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Microgroove (LPs and 45 rpm)

SYSTEM

Treble t/o

Bass t/o

Lower bass t/o Cut at 10 kHz Boost at 50 Hz

ffrr LP 1953

3 .00kHz

450 Hz

100 Hz

11 dB

12.5 dB

CCIR

3.18 kHz

500 Hz

50 Hz

10.5 dB

17 dB

NAB

1.60 kHz

500 Hz

16 dB

16 dB

RIAA

2.125 kHz

500 Hz

50 Hz

13.6 dB

17 dB

Use ffrr LP 1953 for early Decca LPs and for pre 1955 HMV and English Columbia LPs.

CCIR is used by European labels for early LPs and EPs

.

Use NAB (NARTB) for some early American LPs. Use NAB together with the first order 80 Hz bass cut filter

for American Columbia LPs.

RIAA is the universal standard (in theory) of all EP/LPs after 1955

.

REPRODUCTION OF PATHÉ AND EDISON VERTICAL CUT RECORDS

Normally mono recordings are lateral, which means ”side to side” in the groove wall. But some of the first 

recordings were vertically cut, also named as ”hill and dale” recordings. Because of that, a mono cartridge 

is not able to reproduce a vertical groove signal. But a stereo record is a combination of a lateral cut and 

a vertical cut record. That’s why you can use a stereo cartridge. You will get the best result with a special 

costum made stylus for this purpose.

Ask your ”Cartridge Man” for purchasing the right stylus.

For reproduction of Pathé and Edison vertically cut records, activate the ”VERTICAL” switch.

Further references

* International Association of Sound and Audiovisual Archives

    http://www.iasa-web.org/

* Audio Engineering Society

    http://www.aes.org/

* Association for Recorded Sound Collections

    http://www.arsc-audio.org/

* European Broadcast Union

    http://www.ebu.ch/en/index.php

* Society of American Archivists

    http://www.archivists.org/

* Grammy Foundation Grants

    http://www2.grammy.com/GRAMMY_Foundation/Grants/

Page 11

Summary of Contents for MD12

Page 1: ...VADLYD MD12 MK4 78 RPM and RIAA Record Preamplifier Jørgen Vad Lydteknik Farum Gydevej 65 DK 3520 Farum Denmark Phone 45 45806425 ...

Page 2: ...ZATION OF PHONOGRAPH RECORDS 5 STYLUS SELECTION 7 SPEED SELECTION 8 HOW TO USE THE PREAMPLIFIER Front Panel 8 Rear Panel 9 SETTING THE CORRECT EQUALIZATION USING THE PRESETS 10 REPRODUCTION OF PATHÉ AND EDISON RECORDS 11 FURTHER REFERENCES 11 SPECIFICATIONS 12 LIMITED WARRANTY 12 1999 2014 Jørgen Vad Lydteknik All rights reserved ...

Page 3: ... og stoffer der kan være farlige og skadelige for menneskers sundhed og for miljøet når affaldet af elektrisk og elektronisk udstyr WEEE ikke bortskaffes korrekt Produkter der er mærket med nedenstående overkrydsede skraldespand er elektrisk og elektronisk udstyr Den krydsede skraldespand symboliserer at affald af elektrisk og elek tronisk udstyr ikke må bortskaffes sammen med usorteret husholdnin...

Page 4: ...f outputs is balanced with XLR connectors with a second set providing unbalanced output on RCA phono jacks This allows for both professional and consumer use The third set of outputs is also balanced with XLR connectors but it contains a flat output signal This signal is not affected by the eq settings and is useful for making simultaneous archival transfers per Paragraph 5 2 6 7 of IASA TC04 Guid...

Page 5: ...et within a coil When the signal is applied to the coil the stylus moves and engraves a groove in the blank disk There is of course a lot more to it than that but we are considering only the basics here However because the cutter head s movements translate the amplitude swings of the original signal into velocity the rate at which the stylus moves during its swings low frequency signals would be r...

Page 6: ...ncreased amount of treble which can be cut onto an LP Therefore playing a 78rpm record using RIAA equalization all that is available to many people produces far less top end response than is correct particularly for the earliest electrical records where the result is akin to turning the treble control down Turning the treble up gives an improvement but it doesn t touch the important mid range Use ...

Page 7: ...contact point giving a wider area of contact which reduces wear however it can also increase noise from worn or damaged groove walls and I would be dubious about its use for 78s However older 78s were cut to be used with steel needles on the assumption that the needle would wear down to fit the groove in the first few seconds when this wider groove is tracked with a 2 5 thou stylus the result is b...

Page 8: ...two pushbuttons select either MM moving magnet or MC moving coil cartridges for each input An LED lights when MC is engaged in which case load impedances of 50 100 or 200 Ohms can be selected using the appropriate toggle switch above each pushbutton Equalization curves are selected with the rotary switch and the currently active curve is indicated by the appropriate LED Always change equalization ...

Page 9: ...seful for making simultaneous archival transfers per Paragraph 5 2 6 7 of IASA TC04 Guidelines on the Production and Preservation of Digital Audio Objects The preamp is equipped with two identical inputs which makes it possible to have two turntables con nected at the same time As an example one turntable might be for LP EPs and another turntable for 78s Use only the cables intended for use with y...

Page 10: ... with re cords in bad condition which as a result of wear have often lost much their high frequency response Unfor tunately many 78s are in bad condition because they have been played many times Ideally use FLAT for old acoustic recordings Sometimes you will find that you will get a better sound with a little bass lift Then try one of the other eq settings and use the 80 Hz bass cut filter Next eq...

Page 11: ...wall But some of the first recordings were vertically cut also named as hill and dale recordings Because of that a mono cartridge is not able to reproduce a vertical groove signal But a stereo record is a combination of a lateral cut and a vertical cut record That s why you can use a stereo cartridge You will get the best result with a special costum made stylus for this purpose Ask your Cartridge...

Page 12: ...ground pin 2 hot pin 3 cold Limited Warranty VADLYD MD12 MK4 is warranted for two years from date of purchase to be free of defects in materials and workmanship In event of such defect VADLYD MD12 MK4 will be repaired promptly without charge This warranty excludes defects due to normal wear abuse shipping damage or failure to use product in accordance with instructions This warranty is void in the...

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