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Old 23rd April 2010, 05:49 PM   #1
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Default 12AY7 plate current

I have a 12AY7 preamp project and, in reference to the plate characteristics chart, I can achieve a preferred operating point over a range of plate currents. Are there any advantages to running the tube at a higher current; that is, would you purposely run a higher current draw than you need?
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Old 23rd April 2010, 06:40 PM   #2
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Higher current can create more noise. And drive requirements may increase. I don't see any advantage. Why are you using that tube? The 12AX7 is usually the preferred type, or one of its fancy numbered equivalents, like 7025 and the like.
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Old 23rd April 2010, 07:38 PM   #3
Arnulf is offline Arnulf  Europe
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Tubes are usually more linear when their operating point is chosen so that Iq is higher. Refer to dynamic characteristics graph in tube's datasheet for more information,
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Old 23rd April 2010, 08:27 PM   #4
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Quote:
Originally Posted by bob91343 View Post
Higher current can create more noise. And drive requirements may increase. I don't see any advantage. Why are you using that tube? The 12AX7 is usually the preferred type, or one of its fancy numbered equivalents, like 7025 and the like.
12AY7s have a broader bias range compared to the AX7 at the same B+. In this app I ran out of input headroom with the AX7 and didn't need the higher gain, anyway.
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