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Model AL20 0-1.734VAC Scale VU-A, Rear Zero, Spade Terminals, 6V AC/DC Illuminated, Presentor, Sifam

The AL20 Audio Level analogue panel meters complement the proven and popular Presentor series. The meters offer a performance not significantly different from full specification VU meters to meet today's specific audio market requirement for both quality and distinctive retro styling at an affordable price.

Features and benefits

  • Constructed with gloss black phenolic moulded front with glass window and high impact translucent rear body moulding.
  • Taut band core magnet movement incorporated as standard. This rugged movement makes these meters equally suitable for portable or fixed audio applications. There is no calibration effect when mounted on a ferrous panel.


A low range ac voltmeter offering a performance close to that of a full specification VU meter. Please refer to back page for full details. Pointers and dials The combination of tube pointer and flattened arc scale on translucent buff coloured dial results in an easily read meter, even when monitoring a row on a large console. A white dial can be specified if required. The standard scale is based on the VU A scale.

A low range ac voltmeter suitable for connecting across a 600 ohm line and self contained except for requiring an external 3.6k ohm resistor. Calibrated for use with a 3.6k ohm resistor 4vu above the scale marking so that the reference deflection (0vu) is produced by a signal 4vu above 1mW in 600 ohms (1.228v).

The performance of the meter is based upon the requirements of BS 6840: Part 17:1991, IEC 268 - 17: 1990. The dynamic characteristics quoted, which requires the response time to 99% of reference deflection (0vu) to be 0.3 seconds +/-10% with an overswing of at least 1.0% but not more than 1.5% are not fully met.

The overswing, because damping is not so tightly controlled but allowed to spread within normal design restraints, can vary between deadbeat to 5%. To specify the dynamic characteristics in terms of time to 99% of 0vu under such circumstances would give an unrepresentative measure of the speed of response. For this reason the time to reach -3vu with a steady reading of reference deflection (0vu) has been taken as a more realistic measure.

The following comparison can be made based on a rise time to -3vu with steady deflection of 0vu:

  • IEC 0.13 - 0.15 seconds.
  • AL20 0.14 - 0.18 seconds.

Pointers and dials

The combination of pear shaped pointer and conventional arc scale on translucent buff coloured dial results in an easily read meter, even when monitoring a row on a large console. The standard scale is based on the VU A scale.

Zero adjuster

Positioned on the rear as standard.

Operating Temperature

-25°C to +55°C.


External incandescent illumination is supplied on this model. Internal LED illumination is also available for special order items.


6mm tabs are supplied but flying leads are available.

Specifications for 43091

Brand Sifam
Input Frequency Audio (Cal. at 1kHz)
Input Range 0-1.734VAC
Model AL20
Scale, Range, or Display VU-A
Tariff Code 9030.33.1000
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