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RE: JJ 300B Quality and Reliability?

I'll ignore the low DCR reference. By the way, the driver supply (+250) is regulated, with a low dynamic impedance.

Here is my concern about runing a 300B at only 53 mA. To do that, you need to have a relatively high negative grid voltage, which moves the operating point toward 'pinch off'. Not 'centered'. So you will be in danger of running into class AB rather than remain in class A, and in a less linear region.

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