Theory of Operation

Q5 is a current amplifier feeding the output stage. Q3 and Q4 form a push-pull output stage. Q3 acts as a 2.7 mA constant current pull-up, while Q4 is the pull-down transistor. C6 speeds up the amplifier by coupling ac signals to the base of Q3. CR2 and R41 protect the amplifier during crt arcing.

CRT The pinout for the CRT is shown in Figure 4-3.

4 5

36

27

1

149

13

12 11

Pin Description

1Filament (f)

2Cathode (k)

3GRID (g1)

4FOCUS (g3)

5ASTIG (g4)

6GEOM (g5)

7VERT PLATE (y2)

9VERT PLATE (y1)

11HORIZ PLATE (x2)

121st ANODE (g2)

13HORIZ PLATE (x1)

14Filament (f)

Figure 4-3: Pinout of the CRT Socket

1705A Spectrum Monitor

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Tektronix CRT The pinout for the CRT is shown in Figure, Pinout of the CRT Socket 1705A Spectrum Monitor