Supertracer AST

Signal tracer incorporating a VTVM.

DESCRIPTION;

The instrument comprises a two stage tuned RF amplifier, a diode detector and two stage AF amplifier, a loudspeaker and power supply. In addition, a vacuum tube voltmeter measuring up to 500 Volts AC or DC at a resistance of 11 MΩ on DC and 10 MΩ on AC is provided. The tuning range of the RF circuits is 17.5 to 490 kHz, 550 to 1550 kHz. 1.5 to 4 MHz and 6.3 to 18 MHz RF sensitivity is such that input voltage of the order of a few mV may be detected on all ranges so that the instrument is suitable for use in any district where alternating power mains are available.

A capacity type RF multiplier in the input circuits in conjunction with the VTVM enables stage gain measurements to be made.

TEST PROBE;

An RF test probe is fitted internally with a very small series capacity of a few pF so that it does not produce an appreciative detuning effect when applied to the grid or plate of RF or IF stages in a receiver.

The AF test probe is a conventional shielded lead for feeding AF into the tracer or AF out from the tracer for testing AF amplifiers or speakers. The DC probe contains a series 1 MΩ isolating resistor so that the VTVM may be used to measure plate, bias or AVC voltage under actual operating conditions, without disturbing the action of a receiver.

VACUUM TUBE VOLTMETER;

The VTVM features a centre zero scale for direct voltage measurement so that voltages which are either positive or negative with respect to a receiver's chassis are instantly indicated without the necessity of reversing test leads or operating a reversing switch. Zero is at the left for alternating voltage ranges and operation covers the audio frequency range. Voltage ranges are 0/5, 0/25. 0/100 and 0/500 Volts at an input resistance of II MΩ on DC and 10 MΩ on AC ranges.

In conjunction with the amplifying stages of the tracer, the meter will indicate RF or AF voltages down to a value of less than 1 mV. Indications are provided by a large, clearly marked rectangular meter with illuminated scale fitted in an attractive modern plastic case measuring 43" x 4".

The VTVM and tracer may be used simultaneously for observing signals at two distinct points in a receiver. This feature greatly facilitates location of intermittent faults.

In questo link sono elencati 24 modelli, di cui 24 con immagini e 6 con schemi.
Elenco delle radio e altri apparecchi della University / University Graham Instruments Pty. Ltd., Radio Equipment Pty. Ltd.; Sydney