No subject

.006 W, we made a change in shape somewhat, making the standard size groove
.002 D [and] .007 W."

And Ron Roscoe wrote:

> Also, if some sort of low frequency attenuation wasn't used, then the 
> amplitudes of low frequencies would have required their attenuation to 
> keep the groove spacing down.  I believe that they saw their options 
> in 1925 as either 1. attenuate the bass or 2. provide a constantly 
> wide groove that would have accommodated the lowest frequency on the 
> new Orthophonic records
> [50 Hz].  The constant wide groove would have required a 12" diameter 
> disc to hold what was previously held on a 10" acoustic disc.
> So the attenuation won out.
> 
> I personally have been very amazed that no corresponding bass boost on 
> playback was ever provided in the earliest electrical playback 
> equipment such as the Victrola 10-51 electrically amplified record
changer.
> 
> Does anyone know when complimentary bass boost in playback began to
appear??

Bass boost on electrical recording was added from the outset - the earliest
Western Electric recordings use a 200- or 250-Hz bass turnover frequency.
This was changed fairly quickly - a matter of a few months at worst - to 500
Hz. I just looked at the Victrola 10-51 schematic, and you're right - just a
transformer-coupled audio amp with no apparent bass boost. I haven't seen
enough specific schematics to answer your question.

Take care,


-
J. E. Knox "The Victor Freak"


--
*Celebrating 30 years of service.*
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