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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: apparently amplifier tests conducted by the military posted by Triode_Kingdom on March 18, 2015 at 06:51:42:
The ringing is caused by the large amount of global negative feedback, together with inadequate attention to the phase response and stability margin. To be fair, this was the early days when feedback was still new to most people. The extreme form of this instability is called "motorboating". :^)
The real problem is that the output transformer is inside the loop, and its inductance is a strong function of signal frequency and level. I have always guessed that this is the reason the Dynaco Stereo 70 has some feedback from the output tube plates, reducing from the transformer secondary while maintaining large amounts of total feedback.
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Follow Ups
- RE: apparently amplifier tests conducted by the military - Paul Joppa 18:49:54 03/18/15 (4)
- My current "Unit Under Test" doesn't do this - Triode_Kingdom 10:29:23 03/19/15 (2)
- RE: My current "Unit Under Test" doesn't do this - Paul Joppa 15:18:44 03/19/15 (1)
- RE: My current "Unit Under Test" doesn't do this - Triode_Kingdom 13:34:54 03/21/15 (0)
- RE: apparently amplifier tests conducted by the military - Michael Samra 23:40:42 03/18/15 (0)
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