[78-L] Record Noises - Identify and Understand Cause

[David Lennick]

Wow can also be from a dubbed master, in which case, lotsa luck centering that 
baby. Victor stopped sending metals to Canada at some point in the early 40s 
(except for Red Seals) so the Montreal studio dubbed from pressings (probably 
vinyls) to make new masters. Many of them are terrible. And in the 60s, as 
Graham Newton will attest, some 45 masters were cut by dubbing from pressings. 
In fact in the late 50s, when Canada was still issuing 78s, some of THOSE were 
cut by dubbing from 45s! Not from tapes!

Hum can also be in the source, or in the master tape, or in the cutter. Some 
London/English Decca lps have a weird hum, not in the normal areas like 50 or 
100hz..wonder if it's caused by the chip vacuum?

dl

On 1/14/2014 11:29 PM, Mark Bardenwerper wrote:
> Here are a few more noises to categorize:
> Wow, which can be caused by a record with out-of center hole, more
> likely a pressing that was not centered in the mold. This can be
> remedied by centering the record on the turntable after removing the
> spindle.
>
> Hum, sometimes caused by bad record player bearings. Can be a ground
> fault with the equipment.
>
>
>