Date identification of four Sylvania 6CS7 tubes (for Leben CS-600 amplifier)

[kasperbergholt]

Clever people,


After a couple of weeks' waiting time, my first four 6CS7 (NOS) tubes (for a Leben CS-600 amplifier) arrived yesterday by mail from the US.

I think they're beautiful. My plan is to get three to four good quads - if not exceptional - so that I have enough for a lifetime. Estimated lifetime is often said to be in the 10,000 hours range, perhaps.

I'm looking for a bit of history of these - including how old they are.

Some pictures below.

Thanks in advance,

Kasper

[Nick B]

Hello and welcome to AN  I see you just started posting here. You bio says you are 44, female and from Copenhagen. Is that true?

[kasperbergholt]

Hello and welcome to AN  I see you just started posting here. You bio says you are 44, female and from Copenhagen. Is that true?

Thank you. Had checked the wrong gender box. So 44, yes, from Copenhagen, yes & male

[Nick B]

Hello and welcome to AN  I see you just started posting here. You bio says you are 44, female and from Copenhagen. Is that true?

Thank you. Had checked the wrong gender box. So 44, yes, from Copenhagen, yes & male

I thought so...very few 44 year old female audiophiles 😄 Enjoy our forum
Nick