[78-L] When is a microgroove not a microgroove?

[Mark Bardenwerper]

On 5/8/2012 7:42 AM, David Lennick wrote:
> Definitely vinyl, about the same thickness as a 45 but no raised center.
>
I think improvements in cartridge design, coupled with the introduction 
of new equalization curves allowed more data to be packed on a record 
than in times past. What was the first year for RIAA? 1954? I have a 
1956 Bogen receiver that has RIAA and several other settings on it.

-- 
Mark L. Bardenwerper, Sr.

Technology...thoughtfully, responsibly.

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