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[Derek Samuel Reese]

Good morning,
how does one go about learning how to diagnose and repair a vintage u67 ?
I think it is in my best interest to start from the beginning since i have a vintage u67 and learn how to measure components and fix problems, measure capacitors and resistors etc,
but i have no idea where to begin.
Are there any books or literature online where i could start to understand this complex world that is the vintage u67 ?
This is not to say that i don't trust a technician to keep my u67 healthy and happy, i just think i should take the initiative and learn :-)

[RadarDoug2]

Most of it is normal electronic servicing, but because of the high impedance parts, they are not so easy to deal with. Often a mike will be noisy, and the only way to fix it is to change suspect parts. Finding 400M resistors like those in the U67 is not that easy. In addition, if you want to measure these parts, you need very specialised test equipment. If you currently have a qualified tech, use him, and spend your time on better pursuits.

[Derek Samuel Reese]

I have the best tech in the universe but i still would like to learn.Can you kindly point me in the direction of where to start ?

[RadarDoug2]

Talk to your tech, see if he will teach you. Other than that, learn electronics with google as your friend. But your tech will have specialised knowledge if he repairs mikes.

[Derek Samuel Reese]

I would but he is incredibly busy all the time.
I was asking for maybe a place to start but no one else is chiming in,
Ok I’m off on my own

[Kai]

... I was asking for maybe a place to start but no one else is chiming in,
Ok I’m off on my own

You're not.

The best place to learn electronics is from books and practical projects.
Google (and specially Youtube) is the best place to laugh about people not knowing how to do it, telling other people to do stupid things.

Start learning the basics, like Ohm's Law, how tubes and transistors work, what a capacitor is good for and the like as starter.
From there you can dig deeper.

I have no direct recommendation for literature in English, but sure it exists.

A valuable vintage mic is the worst place to start learning - don't fix it if it's not broken, DON'T!

Building a tube mic from scratch could be a project for you.
This will even teach you - the hard way - how to safely handle higher voltages 

[Derek Samuel Reese]

This is very useful info and i do appreciate it :-)
I would not touch my u67 lol
I just wanted to start understanding the components