Sounds you don't want to hear.....
For a short time I was working for a semiconductor company here in SanDiego (now long gone)
I had a bad feeling about working there when upon my first day there I overheard a conversation between two cal lab techs. The equipment they were discussing was a plasma vapor disposition device. The gear used a large water cooled triode vacuum tube. (3CW35000)
The tech working on the gear was complaining the high voltage was kicking out and he couldn't find out why... A week later I entered into the conversation since I have a fair amount of vacuum tube experience. So I ask what the problem was, I got the same story how the high voltage kept kicking out and he couldn't find the problem....
So I ask; What have you done up to this point...
The reply was well there was a high voltage power supply problem (blown diodes bad filter caps) I fixed that had had high voltage. I drained the coolant and replaced it. that's when the power supply kept kicking out. we replaced the tube (at $1500.00USD) it still kept kicking out the high voltage...
I asked what did you use for coolant........................
Wait for it....................................................................................
He replied in front of his supervisor.... I used antifreeze.
I said (in front of his supervisor) "you know that is a conductor of electricity right?".
His supervisor went back and purged the cooling system, replaced the antifreeze with some of our own DI water. The tech was terminated that afternoon....
A second story from the same place.
My boss there was not the Cal Lab supervisor but the QA department supervisor, I build fixtures and maintained some of QA's HI-Rel gear. (leak detectors, centrifuges, vibe sets etc...)
He hired a young tech who's job was to take readings on items that we were doing life testing on, among other things...
We had a bridge rectifier that was under full ratings life test, and this new hire was responsible for taking readings on it at the beginning of each day.
I am sitting in my little office working on something... when I hear....
BANG I got this sick feeling in the pit of my stomach.. I got up and walked int our burn-in room just in time to see the last of the smoke that was released from this nearly priceless bridge rectifier...I looked at him, he looked at me......
I said you have to go tell W***.....
I went back my bench and heard the yelling, the door to W***'s office slam, and the next pay period end, W***, and the new hire were let go...
BONUS Story;
When I worked at Loral Corp. there was a period of time when I was responsible for teaching a new tech the ropes. This guy had NO RF experience. Ex-Nave Submarine sonar tech...
Young'ish kid, seemed to always be distracted. I'm suppose to be training this guy so they stick him two rows away from me... I asked my boss "how am I suppose to train him when he is all the way over there?" He said we will move him soon.....
Okay, I did the back N fourth, thing... The guy wouldn't take notes and always kept forgetting to check the zero on his power meter before powering up the transmitter he was supposed to be working on. And yes he always seemed to be distracted.... (he had animated conversations with himself)
I got him through some of the basics of our modules and he even managed to tune them up correctly. (I checked everything he did) so it was time to turn him loose with real RF test equipment and a transmitter to tune up and temp comp...
He gets everything he needs, frequency counter,
Bench receiver, distortion analyzer, audio osciallator, an HP-8559A spectrum analyzer with a diode limiter attached to protect the analyzer. power meters, I set up the plumbing and plumed in the SA, power meter, bench receiver, and counter.
He was instructed NOT to disconnect any of the gear at this time, just the transmitter...
All went well for two days, then he got board...........
I am at my bench and a coworker walked up and said "Why is J***'s spectrum analyzer smoking". My heart stopped.
YES the diode limiter was smoking and smoke was coming out of the reference level cal access hole in the front of the 8559A...
"J**** what the F... are you dong?
"I wanted to see if I could see audio on the spectrum analyzer"...
I looked closer..
The HP audio oscillator was on it's highest range, the level meter was just off the scale, and it was connected to the input of the analyzer...
I looked at J**** and said in a calm voice, "you are putting thirty volts peak to peak into the input of an instrument that is designed to take a fraction of a volt maximum based on where you have the input attenuator set, do yo see what you did wrong?"
Out of the corner of my eye I saw my supervisor walking up just as J*** was answering my question. "I couldn't get a full scale signal on the analyzer" he said.
I replied. "That is because the lower limit is 10MHZ, I see you have a manual open to the specifications, didn't you notice that?"
"No...." was all he said...
They found something for him to do and I reminded my supervisor this was why I needed to have him next to me to oversee what he was doing. ...
He was transferred to our instrumentation division where his skills better fit the job at hand.
My boss did remind me of an Ex Marine who worked over on another product line who connected a 40W S-band transmitter directly to the input of another 8559A. All the front in that analyzer was reduced to carbon all the way back to and including the YIG, YIG filter, and First IF.