"Ultron" 6SN7 ?

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Hi
A friend of mine has an old stock of NOS (late 1960-ies) unused "Ultron" 6SN7 tubes.
All in unopen boxes.
I was wonder if anyone has any opinion about the quality (regarding sonics) of theses tubes.
Is the "Ultron" brand a lower quality brand compared to example RCAs 6SN7 ?
The box says "made in Germany" which made me think that they could be made by Siemens ?
Regards
P

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Parts Connexion

Topic - "Ultron" 6SN7 ? - ahlgren11@telia.com 23:17:38 02/14/07 (4)

Re: "Ultron" 6SN7 ? - fatbottle 07:17:33 02/16/07 (2)

Re: "Ultron" 6SN7 ? - ahlgren11@telia.com 00:57:06 02/18/07 (1)

Re: "Ultron" 6SN7 ? - fatbottle 01:23:44 02/18/07 (0)

Re: "Ultron" 6SN7 ? - kstagger 05:12:41 02/15/07 (0)

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