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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: Tube matchin posted by Paul Joppa on November 21, 2015 at 09:36:29:
Paul, just to add to what you've said, the external 60 dB amplifier is really the key to this. It's also relatively simple to construct. If one selects wide bandwidth opamps with very low noise specifications (nV/hz), two can be connected in series, 30dB gain each, in order to produce a very high quality amplifier. In real world terms, it's possible to construct an amplifier like this with a simple regulated supply (or just a bipolar "cleanup" circuit) that will enable viewing a noise floor below 100 nanovolts. Input this to a PC soundcard with FFT (spectrum analysis) software, and your system will be orders of magnitude more sensitive than what's needed to analyze tubes.
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Follow Ups
- Noise measurement - Triode_Kingdom 12:29:44 11/22/15 (2)
- RE: Noise measurement - Paul Joppa 14:22:09 11/22/15 (1)
- RE: Noise measurement - Triode_Kingdom 15:45:56 11/22/15 (0)
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