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John10b · 14th Jul 2019, 4:30 pm

Just measured the voltage across transformer.
Hot valve = 25v
Cold valve = 0v.
So I think we can say the “cold” valve is faulty.
Apart from the actual fault this has been both frustrating and interesting.
To explain very briefly.
I decided to measure the Ia and the Iκ, this is were the frustrating set in, I was getting “odd” results, for example, I was getting an Ia of about 24mA and and Iκ of 3mA?
Cheers
John

14th Jul 2019, 4:30 pm	#56
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Voltages on ECC83 in BlackBox Just measured the voltage across transformer. Hot valve = 25v Cold valve = 0v. So I think we can say the “cold” valve is faulty. Apart from the actual fault this has been both frustrating and interesting. To explain very briefly. I decided to measure the Ia and the Iκ, this is were the frustrating set in, I was getting “odd” results, for example, I was getting an Ia of about 24mA and and Iκ of 3mA? Cheers John