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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Since when ... posted by Trevor Wilson on December 24, 1999 at 20:49:23:
Trevor, I agree that misleading advertising is not good for the audio community. My greatest concern is your testing this unit with a 600 ohm load. In my general experience, the only tube stage that I have used that had a specified 600 load, used a push-pull output and a step-down transformer at the output. A cathode follower can have a lowish output impedance, without being able to drive 600 ohms. The output impedance is derived from the transconductance of the tube, not its peak operating current. For example, the 6CW4 nuvistor has a G(m) of almost 10,000 uMHO's and this converts to about 100 ohms output impedance, but it has a max current of only 7.6ma. This current isn't enough to drive a 600 ohm load properly. Many feedback circuits can also have a low output impedance, yet not drive 600 ohms properly. For example, many IC's won't drive 600 ohms very well, but can have output impedances below 10 ohms (with negative feedback).
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Follow Ups
- Re: Since when ... - john curl 01:38:36 12/25/99 (3)
- Re: Since when ... - Trevor Wilson 03:09:15 12/25/99 (2)
- Re: Since when ... - john curl 11:07:14 12/25/99 (0)
- Specs are irrelevant. Only sound matters. X10D rules. - Specs man 03:39:21 12/25/99 (0)
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