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While halo getters and disc getters are pretty straightforward to identify: square, D, windmill, et al, are less so (at least for me).
Is a windmill getter one piece and punched out, like a fan blade (four lobes)? If so, then what do you call a getter that looks like an extruded "plus" sign?
Are square and D getters made of one bent piece of wire, or an assembly of two or more pieces?
Any photos of the above appreciated.
Follow Ups:
So the first image I posted may be an unusual example of a windmill getter...what do the experts here say?
Hi Steve:
That RCA tube in the picture has what is often called a bent square or bent rectangular getter. It is not a windmill--the tube in your first photo(the Raytheon) is a windmill getter.
From Tubemonger site.
From Google.
Not sure this is the typical windmill getter though...see other windmill getter photo I posted, which seems to have more recurrent images for the type.
From the search box.
Edits: 07/28/12
Hi!
What you are referring to, is not the getter. These metal pieces with various shapes are the supports which held the getter material during the tube assembly process, until it got flashed after evaporation of the glass bulb.
The getter is the material which deposits as a shiny mirror on the glass.
After evaporation these metal supports do not have any function any more
Best regards
Thomas
re: not the getter.
Absolutely right Thomas but as always on AA "folklore" rules!
/m
Maybe peruse Tubemonger's site. 12AX7 and 5751 photo gallery prolly good place to start.
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