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We guarantee the performance of this equipment and the mechanical and electrical workman-
shipto be free of defects for a period of 90 days.
iamaged by improper use nor does it extend to transportation to and f r o m the f a c t o r y .
All McIntosh equipment is designed far long trouble f r e e o p e r a t i o n .
highest quality and are conservatively operated.
viced by your franchised dealer, a competent s e r v i c e m a n , or r e t u r n e d to the f a c t o r y . E q u i p -
ment will not be accepted at the f a c t o r y unless f a c t o r y r e t u r n a u t h o r i z a t i o n is f i r s t r e c e i v e d .
The following chart of operating v o l t a g e s and r e s i s t a n c e s is o f f e r e d as a g u i d e for s e r v i c i n g the
unit.
All voltages and r e s i s t e n c e s a r e m e a s u r e d to c h a s s i s e x c e p t those w i t h a s t e r i s k (*).
These are m e a s u r e d to chassis with pin #2 of the 5U4GB g r o u n d e d .
with high impedence V T V M .
SISTENCES.
Pin No.
Tube
12AX7
(Input)
12AU7
12BH7
G U A R A N T E E
SERVICE I N F O R M A T I O N
N O T E - - U N I T MUST BE T U R N E D OFF WHEN MEASURING RE-
VOLTAGE A N D RESISTANCE CHART
DC Volts
No Signal
1
134
2
0
1.2
3
4&5
Fil
-
6, 7, 8
Fil
9
1
270
2
134
3&8
138
4&5
Fil
270
6
7
110
9
Fil
1
355
2
0
16
3&8
4&5
Fil
6
355
0
7
Fil
9
This guarantee does not extend to components
If t r o u b l e develops the a m p l i f i e r m a y be s e r -
DC Volts
at 30W out
120
0
1. 1
6. 3 V. ac to Pin 9
-
-
235
120
126
6. 3 V. ac to Pin 9
235
100
•
295
0
14
6. 3 V. ac to Pin 9
295
0
-
All c o m p o n e n t s are of
V o l t a g e s are m e a s u r e d
AC Volts
R e s i s t a n c e
at 30W out
U n i t off
1. 3
330K*
0. 24
1M
0. 22
3 . 3 K
-
0 to 70
-
-
-
0 to 70
9
40*
13
330K*
0. 57
13K
-
0 to 70
9
4 3 K *
0
2 6 M *
0 to 70
-
132
12K*
9
220K
0. 32
1.2K
0 to 70
132
12K*
9
220K
0 to 70
-
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