18
How to Install Vacuum Tubes
Pin No. 9
Pin No.1
How to Install 9-Pin Vacuum Tubes
1 2 A U 7
(
E C C 8 2
)、
1 2 A X 7
(
E C C 8 3
)
Applicable vacuum tube:
、
5 B K 7
、
1 2 B H 7
、
12AT7
(
ECC81
)、
6922
（
ECC88
),
etc. 9-Pin vacuum tubes
.
Instructions to Change and Install the vacuum tubes:
To install a nine-pin vacuum tube, align the pins of the vacuum
tube with the holes of the tube socket and insert the tube
vertically up and down (as shown in the figure above).
Please note that when installing the nine-pin vacuum
tube, pay attention to the alignment of the vacuum tube
pins with the holes of the tube socket. Otherwise wrong
insertion will cause damage to the vacuum tube and
prevent the amplifier from working properly, which may
lead to failure of the amplifier.
Positioning Pin
How to Install 8-Pin Vacuum Tubes
Applicable vacuum tube:
KT150
、
KT170
、
KT88
、
6550
、
EL34
、
6V6
、
6SN7
、
6SL7
、
5AR4
,
etc. 8-pin vacuum tubes.
Instructions to Change and Install the vacuum tubes:
To install an eight-pin vacuum tube, align the positioning pin of
the tube with the grooves in the positioning holes of the tube
socket, and install the tube by pulling up and down vertically
(as shown in the figure above).
Please note that when installing the eight-pin vacuum tube,
pay attention to the alignment of the vacuum tube positioning
pin with the positioning hole of the tube socket. Otherwise
wrong insertion will cause damage to the vacuum tube and
prevent the amplifier from working properly, which may lead to
failure of the amplifier.
How to Install 4-Pin Vacuum Tubes
Applicable vacuum tube:
300B
、
2A3 etc. 4-pin vacuum tubes .
Instructions to Change and Install the vacuum tubes:
To install a four-pin vacuum tube, please pay attention to the
thickness of differnet pins of the vacuum tube and the size of
the tube socket hole. Thick pin should be aligned with the big
hole, and the thin pin should be aligned with the small hole.
Install the tube vertically up and down (as shown in the figure
above).
Please note that when installing the four-pin vacuum tube,
pay attention to the thickness of differnet pins of the vacuum
tube and the size of the tube socket holes. Otherwise wrong
insertion will cause damage to the vacuum tube and prevent
the amplifier from working properly, which may lead to failure
of the amplifier.
Thin Pin
Thick Pin
Big Hole
Small Hole
How to Install Big 4-Pin Vacuum Tubes
Applicable vacuum tube:
845
、
805
、
211 etc. 4-pin vacuum tubes.
Instructions to Change and Install the vacuum tubes:
To install the big four-pin vacuum tube, align the vacuum tube
positioning pin with positioning pin slot of the tube socket and
then rotate 45° clockwise to tighten. (As shown in the picture
above). To take out the big four-pin vacuum tube, turn the tube
45° counterclockwise and take it out upward after loosening.
Please note that when installing the big four-pin vacuum
tube, pay attention to the alignment of the vacuum tube
positioning pin with positioning pin slot of the tube socket and
then rotate 45° clockwise to tighten. It is strictly forbidden to
install the vacuum tube when the positioning pin is off or
missing. Otherwise wrong insertion will cause damage to the
vacuum tube and prevent the amplifier from working properly,
which may lead to failure of the amplifier.
Positioning Pin
Positioning Pin Slot