3A8
Template:Plugin Sidebar 2 The Tektronix 3A8 is an operational amplifier plug-in for 560-series scopes. It was designed by Roy Hayes.
Internals
The 3A8 contains one vertical display amplifier and two operational amplifiers.
The 3A8 display amplifier can accept inputs from the output of either operational amplifier or from an external input. The input can be AC or DC coupled and can be inverted if desired. It has several transistors plus three 9-pin miniature vacuum tubes: an 8416 and two 6KV8s.
Each 3A8 operational amplifier can accept external inputs and has external as well as internal outputs. Each operational amplifier has a number of transistors plus three Nuvistors: a 6CW4 and a selected pair of 7586s.
Specifications
The vertical display amplifier has a bandwidth of DC-3.5 MHz with sensitivity from .02 to 10 V/cm.
The operational amplifiers have a gain bandwidth product ≥ 10 MHz and a DC open loop gain ≥ 10,000. Output voltage is ≥ ± 25 V. Output current is ≥ 7.5 mA (including feedback current.) Input and feedback resistances and capacitances are separately switch selectable to provide a variety of opamp functions. External components can be substituted by way of front panel banana sockets which also accept any of the following special purpose adapters:
Accessories
- 013-0049-01 Standard Shielded Cover (two supplied with each plugin)
- 013-0048-01 Terminal Adapter Assembly (empty box for user chosen components)
- 013-081 Compensating Adapter
- 013-068 Gating Adapter
- 013-0086-00 Leakage Current Adapter
- 013-0067-00 Logarithmic Amplifier Adapter
Calibration Fixtures
- 067-0507-00 Grid Current Checker
