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Old 24th Dec 2019, 12:22 am   #11
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 3,828
Default Re: Marconiphone 538

6K7Gs seem to be made with a perforated metal screen around the anode- I wonder if that gives more dependable screening than that employed in the M-OV series valves, which is possibly just the graphite inner glass coating, though it's difficult to see through it to see if the anode cylinder is exposed or screened like the 6K7G. Maybe a sacrifice is called for....
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