Quote:
Originally Posted by DMcMahon
Not sure if it makes any difference but pin 5 was not gounded as such, effectively it was floating, I said zero volts but there was a small slightly varying voltage on it.
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The screen grid voltage can greatly affect the anode current and thus in this situation the anode voltage.
For screen grid basics see second paragraph of book page 9 here:
https://www.kevinchant.com/uploads/7...ube_manual.pdf
Lawrence.