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473 - Unimeter Calibration Kit Bio-Dynamics, Ind USA. , Usa This is a calibration kit for Unimeter colorimeter. It uses a fixed wavelength of 525 nanoMeters, and bandwidth 60nM. There are four calibration points, using four standards, for zero%, 35%, 75%, and 100% transmission. The kit contains four test... |
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Scientific Instruments Cambridge, England |
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Charles M Reeder, Michigan , Usa A thermopile radiation detector probably used for measurements of UV irradiance. |
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480 - Aparatus to measure wavelength in waveguides W H Sanders, |
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482 - Selenium Stack Rectifier Siemens Halske, The ceramic tube contains a series of small Selenium rectifier cells in series. This is a half-wave rectifier rated at about 15kV to 18kV and 1mA. Used in B/W TV receivers for EHT supply. |
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Unknown, |
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485 - Radar transmitting aerial SCR717 US Contractor WWII, Usa UHF dipole aerial (antenna) in a plastic cylinder on the end of a metal stalk. Mounted in an aircraft for Radar purposes. |
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486 - Electrometer amplifier valve ME1400 Philips, |
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487 - Branding Iron, Physics Dept. Equipment UQ Physics, Australia |
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Edwards High Vacuum Ltd. , The McLeod gauge is used to measure vacuum pressure accurately down to 1/10000 millimetre of Mercury. In principle, a sample of gas, the pressure of which is to be measured, is compressed from a large bulb of known volume, into a capillary tube of... |
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RCA, |
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AWV, |
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RCA, |
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Mullard, |
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Toshiba, |
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Philips, |
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GE, |
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Amperex, |
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Trigon, |
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514 - Jumbo valve socket 4 pin UNK, |
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Blaupunkt, |
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515 - Magnoval valve socket 9 pin McMurdo, |
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UNK, |
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A. L. Franklin, Brookvale, NSW , Australia A Fortin style mercury barometer from well-known Australian instrument maker, A.L. Franklin. The column of mercury is supported by the pressure of air on the free surface of the mercury in the cistern at the bottom. Its level can be adjusted to a... |
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AWV, Australia Lab demonstration of the operation of a triode valve. It has a very open wire grid, and anode is a plate that fluoresces apple green under electron impact. As the grid is made more negative wrt the cathode, the area of fluorescence shrinks to... |
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519 - Mercury Vapour Discharge Lamp UNK, The glass U tube contains liquid mercury. It has a filament at each end. It requires a ballast choke, and operates on mains AC. |
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Cathodeon, A special triode used to measure gas pressure. Electrons emitted by a heated cathode are accelerated to a POSITIVE grid and ionise gas molecules by collision. A third electrode, NEGATIVELY biassed, collects the ions. The current is proportional to... |
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Philips, Other This is an early tetrode valve, sold for Amateur Radio use. Manufactured in the 1920s, it has a bright emitter filament ie pure Tungsten, operating at 3.5 Volts. An anode voltage of up to 80 Volts could be used, so this valve has a hard vacuum... |
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522 - Postman - 100 letter scales Maruzen, Japan Hand scales to weigh letters. The scales are held vertically with a finger ring. The pointer rotates about a precalibrated scale to indicate the letter weight in grams. The letter is held at one corner by a spring loaded clip. |
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523 - Protimeter Concretemaster Sir John Gailwey (Instruments) Ltd. Bucks, UK, England This instrument determines the percentage of moisture in set concrete. Two methods are used, the Gel method, and the Pin Electrode method. The meter scale is calibrated for both methods. |
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Arcturus , Usa The 82 is a full-wave vacuum rectifier, used in domestic radio receivers. The blue colour was a sales gimmick. These valves have become very collectable. |
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RCA, Usa This is an early version of a mercury vapour half-wave rectifier, used in transmitting power supplies. It could handle up to 7000 Volts at 0.25 Amp. |
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AWA, Australia This is a transmitting triode valve, with thoriated tungsten filament. Commonly used in final stage of AF modulators. Popular with hi-fi enthusiasts. |
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527 - Valve tetrode VT.60 (807) UNK, England This valve is a version of the famous 807 transmitting tube, developed in WW II from the 6L6G valve. It was used as the RF final stage in medium power transmitters. It was also used as an RF driver stage and in push-pull modulating amplifiers.... |
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UNK, This is a beam tetrode valve used for power amplification of audio frequencies. It was used in domestic radio receivers and audio amplifiers to drive loudspeakers. Later versions of this valve used a shorter cylindrical envelope, and were... |
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AWV, Australia This valve was used to drive the horizontal deflection coils in black and white TV receivers, frequency 15,625 Hz. It also supplied the EHT for the TV picture tube (pix). |
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RCA, |
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STC, |
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AWV, |
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UNK, Usa This is a full-wave vacuum rectifier, used in domestic valve radios and low power commercial equipment |
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534 - Valve Diode-Pentode 6G8G AWA, Australia This valve has, in one envelope, two diodes and a pentode. It was used in domestic radio receivers. The diodes were used to detect the audio from the IF frequency stage, and to provide a negative DC signal to control the gain of earlier stages (AGC... |
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RCA, Mercury Vapour rectifier, half wave 250mA rating. |
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Sylvania, Usa This is a valve with two triodes, used for audio amplification. The top cap is connected to the control grid of one triode. |
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Philips, Australia This valve is a pentode, used as an audio amplifier in amplifiers and domestic radio receivers. It was superseded by the valve 6SJ7. |
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Philips, |
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Philips, |
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542 - Valve double triode 6BQ7A AWV, Australia This valve was used in turret tuners of black and white TV receivers. It was the RF stage, the triodes forming a cascode configuration. The first triode is the input amplifier stage, grid driven, and is low impedance input, typically 300 Ohms. The... |
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543 - Valve Thyratron PL2D2I/PL2I Philips, Holland |
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Ken Rad, |
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Widdis Diamond , |
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Widdis Diamond, |
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547 - Valve Double Triode 12AX7 AWV Co P/L, Australia This valve was used as a phase splitter or two RC-coupled amplifiers in audio amplifiers. |
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Eveready, Australia There are three cylindrical Leclanche cells inside a cardboard tube, D battery size. The Unloaded nominal terminal voltage is 4.5 Volts. It was designed to light a 3.5 Volt bulb in an electric torch. |
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UNK, This valve was used in Radar and radio receivers WWII. |
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550 - Transformer Audio Interstage AWA, Australia The transformer was used for interstage coupling between valves that amplified AF signals in a 1920's radio receiver. The turns ratio is 1:3.5 so there was a voltage gain of 3.5 between stages to boost the overall AF amplification. Valves in the... |
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AGA, Sweden on loan from Qld Maritime Museum |
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552 - Potentiometer Electronic Ducon, |
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553 - Resistor Wirewound 2500 ohms IRC, |
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554 - Meter D'arsonval 50-0-50 UA Master Instruments , |
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Westinghouse, Canada This triode valve is popular with golden-eared Hi-Fi addicts for low-powered audio amplifiers. It was popular in amplifiers such as picture theatres in the 1930s. It has a 2.5 Volt filament, preferred to the later 6A3 with a 6.3 Volt filament. Note... |
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557 - Tetrode transmitting valve CV398 STC, England This is a WW II transmitting valve, used for medium power transmitters or RF driving stage. |
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559 - Acorn Valve VT - 120 (954) RCA, |
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RCA, |
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C A Brown, |
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NIC, |
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Tekronix, |
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Blundell?, |
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570 - Lighthouse Triode Tube 446B RCA, |
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571 - Administrator V Calculator International Calculator Corp., |
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Amphenol, |
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Amphenol, |
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