Siemens ECC81- with a difference

Tubes Asylum

Questions about tubes and gear that glows. FAQ

Mates,
Today I received a little pile of interesting tubes- 4 Valvo ECC83, 2 Telefunken ECC81s, a Valvo ECC81, and 3 Siemens ECC81s. All these tubes bring minor surprises, the Valvo ECC83 are early 70's Mullard Blackburn, the Valvo ECC81 is Mullard Blackburn, the Telefunken ECC81s are Siemens and Halske Munich, and the three Siemens (not Siemens and Halske) are -well that's my question.
The ECC83 have a metal plate over the upper mica, which I don't remember from the Amperex globe Blackburn ECC83s- which I should think should be identical.
I don't have too many late Siemens tubes- only late E82CC which are still Siemens production. The Siemens ECC81 have the German military eagle symbol and "Made in Germany". The micas have fewer, deeper serrations on the edges and the halo getter is very small. The most distinctive feature is a very stout ribbed support rod that starts at the lower mica, goes through the upper mica to become the getter support- it's really substantial. I have lots of Siemens ECC81 and E81CC but none have this support rod. There are numbers on the bottom cast in between the pins- but in reverse!- "V-17, V-25, and V-35".
Any ideas on the Siemens ECC81-- RFT, Tungsram, Yugo, even Siemens? At $3 each for these tubes, no news will be very disappointing!

Cheers,
Bambi B

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.

Topic - Siemens ECC81- with a difference - Bambi B 17:14:55 01/18/07 (0)

You can not post to an archived thread.