BTW the ECC33 shown just above, under amp test now, has the code 1324 L9, so it's probably December 1949
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Yep. Do you happen to have the codes on the yellow prints? I've read that yellow (≈ gold) was used in 1970 to celebrate the 50th anniversary year of Mullard (the company). But perhaps there were other times.
OK. That's a fairly big change! Of about 300 kilometers.
BTW They do sound very very good.
Off topic: So does the TS 6F8G FP & TS 7236 pairing. Sweet yet punchy. Nothing missing, nothing overblown.
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Grey staggered plates. D getter.
What else would you like to know?