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Description: | Cardboard box marked "R-205 DEVCON 5 MINUTE EPOXY" containing 9 loose valves, mainly by Mullard. One valve is 'an original micropup' serial no 10E/97B b.5037 'made in usa'. It has central cooling fins, filament wires coming from one end and a grid cap at the other. This is a VHF transmitting valve, described on website http://www.tubecollector.org/vt90.htm (April 2010) as: 'Filament volts 8.25V Filament current 7A Max anode volts 9kV Total emission 5A Max anode dissipation 100W Amplification factor(Va=1kV, Ia=100mA) 16 Max frequency 300MHz Peak pulse output (per pair) 10 kW. The grid connection is at the top, filament at the bottom, and the anode is the centre block. The anode itself is a cylinder with fins attached for cooling. It has a thoriated tungsten filament consisting of a single helix. In operation the valve must be mounted vertically. Forced air cooling is needed and the temperature of the anode block must not exceed 140C.' '. | License: | http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml | Publisher: | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments | Rights holder: | 47718 | Temporal: | 1950-1970 | Source: | University of Aberdeen | Creator: | Mullard + | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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