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Johnson
Amplifier
25
Johnson 25 User Manual
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7
S
A
F
E
T
Y
P
R
E
C
A
U
T
I
O
N
S
WARNING
CAUTION:
T
O
REDUCE
THE
RIS
K
OF
FIRE
OR
ELECTR
IC
SHOCK
,
DO
NO
T
EXPOS
E
THIS
A
MPLIFIE
R
T
O
RA
IN
OR
MOI
STUR
E.
DANG
EROU
SL
Y
H
IGH
VOL
T
AG
E
IS
P
RE
SE
NT
I
NSI
DE
T
HE
ENCLOSURE
.
DO
N
O
T
OPEN
TH
E
CA
BI
NE
T
.
R
EF
ER
SE
RV
ICI
NG
T
O
QUALIFIED
P
ERSONNE
L
ONL
Y
.
This
s
ymbol
war
ns
th
e
use
r
of
d
anger
-
ous
vo
ltage
lev
els
local
ized
with
in
t
he
enclo
sure.
This
symbo
l
advis
es
the
user
to
r
ead
all
accom
panying
lite
rature
for
safe
opera
tion
of
the
un
it.
6
8
Table of Contents
Panel Functions
2
Suggested Settings
4
Technical Specifications
5
Safety Precautions
7
Warranty Information
8
4
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Johnson 25 Specifications
General
Input Impedance
1 MΩ
Frequency Response
20Hz - 20kHz
Power Output
25 Watts
Tubes
2x EL84, 3x 12AX7
Channels
2
Output Impedance
4Ω, 8Ω, 16Ω
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