thanks Corby, and all, for their beam tube buying advice.
On 7/07/2019 4:34 AM, cdel...@juno.com wrote:
When evaluating an instrument with a used tube the beam current is not the best indicator to look at! For an HP instrument If the tube label has the EM voltage listed then with the beam current set to it's proper level check the current EM voltage. As the tube ages you will require more and more EM voltage to bring the gain back to nominal. Also performing a SN test on the tube or even a quick look at the peak/valley/background levels is helpful. Cheers, Corby
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