WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.

odd tube

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Still learning and have never seen one of these and what's it's used for

wavebourn.com

It is so called Baretter, a ballast tube. Like AC CCS. Used for filament current regulation I have one in my Collins R390A/URR receiver.

Thanks,now I know..heh

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