(02-03-2017, 03:16 AM)Nowhere-Man Wrote: Mark says his learning electronics in the early years came from a number of won battles. For me, it's more a feeling of trying to win wars. Sometimes I feel I could lose these wars. Tonight my battle was to do with the same thing - anode current and resistance applied to voltage. After this battle I feel typical current for a triode heptode like ECH1 is about 3.5 or 4 milliamps. I know the triode anode voltage is 95 volts because it's in the tables. The current has been listed on sites up to 13 milliamps.
The other question I will come back to.
If you're referring to the ECH81 in that Saalburg 5170 then you're not far off, switched to AM I make Iat 3.7mA and Iah 5mA.
EDIT: Regarding the 13mA figure, sometimes it's easy to get confused when reading valve manufactures valve data, for instance in the ECH81 data listed here: http://www.r-type.org/pdfs/ech81.pdf in the valve characteristics it lists Iat as 13mA but that is with no voltage on the grid, that is a static figure eg: the triode not operating as an oscillator, when it's operating as an oscillator the grid voltage will be -ve and hence Iat will be less.
Lawrence.
