TELTRON TUBES (Original style tubes still available. Call for prices.)
INTRODUCTION | FINE BEAM TUBE |
PLANAR DIODE | PLANAR TRIODE | GAS-FILLED (HE or NE) PLANAR TRIODE |
THOMSON e/m TUBE | LARGE DIAMETER FINE BEAM e/m TUBE |
HERTZ TUBE DATA ACQUISITION SYSTEM | FRANCK-HERTZ TUBE |
ELECTRON DIFFRACTION TUBE| POWER SUPPLIES |
CLASSICAL ELECTRON PHYSICS SYSTEM | TUBE ACCESSORIES
TEL 2520 Planar Diode
TEL 2520 PLANAR DIODE TUBE
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- phenomena of thermionic effect in vacuum
- the Edison effect and space charge
- for fixed temperature, charge flow depends on electrode potential difference
- “saturation” current depends on filament temperature
- evidence of unilateral flow of charge
- determination of e/m by magnetron method (use TEL 2502)
- application of diode as rectifier
- characteristic curve la/Va, Three Halves Power Law
- filament temperature studies, Richardson-Dushman and Stefan
The Planar Diode consists of a pure tungsten wire filament and a circular plate within an evacuated, clear glass bulb, the inside of which has been made electrically conducting to eliminate external electrostatic field effects. All connections are made on the Universal Stand. The performance of the large geometry configuration has been improved by attaching to one of the filament leads a circular backing disk to provide a more uniform electric field between the cathode and anode electrodes.
Power supply
Optimum plate voltage, 300V
Maximum filament voltage, 7.5V
Typical plate current, 0.6mA
Recommended Accessories
TEL EV11M Power Unit
TEL 2521 Planar Triode
(Not Pictured)
- establishment of direction of charge flow
- application as an amplifier
- concept of a cathode ray gun (diode electron gun)
- application as an oscillator (use TEL 2502 coils)
- anode and mutual characteristic curves
The Planar Triode is essentially the Planar Diode with a parallel wire grid interposed between the cathode and anode electrodes. All connections are made on the Universal Stand. As with the diode the form of construction corresponds with the conventional triode symbol. Performance of the large geometry configuration has been improved by attaching to one of the filament leads a circular backing disk to provide a more uniform electric field between the cathode and anode electrodes.
Power supply
Optimum plate voltage, 300V.
maximum filament voltage, 7.5V.
Typical plate current, 0.6mA.
Recommended Accessories
TEL EV11M Power Unit
TEL 2532 Gas-Filled (He or Ne) Planar Triode
TEL 2532 GAS-FILLED
PLANAR TRIODE TUBE
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- the la/Va Diode Characteristic, no saturation
- occurrence of gaseous glow at a discrete potential
- the thermionic effect in gas, no rectifier effect
- the cold cathode discharge, positive ions
- collision processes, energy absorption and emission
- ultraviolet excitation
- spectroscope studies, lines dependent on potential difference
- introduction of excitation potentials
- anode and mutual characteristics, the thyratron
- the principles of a relaxation oscillator
Identical in construction to the Planar Triode, this tube has helium or neon gas within the sealed tube. The gaseous glow can be made sufficiently intense to analyze the spectral lines using a spectroscope such as the TEL 2529 Diffraction Grating Spectroscope. All connections are made on the Universal Stand.
Power Supply
Maximum Anode Voltage, 360V DC
Maximum Filament Voltage, 7.5V.
Recommended Accessories
TEL EV11M Power Unit
Diffraction Grating Spectroscope
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TEL 2532.02 (He)
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$ 645.00
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TEL 2532.10 (Ne)
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$ 645.00
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