7A29

Template:Plugin Sidebar 2 The Tektronix 7A29 is a 1 GHz single-channel vertical plug-in for 7000-series scopes. It is primarily intended for the 7103 and 7104. Like the 7A19, it has no variable gain control, but a variable signal delay was available as an option.

There is also a 7A29P, which has digitally programmable gain, intended for the 7000 series digitizers.

Specifications

• Bandwidth: 1 GHz (in 7104)
• Input impedance: 50 Ω
• 10 mV/div to 1V/div
• single channel
• Option 4: variable delay

Internals

The 7A29 employs a number of Tek-made custom Hypcon-packaged hybrids, the 155-0180-00 fast input protection, 155-0181-00 input amplifier and 155-0175-00 trigger amplifier (2 ×).

It uses a "feed-beside" scheme to compensate for low-frequency anomalies in the frequency response that are attributed to transistor heating. The input connector is a special Tek-made part that is exactly 50 Ω. Typical BNC connectors are around 52 Ω.

Pictures

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  photo of 7A29 from manual (normal and option 4 units)

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  input amplifier schematic

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  output amplifier schematic

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  7A29, left view (Opt. 4 variable delay line enclosure above PCB)

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  7A29 amplifiers

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  7A29, right side, rear

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  7A29, right side, front

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  7A29P