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In Reply to: RE: ID of 6BQ5 from England posted by popsy on February 21, 2016 at 10:48:44
Do they have a seam at the top?
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B8d may mean: Blackburn, England Mullard factory. 8 = 1958. d = April.Does the tube have another code line? Like rX or rX2? Could indicate EL84 (subtype).
Picture would be nice.
Edits: 02/21/16
I think I can make out RX1 but problem is the that with this tube it has those two parallel pieces of metal at the top that my other rx1's don't...
Edits: 02/21/16
Those are part of the getter ring. You could have a very early iteration. Just a WAG.
All the Mullard and Dutch Philips EL84 I've owned or know about had a single ring on the post. But, there were several styles of early EL84 tube, many of which I've never seen.
The single round hole in the plate sure looks Blackburn-made Mullard. How is the tone like?
You know that the early and earliest versions of almost every vintage tube tended to be the best sounding; right ?
So called "D-Getter" EL84s reign supreme in tone to my ears...
Anyone lucky enough to have a matching quad for their push-pull amps will also quickly know...probably undoubtedly...
Esp in Class "A" amps, like the Vox AC-15 and 30s. Rich harmonics with a powerful bass. Not duplicated with other EL84 (except, maybe the RCA 7189A).
Haven't heard or seen a GOOD NOS Mullard, in ten years.
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