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Millennia Media, Inc.
4600 Missouri Flat Road, Suite 11
Placerville, CA 95667
http://www.mil-media.com
(530) 647-0750
Fax (530) 647-9921
SOURCE
SERIES
TURNOVER
(Hz)
ROLLOFF (dB @ 10
kHz)
Stradivari
750
-16
Supraphone
400
0
Technicord
800
-12
Telefunken
400
0
Transcriptions
various, typical
500
-16
Ultraphone
400
0
Urania
most
COL* or 750
-16
Urania
newer
400
-12
Vanguard
411-22, 6000-18, 7001-
7011,
8000-8004
COL* or 750
-16
Velvet Tone
acoustics to 8/29
300
-16
Vitaphone
950
-18.5
Vitaphone
motion picture
300
0
Vocalion
electricals
300
0
VOX
500 or 750
-16
War Department
12” Special Services
700
-5
Western Electric
early transcriptions
300
0
Westminster
pre-1956
500 or 750
-16
Westminster
“AES” printed on jacket
400
-12
Westrex
200
0
Zonophone
early 71.29 RPM
0
0
Zonophone
most
300
0
Per NAB standards, the nominal speed of a 78
RPM record is precisely 78.26 RPM +/- 0.5%.
*COL — Some recordings were compensated
with a roll off of -16 dB @ 10 kHz and a modified
500 Hz turnover that requires an additional VLF
boost using a 100 Hz shelving filter @ +3.0 dB.
Often referred to as a "Columbia curve," some
sources list this at 300 Hz turnover with similar
HF and VLF characteristics. Better advice: trust
your ears.
Signal block diagram
