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Old 27th Feb 2020, 5:22 pm   #202
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Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 9,278
Default Re: Grundig TK 819 Any Useful Info

Originally Posted by DMcMahon View Post
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.
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:

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