Hewlett-Packard Dual Trace 150A Oscilloscope with 152B Amplifier

Description

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Hewlett-Packard  Dual Trace 150A Oscilloscope with 152B Amplifier
The HP 150A Oscilloscope,
A Vintage Symbol of the HP Entry into the Oscilloscope Business
The beginning of oscilloscope production at HP was marked a change in the overall company philosophy.
In 1955, sixteen years after the company's birth, the Hewlett-Packard catalog listed nearly 250 measuring instruments of every type except one -- the oscilloscope!
At the time, Tektronix oscilloscopes were top of the line and the Tektronix Company had built an enviable reputation for superb quality and reliability. The focus at HP was on the dramatic opportunities in the communications business and Bill and Dave's philosophy was not to build a "me-too" product, however they finally approved a modest oscilloscope development program at HP.
The first two products were the HP 130A and 150A. The 130A was a slick DC to 300 kcs low-frequency scope that filled a niche that Tektronix didn't occupy and the 150A was a 10 Mcs, dual channel plug-in design, which at that time was deemed general purpose.
The Ending Fifties,
General Purpose Oscilloscope
Introduced in the April 1956 issue of the Hewlett Packard Journal, the HP 150A had the following main specifications:
SWEEP: 0.02 µsec/cm to 15 sec/cm in 24 calibrated ranges
SENSITIVITY: 5 mV/cm to 50 V/cm with Model 151A amplifier
PASS BAND: DC to 10 Mc - Rise time less than 0.035 µsec
COUPLING: AC or DC - 1 megohm shunted with 40 µµf
AMPLITUDE CALIBRATOR: 18 cal voltages 0.2 mV to 100 V
CATHODE RAY TUBE: 5AMP - 5000 Volts acceleration
INTENSITY MODULATION: Terminals on rear panel
The Very Beginning of Etched Circuit Techniques (PCBs)
The HP 150A electronic circuitry is made of 52 vacuum tubes. Circuits are constructed in sub-assembly form and all of these sub-assemblies are interconnected with plug-in type wiring. Most sub-assemblies are constructed using etched circuit techniques.
The cathode-ray tube used in the Model 150A is a type 5AMP. This tube was one of the modern monoaccelerator designs which was especially suited to measurement work because of their reduced distortion. Due to the quantity of vacuum tubes, the instrument is fan cooled with filtered air so that components are operated at low temperatures. A thermal cut-out supplements the cooling system to guard against accidental air stoppage.
152B Dual Trace Differential Amplifier.
New plug-in amplifier providing differential input and dual traces  electronically  switched between A and B channels at either 100 KC or on alternate sweeps. Sensitivity range 0.05 v/cm to 50 v/cm, input attenuator with 9 calibrated  ranges in 1 - 2 - 5 - 10 sequence  and vernier.
Condition and Testing
Device has not been powered on for the preservation of the device.
Power cord needs refurbishment as it is damaged.
CRT is and visable parts are in good condition.
Leather handles are still existant, but is crumbling.
Minor ammounts of surface rust in existant.
This was stored in a climate controlled room at standard temperature and humidity of <30% for the past couple decades after being transfered to storage.
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