General > General Technical Chat

What ever happened to TV technicians?

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james_s:

--- Quote from: porter on May 08, 2022, 08:21:25 am ---When I was a boy, my Dad wanted me to fix the TV. As I recall, a couple of knobs released the back panel. I pulled the tubes out and brought them to the grocery store to be tested. Tubes were kept right in the tester cabinet. I don't remember if I fixed the thing. 

The things kids were allowed to do back in the day.  :palm:

--- End quote ---

Frankly I think kids should be allowed to do a lot more than they typically are these days. I think there are a lot of people that suffer from a sort of stunted development where they reach adulthood having no ability to go out and do basic life tasks. Kids are too sheltered now.

NiHaoMike:

--- Quote from: Zoli on May 09, 2022, 02:33:41 am ---If you are so sure, why don't you link it?
Thank you.

--- End quote ---
A quick search found the PA119. https://apexanalog.com/products/pa119.html

Zoli:

--- Quote from: NiHaoMike on May 09, 2022, 04:56:53 am ---
--- Quote from: Zoli on May 09, 2022, 02:33:41 am ---If you are so sure, why don't you link it?
Thank you.

--- End quote ---
A quick search found the PA119. https://apexanalog.com/products/pa119.html

--- End quote ---
Well, slightly fells short: 4A vs 10A+, ±40V vs ±70V(+); what about the distortions(sorry not to put it up up in the previous posts), because the square wave doesn't looks too nice(overshoot)?

Miyuki:
Oh that brings memories of the late 90s
Everything was soaked with nicotine
In the basement of the apartment house, I lived as a kid, was a small repair shop. Cigarette smoke come out of the window and at the night there were TVs running to test the long-term functionality.

magic:

--- Quote from: Zoli on May 09, 2022, 12:44:55 am ---I challenge you to build the Alexander amplifier(https://www.analog.com/media/en/technical-documentation/application-notes/58052492001115525484056221917334an211.pdf) with current transistors, and show the original performance(output power, distorsions, bandwith).
--- End quote ---
I see a bunch of jellybeans and those weird linear IGBTs from Toshiba.

Do you think the latter are irreplaceable in this design or that they don't make 2N5551 like they used to?

BTW, Cordell's error-corrected MOSFET amplifier has been characterized in similar manner and beats this thing in most every way except DIM, apparently. That's 100% jellybean discretes, vertical MOSFET output stage.

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