7L5
The Tektronix 7L5 is a low frequency (10 Hz – 5 MHz) spectrum analyzer plug-in for 7000-series scopes. It has built-in digital storage, so it will work fine in non-storage mainframes such as the large-screen 7603. It also features digital scale and marker level/frequency (6 digits) readout, and a "max hold" function.
According to the 070-2184-01 manual, instruments with a serial number below Β070000 are missing the B − (Save A) feature and the corresponding button on the front panel. The military version is called PL-1391/U and is also lacking the B − (Save A) feature.
Key Specifications
| Input frequency | 10 Hz – 5 MHz |
|---|---|
| Drift | < 5 Hz/h |
| Resolution bandwidth | 10 Hz – 30 kHz in ×3 / ×10 steps |
| Sweep rate | 10 s/Div to 0.1 ms/Div in 1−2−5 sequence plus Auto |
| Residual FM | < 40 Hzp-p (< 1 Hz from 50 Hz/Div to 2 kHz/Div) |
| Outputs | Horizontal, Video, Calibrator |
| Input impedance | |
| Log Sweep Option | 250 Hz to 222.25 kHz by digitally combining three decade sweeps (250 Hz—2.25 kHz, 2.25 kHz—22.25 kHz, 22.25 kHz—222.25 kHz), 2.5 s sweep time |
Options
No. Log sweep display Tracking generator LED Readout 21 • 25 • 28 • 30 • • 31 • • 32 • • 33 • • •
Links
- 7L5 page @ amplifier.cd with internal photos
- 7L5 in operation @ youtube
- L1-GC
Prices
| Year | 1976 | 1980 | 1988 |
|---|---|---|---|
| Catalog price | $4,500 | $7,075 | $12,500 |
| In 2022 Dollars | $22,400 | $24,400 | $30,000 |
According to an internal memo, in 1979 annual sales were estimated at 454 units.
Pictures
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7L5 Opt. 33 in 7633 mainframe
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7L5 Opt. 32
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7L5 Opt. 25
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7L5 in 7844
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7L5 Opt. 25 without B - (Save A)
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Front Panel of 7L5
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Back side of 7L5 front panel
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Complete IF Assembly of 7L5
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Complete IF Assembly of 7L5
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RF Module (Vertical Control Board and 1st LO assembly) of 7L5
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Sweep board of 7L5
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7L5 A and B oscillator control board front side
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7L5 A and B oscillator control board back side
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Front side of Tune Reference A board
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Back side of Tune Reference A board
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Front side of Tune Reference B board
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Back side of Tune Reference B board
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Front side of A oscillator board
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Back side of A oscillator board
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Front side of B oscillator board
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Back side of B oscillator board
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Later revision of 7L5 digital storage and average board - front side
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Later revision of 7L5 digital storage and average board - back side
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Tektronix 7L5 Transverse Interface Board
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Tektronix 7L5 Transverse Interface Board
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Top view of L3 plugin assembly
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Bottom view of L3 plugin assembly
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7L5 prepared for servicing the sweep and reference boards
7L5 Opt.25 tracking generator plug-in
For internal pictures see the repair section.