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L5.
4<
t--,
^N 1....,
,?'rr
?t)
{h/
/
/'
0
.*--'{
\f
47,
Y-'
Ttrbe
12AX7
6550
(Both
Tubes)
5U4GA
(Both
Tubes)
Pre-Amp
Input
Socket
Pins
not
listed
Pin
No.
1
,
-
c)
J
6
7
B
o
J
4
5
B
2
4
6
B
4
5
DC
Volts
No
Signal
430
-45
-45
130
-45
-45
430
430
-+5
.B
435
0
0
435
425
0
DC
Volts
at 60W
ottt
365
-4+
_45
365
-44
-45
365
360
-+5
-2.5
380
0
0
380
365
0
AC
Volts
at 60W
out
106
148
t48
106
T48
148
106
110
tlB
110
9,4
335
335
6.4
0
.36
Itesistance
in
Ohms
Unit
Otr
45x
1M
140K
45x
1M
140K
45*
2500rT
l40K
6
0rs
t+
15
0rT
10K*
320K
are
either
filaments, have
no
voltage
or
are
not
used.
U.
S.
Patents
No.
2,+77,07
4;
2,545,788
;
2,646,467
;
2,654,058
others pending
McINTOSH LABORATORY,
INC.
2
Chambers
Street
Binghamton,
N. Y.,
U.S.A.
In
Can
ada: Manufactured Under
License
by McCurdy Radio
Industries,
Ltd.
22
Front
Street West,
Toronto,
Canada
-6-
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