Constructions of ShuGang's 211 and 805A

ja2dhc · 27th November 2010, 02:46 AM

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

http://userdisk.webry.biglobe.ne.jp/..._211vs805A.jpg

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.

danFrank · 27th November 2010, 03:27 AM

Is there a question here?
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.
Daniel

Ty_Bower · 27th November 2010, 11:36 AM

Thanks for the photos. It is interesting to see the construction differences. Your photo shows them close up and very clearly.

27th November 2010, 02:46 AM	#1
ja2dhc diyAudio Member Join Date: Dec 2007	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. http://userdisk.webry.biglobe.ne.jp/..._211vs805A.jpg 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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27th November 2010, 03:27 AM	#2
danFrank diyAudio Member Join Date: May 2005 Location: California	Is there a question here? 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. Daniel

27th November 2010, 11:36 AM	#3
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	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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