The heroes of this video series will be three radio tubes used in the input stages of audio amplifier drivers. I will compare the characteristics of amplifier stages with a resistive load, assembled on these radio tubes. The first two radio tubes are well known for their wide application in audio amplification equipment - these are 6N1P and 6N8S. And the third radio tube - 6S8S - nicknamed "Bunny" by radio amateurs - has interesting features that you will learn about from this video series. *** You can help in the development of the Channel: Yandex Money: https://yoomoney.ru/to/410013004521132 This makes it possible to purchase the necessary electronic components for shooting videos according to your requests. Thank you for your help, friends! *** Links to video materials: https://drive.google.com/drive/folder... "Phase inverter - input stage of push-pull audio amplifier" • Phase inverter - input stage of PP amplifi... "6P45S. Final tuning of push-pull PP audio amplifier" • 6P45S. Final tuning of push-pull PP amplifi... "Radio tube tester. DIY Tube Tester» (• Tube tester. Tube tester... 00:00 Channel Unknown Physics – welcomes you! 00:06 Three tested tubes. 00:24 6N1P tube. 00:38 6N8S tube. 00:57 6S8S tube. 01:52 Volt-Amp characteristics of the 6N1P tube. 03:06 Plotting the operating point on the family of Volt-Amp characteristics. 04:56 Tube tester. 05:07 Appearance of the test bench. 08:09 First switch-on. Setting the operating modes. 10:28 Selecting the resistance of the anode load resistor. 11:08 THD 1 percent. 11:43 Selecting the operating bias of the radio tube grid. 13:04 THD at different voltages on radio tube grid. 13:15 Signal spectrum with changing the bias of the radio tube grid. 14:11 I-V characteristic of the new operating point. 14:56 Intermodulation distortion IMD of the 6N1P radio tube. 16:06 Amplitude-frequency characteristic of the 6N1P radio tube. 16:46 THD 1 percent – ​​determining the gain of the cascade. 17:40 Comparison of characteristics of the second 6N1P radio tube. 18:02 THD 1 percent – ​​determining the gain of the cascade on the second radio tube. 18:39 A pair of 6N1P radio tubes. 18:52 I-V characteristic of the new operating point. 19:42 The final circuit of the resistive amplifier on the 6N1P radio tube. 19:55 To be continued! #Radio tubes #Preamplifier #Driver_cascade Videos in the form of short stories and tales about Physics in the world around us are released every week. If you liked the story - like and subscribe to the channel so as not to miss the continuation! QUESTIONS can be asked in the comments to any video, on social networks and by e-mail to the channel: [email protected] I answer all SPECIFIC questions. I hope that your questions and joint answers will help make the channel "Unknown Physics" more interesting! ************************************************************* The channel has many playlists that contain videos about birds and animals, about HANDICRAFT, DIY, HUMOR, entertaining PHYSICS, stories about TRAVELING, YUMMY, TRICKS, how to make a cartoon and much more ... You will definitely find a video according to your interests! The CHANNEL NAVIGATOR will help you navigate the channel. LINKS to the channel's videos are posted on personal pages in social networks and in groups: Add yourself as a FRIEND! (When adding, PLEASE write - where are you from and on what issue) e-mail: [email protected] VKontakte: http://vk.com/afon2015 Odnoklassniki: https://goo.gl/VdSsCY Twitter: / afanasy83 Facebook: / afanasy83 Skype: afanasy83