Millennia LOC Analog Legacy Phonographic / Archiving Preamplifier - Manual (Page 9)

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LOC
Millennia
Media & Music Systems

LOC Millennia
Media & Music Systems
SOURCE SERIES TURNOVER (Hz) ROLLOFF (dB @ 10 kHz)
London up to LL846 500 or 750 -10.5
London FFRR 1949- 250 or 280 -5
Lyrichord early 400 or COL* -16
newer 629 -16
Mercury thru 10/54 400 -12
MGM 500 0 or -12
Montilla 500 -12
Musicraft 750 -14
“NAB”
standard
500 -16
New Records 750 -16
Nocturne 400 -12
Oceanic COL* or 750 -16
Odeon early electricals 700 0
Odeon pre-1947 300 -8.5
Oiseau-Lyre thru 1954 COL* -8.5
Okeh electricals 300 0 or -8.5
Oriole inconsistent, adjust as required
Orthoacoustic Transcriptions 500 -16
Overtone 400 or 500 -16
Oxford 750 -16
Pacific Jazz 400 -12
Parlophone varies with era 300 or 500 0 or –8.5
Pathe inconsistent, adjust as required
Period 500 -16
Polydor 300 -8.5
Philharmonia 400 -12
Polymusic 500 -16
Polymusic binaural inside band 500 0
RCA Victor early acoustics 71.29 RPM 0 0
later acoustics 76.59 RPM 0 0
1925 78 RPM 250 or 300 0 or -5
1931 LP only 700 or 800 0 to –10.5
1933 375 -8.5
1935 300 or 500 0
1938 500 -5
1938 – 1948 500 0 to -12
1948 500 -10.5
1949- 500 -12 or -13
Rachmoninoff Society 750 -16
Radiofunken 400 0
Remington 500 -16
Renaissance 750 -12
“RIAA”
standard
500 -13.7
Riverside 400 -12
Romeo inconsistent, adjust as required
Schirmer 1000 -24
Stradivari 750 -16
Supraphone 400 0
SOURCE SERIES TURNOVER (Hz) ROLLOFF (dB @ 10 kHz)
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
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 rolloff of -16 dB @ 10 kHz and a modi-
fied 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.