Hafler PH60B - Overview

PH60B PHONO STAGE
Haer
3
MAGNET
COIL
STYLUS
The Haer PH60B is a combination pre-preamp and RIAA preamp that
both increases the level to accommodate the moving coil, adds in the
RIAA equalization curve and then boosts the signal so that it can be used
by a typical high delity receiver.
ABOUT THE RIAA EQUALIZATION CURVE
The Recording Institute Association of America (RIAA) gured out that in
order to reproduce a vinyl recording effectively, the high frequencies have
to be exaggerated. Upon playback, the reverse lter must then be applied
– resulting in a at and natural sound.
Moving coil cartridges produce a much
lower output than a moving magnet. In
order to bring their gain up to a useable
level, between 60 and 70dB of gain
is required. This in fact is extremely
difcult to do without introducing noise
or artefact. This is why moving coil
preamps are more expensive.
10 Hz
Preamp
Playback
Record
100 Hz 1 kHz 10 kHz
-20
-10
0
+10
+20
-60 dB -10 dB
Receiver Amp
Moving Coil PH60B
OVERVIEW