Mullard Blackburn date code B7H2

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209.6.143.5

Does anyone know how to tell if an ECC83 Mullard made tube, but with different company branded label, having a date code of B7H2 was made in Aug 1967 or 1977?!! Thanks.

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Topic - Mullard Blackburn date code B7H2 - Marshall George 06:50:03 03/23/06 (3)

Re: Mullard Blackburn date code B7H2 - Jeff A W 16:35:54 03/24/06 (2)

Re: Mullard Blackburn date code B7H2 - Jeff A W 05:30:34 03/25/06 (0)

Re: Mullard Blackburn date code B7H2 - Marshall George 18:11:57 03/28/06 (0)

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