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  • DIY Single Ended Vacuum Tube Amplifier

    "dont lecture me about tubesi dont use anything else then tubesin my newest projects"

    Sorry! I wasn't lecturing. You asked so I answered.

    No worries, robot797. It's good to know there's someone else out there valve oriented!....and, thank you!

    I wasn't lecturing.... You asked.

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  • DIY Single Ended Vacuum Tube Amplifier

    I would be willing to bet it's because he used wood for the sockets and the tube would heat that wood past it's kindling temp or at least char it.

    You're almost correct. Usually, tubes don't need to be cooled but in some cases, they do need to be cooled. Some tubes are made with cooling fins and heat sinks.

    'how hot do you think tubes run': It depends on the tube, it's condition, and the work it's haveing to do. First, the cathode is heated to a nice glowing temp. Then, High voltage is placed between the cathode and the plate and electrons are pulled across the space between them with the flow controlled by the grid or grids in the tube. Since there is current and voltage drop across that tube, there is heat generated there as well. In old tv sets with 3 tube IF sections, you could find a weak tube by touching the 3 and replacing the coolest tube. It was doing less work than it's partners in line. I've had damper tubes fail due to the glass envelope getting hot enough to flow into the plate. What's the temp of molten glass?

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  • How to Make a DIY 900°С Mini Alcohol Burner

    For about 15 years of my life, I repaired at least 100 large modem or computer boards to component level every day of the week and always used a 800 degree tip on my solder iron. I was replacing 8 pin to 100 pin LSI The idea was to get in and out fast so the heat had no time to spread into sensitive components. It worked very well as I'm sure this will. As far as it getting to 900 degrees, I used to use alcohol burners while in grade school to melt glass. It will be hot enough. As far as the alcohol harming electrical components, I usually used alcohol to clean the boards and components after I made a repair so you could hardly tell a repair had been made to the board. If not alcohol, then acetone or liquid freon although the freon is much harder to get these days and acetone i...see more »For about 15 years of my life, I repaired at least 100 large modem or computer boards to component level every day of the week and always used a 800 degree tip on my solder iron. I was replacing 8 pin to 100 pin LSI The idea was to get in and out fast so the heat had no time to spread into sensitive components. It worked very well as I'm sure this will. As far as it getting to 900 degrees, I used to use alcohol burners while in grade school to melt glass. It will be hot enough. As far as the alcohol harming electrical components, I usually used alcohol to clean the boards and components after I made a repair so you could hardly tell a repair had been made to the board. If not alcohol, then acetone or liquid freon although the freon is much harder to get these days and acetone is just nasty. I like this thing but I'm not so sure it wouldn't blow up if you sucked too much flame and oxygen back into your bottle. Flame alone would probably not explode in the bottle without some kind of oxygen in there. This is really a good soldering tool if it is safe but I can't speak for it's safety record. Thanks for the idea. Hope nobody gets hurt...

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