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WIRE OR LEAD
Ringer
Line Switch
426A Tube
(501U Set)
M;tg Cord
Conn Block
End
Inside
Wire
at
Conn
Block
Trnsf Leads
at Conn Block
. Note:
Refer to section on inductive noise for connections using 4-element (425A) tube
BSP 502-S01-115 -i02_1971-QS -21.jpg
Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:56:51
LINE, RINGER AND TUBE CONNECTIONS FOR 500U AND 501 U TELEPHONE SETS
COLOR
BRIDGED
L2
R
s
BK
Ll
K
S-R
A
s
L2
R
y
BK
R
R
y
y
G
G
BK
B
Ring
R
R
y
y
Tip
G
G
GRD
y
B
TABLE I
TIP
TIP PARTY
PARTY
RING
NO
IDENTIFYING GROUND
PARTY
I DENT
10000
GRD
L2
K
L2
G
G
G
K
K
B
A
A
B
L2
L2
A
R
G
G
y
y
y
G
R
R
B
B
B
R
R
R
y
y
y
G
G
G
y
y
y
B
B
B
ISS 2, SECTION 502-501 -1 1 5
NEGATIVE(-)
PARTIES
2 6 500
RING
TIP
B
G
G
B
G
G
K
A
A
G
K
K
L2
A
L2
or G
Ll or G
K
K
L2
L2
G
R
G
y
y
y
R
G
R
B
B
B
R
R
R
y
y
y
G
G
G
y
y
y
B
B
B
.•
POSITIVE(+)
PARTIES
RING
TIP
L2
L2
L2
L2
A
A
K
K
L2
L2
L2
L2
K
K
G
G
R
G
y
y
G
R
B
B
R
R
y
y
G
G
y
y
B
B
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