Richter medusa User manual
L
o
u
d
s
p
e
a
k
e
r
s
•
V
a
l
v
e
A
m
p
l
i
f
i
e
r
s
P
r
o
u
d
l
y
A
u
s
t
r
a
l
i
a
n
s
i
n
c
e
1
9
8
6
Vacuum tube amplifier
Operator’s manual
Medusa booklet layout_Layout 1 20/01/16 5:16 PM Page 1
Safety Instructions
1. Warning: To reduce the risk of electric
shock, do not remove screws, cover or
back of the product as there are no
user-serviceable parts inside.
2. Caution: do not operate the amplifier
near any fluids such as vases, beverages
etc.
3. Ventilation: ensure the Medusa is in a
well ventilated position. It should not
be placed in a sealed cabinet or similar.
4. If a good quality surge protector is not
employed, the unit should be
unplugged from the power point in
times of electrical storms and
lightning.
1. Power switch: Press in to turn on the
power; Press again to turn off.
2. Input select (Line 1, Line 2, Line 3,
Balanced, Phono)
3. Volume control
4. Minijack input (Line 3, for portable
devices)
5. Direct Power Amp mode indicator
(when using a separate pre-amp)
6. Volume Unit meter
4 5
23
1
To bias valve 1
Switch amplifier on and allow it to warm up.
1.Turn bias setting knob to V1
2.Using a small screwdriver adjust the trim pot
labelled ‘V1 Bias Adjust’ until the meter reads
28mA (recommended
for KT88 valves) or
30mA (recommended
for KT120 valves if you
have installed them)
Repeat this procedure,
setting the control knob
to V2, V3 and V4 in
turn.
Front panel and controls
Adjusting t e valve bias
Correct valve bias
makes a big difference
to the quality of your
sound, and the life of
your valves. If the
current is too high the
valves will run hot,
reducing their life span.
If the current is too low
the sound may be thin
and lacking volume.
Many valve amp
owners prefer to set
the current slightly low.
Medusa booklet layout_Layout 1 20/01/16 5:16 PM Page 2
Rear panel and connections
12 3 4 5 6 7 8
• Check whether your speakers are 4 or
8 Ohm and use the appropriate inputs.
If in doubt, first use the 4 Ohm inputs.
• Always connect positive to positive
(red) and negative to negative (black).
Never allow live speaker cables to
touch each other.
• Switch off amplifier and disconnect
from power before changing
connections.
1. Phono input 2. Line inputs (Lines 1 & 2 for CD player, Tuner, DVD etc)
3. Balanced inputs (may reduce noise from source)
4. Earth connection for turntables
5. Speaker outputs (Right)*
6. AC power in
7. Speaker outputs (Left)*
8. Power amp direct inputs and mode switch
* Speakers can be connected
via cable or with banana plugs
Basic audio connections
Medusa booklet layout_Layout 1 20/01/16 5:16 PM Page 3
Basic troubles ooting
If the following remedies do not correct a problem, disconnect the amplifier
from the power and contact your authorised dealer or service centre.
Warranty
See two-year warranty details enclosed with your Medusa amplifier.
Specifications
Symptom Cause Remedy
The unit fails to turn on when
the POWER switch is pressed
Power cord is not properly
plugged in
Firmly plug in the power cord
and switch on at wall
No sound The volume control is set fully
counterclockwise
Turn volume partially clockwise
Input cables not connected
securely or incorrect input
selected
Check correct input is selected
on front panel and inputs are
firmly connected to the
CORRECT terminals
Speaker systems not properly
connected
Connect them correctly
as per instructions
No sound from left or right
speaker channel
Speaker systems not properly
connected
Connect them correctly
as per instructions
Input cables not properly
connected
Connect them correctly
as per instructions
Sound is unstable with
inadequate or ‘hollow’ low-
range sound
Positive (+) and negative (–)
speaker connections are not
matched
Connect them correctly
as per instructions
L
o
u
d
s
p
e
a
k
e
r
s
•
V
a
l
v
e
A
m
p
l
i
f
i
e
r
s
P
r
o
u
d
l
y
A
u
s
t
r
a
l
i
a
n
s
i
n
c
e
1
9
8
6
Richter Acoustics Pty Ltd, PO Box 578, Hamilton NSW 2303
(02) 4962 1594 info@richter.com.au www.richter.com.au
Motorised Alps Volume control
old plated input and output terminals
Power amp mode: switch/line input for
third-party pre-amps
Balanced Line input
4 inputs (2x RCA ) (1X 3.5 Mini Jack
Front Plate) (1x dedicated Phono)
Simple Bias adjustment for power valves
Power Output: 50W x2
Dual Mono Design
Output Impedance: 4ohms or 8ohms
Frequency Response: 20Hz–50kHz (5W)
Distortion: 0.1% (10W)
Line input stage
S/N Ratio (LINE): 86dB
Input Sensitivity: 300mV
Unbalanced Input Impedance: 80k ohms
Balanced Input Impedance: 95k ohms
P ono stage
MM Impedance: 47k/68pF
MM Input Sensitivity: 3.5mV
S/N Ratio (Phono): 78dB
Remote control
Full function IR remote control
General
Max. Power Consumption: 300W
Tubes: KT88x4, 12AX7x2, 6SN7x2
Dimensions: 430x350x180mm (LxWxH)
Weight: 30kg
Medusa booklet layout_Layout 1 20/01/16 5:16 PM Page 4
Other Richter Amplifier manuals
