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RE: Heerlen vs Blackburn

Curious and I will have to repeat my experimentation to rejog my memory, but IIRC, the Heerlen I's sound different from the Blackburn I 12 AX7's. As memory serves me the Heerlen version always sounded a tad brighter than the Mullards for some reason.

Its like 5751 and comparing Sylvania's to GE's. The Sylvania's consistently sound a bit darker than the GE's even though the internals almost seem to be identical.


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