Constructions of ShuGang's 211 and 805A - diyAudio
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Old 27th November 2010, 02:46 AM   #1
ja2dhc is offline ja2dhc  Japan
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Default Constructions of ShuGang's 211 and 805A

I took a photo of ShuGang's 211 and 805A which were manufactured recently.
The photo is located at below URL.

I understood the difference between 805A (Mu=50) and 211 (Mu=12.5)
comes from the dimensions of Grid-Filament, Grid-Plate and Grid winding pitch.
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Old 27th November 2010, 03:27 AM   #2
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The main difference between the two tubes is the grid pitch (211 grid wires are almost twice as far apart per turn than the 805 grid wires) and the spacing between the grid and plate. the plate of the 211 is very close to its grid whereas the plate of the 805 is spaced considerably further from its grid.
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Old 27th November 2010, 11:36 AM   #3
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Thanks for the photos. It is interesting to see the construction differences. Your photo shows them close up and very clearly.
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