User's Manual
PA550 Pre Amplier with RIAA Phono preamp
and Headphone Amp
Connection guide
SPECIFICATIONS:
Gain: Line 16.4 dB gain @ 1kHz
Phono 56.6 dB gain @ 1kHz
Input Impedance: 22k line and 47k Phono
Output Impedance: 8 to 600 ohms Headphone,47 ohms RCA
Frequency Response: 3Hz to 36kHz
Equalization: RIAA +/- 1 dB, 14Hz to 23kHz
THD: .005% @ 1KHz
S/N Ratio: >94 dB unweighted
PWR: 15 VDC
Size: 5.5"w x 3.5"d x 1.25"h
Weight: .8 lbs
Indicator: 1 Power LED
Bellari is a division of Rolls Corporation
Salt Lake City, UT
6/18
Short explanation of RIAA equalization.
The RIAA equalization curve was intended to operate as the
global industry standard for records since 1954. However, it
is almost impossible to say when the change actually took
place.
RIAA equalization is a form of pre-emphasis on recording
and de-emphasis on playback. A recording is made with the
low frequencies reduced and the high frequencies boosted,
and on playback the opposite occurs. The net result is a at
frequency response, but with attenuation of high frequency
noise such as hiss and clicks that arise from the recording
medium. Reducing the low frequencies also limits the ex-
cursions the cutter needs to make when cutting a groove.
Groove width is thus reduced, allowing more grooves to t
into a given surface area, permitting longer recording times.
This also reduces physical stresses on the stylus which
might otherwise cause distortion or groove damage during
playback.
INPUT 2 OUTPUT
15 VDC
Preamplifier
+
-
PA550
PA550
MADE IN USA
PWR
MADE IN USA
0
0
In 1
Volume
Bass
0 10
Headphone
Treble
Ch2
Phono
Ch1
-
+
-
+
PHONO
INPUT 2 OUTPUT
15 VDC
Preamplifier
+
-
PA550
PA550
MADE IN USA
PWR
MADE IN USA
0
0
In 1
Volume
Bass
0 10
Headphone
Treble
Ch2
Phono
Ch1
-
+
-
+
PHONO
What's in the box?
1 - Made in USA PA550
1 - 15V power supply PN PS27s
1 - This owners manual
1 - Love for great audio