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

[neechevoneeznayou at gmail.com]

One might think that even the chip vacuum might be 50 or 100 Hz, no?

joe salerno

On 1/14/2014 10:35 PM, David Lennick wrote:
> 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.
>>
>>
>>
>
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-- 
Joe Salerno