7B70

Template:Plugin Sidebar 2 The Tektronix 7B70 is a 200 MHz time-base plug-in for 7000-series scopes. It has no delay function. For delayed-sweep applications, the 7B70 is operated in conjunction with the model 7B71 delaying timebase. The 7B70/7B71 were primarily intended for the 7704 mainframe.

The 7B71/7B70 were superseded by the 7B85/7B80 pair (400 MHz) in 1976.

Key Specifications

Sweep rate	2 ns/div to 5 s/div, optional ×10 magnifier
Trigger modes	P-P auto, auto, norm, single

X-Y operation

The 7B70 has a dedicated switch to put it in "amplifier mode" for X-Y operation. In this mode, the Trigger Source switch controls the signal source – internal from a vertical plug-in via the trigger path, or external — and the Trigger Coupling switch controls AC vs. DC coupling. In amplifier mode, gain can be varied using an uncalibrated potentiometer.

Links

• Troubleshooting the 7B70 and 7B71 timebases. Tekscope Vol.6 No.4 Sept/Oct 1974
• Tek 7B70 @ barrytech.com
• Tek 7B70 @ amplifier.cd

Internals

The 7B70 contains five 148-0034-00 miniature relays and one 148-0035-00. It also contains one 152-0154-00 and two 152-0125-00 tunnel diodes.

Pictures

• 

  7B70, front panel

• 

  7B70, left side

• 

  7B70, right side

•