Hewlett Packard 410B Vacuum Tube VoltmeterThe advertised uses of the 410B were audio, rf and vhf measurements, dc voltage and resistance measurements.Frequency range: 20Hz to 700MHz Voltage range: 0.1 to 300v, in 7 ranges Input impedance: 10meg, 1.5pF shunt In 1955 the list price was $245, making it an expensive instrument. Today you can buy them at online auctions for $20 or $30, about the same price as people pay for simple vtvm's which in the 50's sold for $50. But, do not buy one without the probes, and the tube which goes in the ac probe. These 2-01C tubes are currently selling for about $50. The tubes used in the unit are:
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