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Which particular Siemens CCa tube are you making reference to?
















There are at least five distinct types all with different internal constructions that were manufactured in Munich, Germany from the mid 1950's right through to the late 1970's. All variants included the special nomenclature of "CCa" at one time or another. The five different types include:

1. Angled 45-degree D-shaped (extended) getter with a very short non-pronounced broad support rod with top mica (often confused with Hamburg Philips production)
2. D-shaped (extended) getter at 90-degree relative to vertical indented getter support rod with top mica (best sounding from lot)
3. O-shaped getter at 90-degree relative to vertical indented getter support rod with top mica (most commonly desired tube with airy sound)
4. A-frame disk getter on two broad vertical bent getter support rods with top mica (excellent for microphonics)
5. Thin O-shaped ring-getter at 90-degree relative to vertical thin copper getter support rod with no top mica (shitty)

Reference photos of all five types attached.

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