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Old 13th Mar 2019, 7:28 pm   #49
Uncle Bulgaria
Pentode
 
Join Date: May 2016
Location: Cornwall, UK.
Posts: 188
Default Re: Ferrograph 4A: Restoration advice needed

Thanks for the wrangling!

The EL84 has no continuity except h-h.

The thermistor out of circuit reads 110k Ohm at room temperature. Am I right in thinking that the thermistor and R35 are a divider to keep the screen current constant?

There is no indication I can see for the thermistor's values in the parts list: "Thermistor STC. A1 522/100" is all it says.
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