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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: Mullard Blackburn date code B7H2 posted by Jeff A W on March 24, 2006 at 16:35:54:
I guess to be most precise I should say, if the getter ring rod is straight, definitely 1967. I've noticed The bent rod seems to start occasionally '68-'69, then consistently by '70s, like other constructional changes in Philips 12AX7s from a given factory, there are extended periods of overlap. So possible you'd get a bent rod in '67, but unlikely. I looked at a couple of '67 Mullards just now and both have the straight rod. Actually, the halos are already a little lower on those compared to earlier I63s.If it happens to be RCA branded ar another with screened date codes, can post that here for confirmation.
My guess would be that you'll find the straight rod, and it's 8/67.
Jeff
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Follow Ups
- 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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