Nelson-Ross PSA-011

Manuals – Specifications – Links – Pictures

The Nelson-Ross PSA-011 is a spectrum analyzer plug-in for 500-series scopes. The center frequency range is 10 Hz to 20 kHz. It can display amplitude in linear or log scale.

Key Specifications

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Internals

The input is high-impedance and is AC-coupled. The PSA-011 is a single-conversion architecture with a pair of 6BH6 tubes serving as a balanced mixer. After IF filtering and amplification, the signal is detected using a 1N34A germanium diode. The detected voltage from the diode directly drives pin 3 (vertical -) of the scope plug-in interface connector. Pin 1 (vertical +) of the scope plug-in interface connector is fed a DC vertical position voltage by the PSA-011.

The voltage-controlled local oscillator is tuned using a variable-reactance tube, V6, a 6201.

There were at least two major versions produced, without changing the model number. Compare the picture from the manual below with the other front panel photographs.

There was also a tracking generator, called the Nelson Ross 101 SYNCHRO-SWEEP Generator. These are very rare.

Pictures

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  Front panel, as shown in manual.

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  Front

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  Front 2

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  Front right

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  Front left

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  Bottom

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  Bottom 2

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  Left

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  Rear right

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  Rear

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  Rear 2

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  Rear 3

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  Schematic

Components

Some Parts Used in the Nelson-Ross PSA-011

Part	Part Number(s)	Class	Description	Used in
1N34A		Discrete component	germanium point-contact diode	Nelson-Ross PSA-011
6201		Vacuum Tube (Dual Triode)	dual high-gain triode	Nelson-Ross PSA-011
6BH6	154-0026-00 • 154-0285-00	Vacuum Tube (Pentode)	pentode	130 • 162 • 310 • 310A • 512 • 517 • 517A • 524 • Nelson-Ross PSA-011