Tektronix 3A74 Instruction Manual page 24

Circuit Description — Type 3A74
INPUT INPUT DIODE OUTPUT AMPLIFIER
i. CF
AMPLIFIER
* — SwiTCHES
je
1ST STAGE
+18.5V
CoMetenenn ey
=3.3ma
BUSSES CONNECTING R444
SWITCHED AMPLIFIERS <
TO OUTPUT AMPLIFIER SIGNAL OUT
) TO DRIVER
eF
444
22. -12.1V &3.8ma
AWAY
ma
m. >i
q
2 - .
Q424
x1.Bma
12.4Vf%3.6ma
+300V 5
ON Vows '\
VAR.
25v EEPECTIVELY
R426 R439
. 14.2mal
|
ADJ R438
pases" R435 -100Vv ~12.2
(CENTERED)
=).3ma ZX 2442 §
+18.5V CURRENT
NOTE;
THICKNESS OF THE HEAVY BLACK LINES |
1S SOMEWHAT PROPORTIONAL TO THE
CURRENT FLOWING IN THAT LINE. |
NO SIGNAL 15 APPLIED TO THE CHANNEL,
Fig. 4-3. Same as Fig. 4-2 except channel 1 is turned ON and the resulting current paths are shown.
4-4 ®