!


There you go. A real life case in point!!!!!!!!!!!!



There is a way to do this, that the cad software, and the user does not provide.

When it is done right, there is no jumping around from place to place, from page to page.

It's very easy to read, and contains relevant information required for servicing, not in house
manufacturing BS.

No, it's not me, that has to go back to school.

It's the ass holes who make polished turds, who have to go back, and learn what they lost.

Then, maybe they will get their act together, and make a REAL freaking tube amp as it should be
made.

Old Ampegs with their early PCB were nicely done, and are still holding up just fine on the vintage
market.

The Ampegs of today, is a different story.

No, it ain't me babe.

Look again.




Regards,

Rich Koerner,
Time Electronics.
http://www.timeelect.com

Specialists in Live Sound FOH Engineering,
Music & Studio Production,
Vintage Instruments, and Tube Amplifiers
.

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