Thanks Dennis, this is the most comprehensive video on that topic that I have seen.
@vitopower1693
4 жыл бұрын
Thank you so much for taking the time to make this whole process clear. You are an outstanding teacher! Everywhere else I've looked it was as though there were always key parts left out.
@Ratti3
3 жыл бұрын
Thank you, this is the best explanation on KZitem and worked perfectly for my amp.
@erin19030
4 жыл бұрын
This was part of my basic duration when I went to RCA Institutes in 1961. We even plotted our own family of curves from scratch. Today in school vacuum tube theory is barely explained.
@Songwriter376
3 жыл бұрын
It was mandatory for me in technical high school way back when.
@philipdonovan6510
4 жыл бұрын
Thanks Dennis, this was really explained well. I'm getting ready to do a first "ground up" design for a specialized musical instrument and I would like to be seeing how the operation of my tubes are reflected by the data sheets and the math. This video did very well to have a clear method of seeing how it all comes together. Thank you very much! - Phil Donovan
@kgsalvage6306
6 жыл бұрын
I do love this video and the formula that you gave use when determining load lines. The only thing that I pondered on for a long time was the B+ out of the power supply. You said to use that for the maximum voltage. I finally figured out it wasn't directly out of the power supply as the Eb. Shouldn't be said to be the Ebb. The voltage supplied before the load resistor for that tube. Say your power supply B+ directly out of the power supply is 300v Eb going to the output transformers and to a second node resistor dropping it to maybe 280v Ebb, then to the load resistor. Wouldn't the maximum voltage be the 280v Ebb, not 300v Eb. I'm just learning and want to make sure that I have it right. Still, Great video! No one else explained it as good.
@silasfatchett7380
5 жыл бұрын
Yes, 280V. You are correct.
@MrModelaer
8 жыл бұрын
Looking forward for more. Thanks Dennis.
@diablillosaurio
6 жыл бұрын
you are the ULTIMATE JEDI MASTER OF ELECTRONIC VACUUM TUBES, i love your videos
@MrArfisher
8 жыл бұрын
great job,Dennis,looking forward to your upcoming videos,Thanks.
@daniellu9106
5 жыл бұрын
very informative tutorial, I watched more than 5 times thanks!
@startend7196
7 жыл бұрын
Very clear demonstration, thanks Dennis.
@garysewell5465
2 жыл бұрын
Great video
@OIE82
11 ай бұрын
Glad I found this video. It's the most detailed yet. But I have a question. Is the maximum voltage measured with the tube out? (ref 15:33) Cause, it would be different with it in, wouldn't it?
@TheElverma
3 жыл бұрын
Very informative. Why use 2*Io? Curious.
@richardatanacio4049
3 жыл бұрын
Very educational...thank s a lot for this video tutorial
@mohammadmoezi3813
2 жыл бұрын
you are realy good teacher..bravo
@mohammadmoezi3813
10 ай бұрын
hi sir ..thankyou for make this video...sir i have a question.. how can i calculate input and output impedance..please lead me
@skycarl
8 жыл бұрын
Dennis, I don't know what your students paid to get this type of knowledge but I know we got one hellofa deal just now. I'll be watching this again to help set it in lol. Thanks as always. Great stuff. Carl
@dennis525371
8 жыл бұрын
+skycarl Thanks Carl for stopping by. I'm glad you enjoyed it.
@kgsalvage6306
6 жыл бұрын
Great,! I've been looking at schematics, and trying to figure out how to calculate that. My voltage differs a little from most used in schematics. Most are using new run tubes that can operate on higher B+. I have NOS tubes and want them to last as long as possible. Much appreciated!
@rcmanoj
4 жыл бұрын
Excellent video. Very comprehensive & informative. Quick question. Can’t we just get the grid bias voltage & plate current details from tube sheet & calculate cathode bias resistor value ?
@PatrickInCayman
3 жыл бұрын
Excellent presentation and explanation. Where does the .68 come from?
@michelholm5209
4 жыл бұрын
Thanks for the many educational videos i like them all. Can you make a video where you bias calculate a kt (pentode) tube instead of a triode tube or is it the same method? example a kt120 tube typically uses according to data sheets plate voltage 400v Plate current A135-160mA Gr2 225v Gr1-14 Max signal power output 3000 ohms and 30uA. Can i bias it with plate voltage 450v 3k transformer Gr1-45v and 270-300ohm khatode resistance it will give about 150ma. or is it me who has not understood it.
@chuck0mx
5 жыл бұрын
Thanks for sharing information.
@billwilliams6338
4 жыл бұрын
DENNIS CARTER, how do you bias the power tubes in amplifiers compression point? biasing the compression of the power tubes?
@Bob-pd9ge
2 жыл бұрын
Thanks
@ericsundman4994
4 жыл бұрын
I tried to construct a load line with a 12AJ6 tube running at a plate voltage of 12.6 volts and got a line that sloped down to the left instead of down to the right as shown here. What am I doing wrong?
@fernangmail4863
3 жыл бұрын
Hi Dennis, at the beginning, when you make the first decision for the point "P", what was the criteria? I didn't get it. Thank you! You have a new subscriber. ;-)
@bucyruserie1211
6 жыл бұрын
Very useful info Dennis... Do you actually remember these formulas, or do you have them written down?
@andic6676
2 жыл бұрын
How would you determine the AC gain of that stage?
@jmpsmash
5 жыл бұрын
By biasing with cathode resistor, upping the cathode voltage at 8.5V, doesn't that effectively drops B+ by 8.5V? does that need to be compensated somehow?
@ampman5357
5 жыл бұрын
The same current that flows through the cathode is the same as the plate!
@voltagefreak6350
3 жыл бұрын
If I'm wrong then someone please correct me. But from what I've learned a milliamp is 1/1000 of an ampere. If true then what was shown in the video is 0.0007 which would be 7/10,000 of an ampere and 7 milliamps is equal to 0.007 or 7/1000 . That being said then the result should have been 0.016 - 0.007 = 0.009. So 220/ 0.009 = 24,444. hence RL= 25k .
@voltagefreak6350
3 жыл бұрын
Never mind. I mistook what he said. 0.7 milliamps would be 0.0007.
@UDX-21
6 жыл бұрын
Thank you.21
@ColocasiaCorm
3 ай бұрын
Sniff
@andershenriksen6997
3 ай бұрын
Now, what would you say if you could talk? Get to the 'effin' point! Find out what you want to say before recording and then say it while recording! Jeez!
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