7A19: Difference between revisions

Revision as of 13:32, 17 March 2015

The Tektronix 7A19 is a one-channel 600 MHz vertical amplifier plug-in for 7000-series scopes, designed by Thor Hallen and introduced along with the 7904 mainframe in late 1971/early 1972 (note 1).

Operation

The 7A19 has no variable gain control. An option (#4) was available that added a variable signal delay (± 0.5 ns implemented using a mechanically variable passive delay line), intended to match timing between multiple channels.

The pre-charge setting on the input coupling switch is intended for situations where there might be residual charge on the input coupling capacitor that could overload the input. To use it, one sets the switch to PRE-CHG before connecting the input signal, then waits two seconds before switching to AC (LF point is 1 kHz). The PRE-CHG setting also serves as a ×100 attenuator having a 5 kΩ input impedance in series with 2 μF, extending LF cutoff down to 20 Hz. In the AC GND position, the input is disconnected from the amplifier and terminated in a capacitively coupled 50 Ω load.

Key Specifications

Input impedance	50 Ω
Bandwidth	600 MHz (500 MHz in 7904)
Deflection	10 mV/Div to 1 V/Div, 1—2—5 sequence. Pre-charge circuit may be used as a calibrated ×100 attenuator.
Maximum input	2 W average or 50 Div, in AC mode 100 V DC+peak AC
Variable delay (Opt.4)	-0.5 ns to +0.5 ns

Internals

The 7A19 uses the 155-0068-00 amplifier IC.

Notes

See 7A11 and John Addis, Good Engineering and Fast Vertical Amplifiers, in Jim Williams (Ed.), Analog Circuit Design: Art, Science and Personalities (1991), p.114, and Tektronix New Products 1972 brochure.

Pictures

7A19 without option
7A19 with Opt. 4 (Variable Delay).

Earlier model

Left side (early model with Weinschel attenuator, without Opt. 4)
Right side (early model with Weinschel attenuator)

Later model (B030000+)

Left side (Opt.4 delay line enclosure in front)
Right side
Front right, Tek-built attenuator
Rear right
Front left
Front right
Top view
Attenuator switch contacts
Contacts detail
Contacts detail

@@ Line 13: / Line 13: @@
 The '''Tektronix 7A19''' is a one-channel 600 MHz vertical amplifier plug-in for [[7000-series scopes]], designed by [[Thor Hallen]] and introduced along with the [[7904]] mainframe in late 1971/early 1972 (note 1).
+==Operation==
 The 7A19 has no variable gain control.  An option (#4) was available that added a variable signal delay (± 0.5 ns implemented using a mechanically variable passive delay line), intended to match timing between multiple channels.