MA-300 Bias Meter

Name: MA-300 Bias Meter
Brand: Cary Audio

accessories

Cary Audio bias meter for adjusting compatible valve stages of the brand.

Price, selected version, availability and estimated lead time are confirmed individually before any order.

Discuss purchase and listening

Catalogue information verified on the 19 June 2026. Official Cary Audio page.

Summary

The MA-300 is a maintenance accessory: an analogue meter dedicated to the biasing of Cary valve amplifiers, with no playback or general measurement function.

Key Points

Analogue meter for bias adjustment of valve amplifiers.
Measures the direct current (DC) of the valves.
Cable with 6.35 mm connector and included steel support.
Designed for compatible Cary Audio valve amplifiers.

Accessory
Bias meter
For valves

Product images

Gallery

Official product image

Purchasing, listening and delivery

Ordering and system matching

Ask about the selected version and matching with your amplifier, sources and room. Supply arrangements will be confirmed in the quotation. An enquiry does not confirm a sale.

Listening sessions and demonstrations

You can request a listening session by appointment at our Barcelona office (Carrer de Modolell, 57). When we arrange the appointment we confirm which equipment is available to hear, along with the date and time.

Home demonstrations are not offered for this product.

Delivery and setup

Delivery, its cost and the estimated timing are confirmed in writing in your quotation, for your delivery address and before you accept it.

Installation and setup can be requested as an additional service. We assess feasibility and quote it separately.

Editorial Reference

Model context

Position within the Cary range

Analogue bias meter for Cary valve amplifiers, featuring a 0–300 mA DC range and a 6.35 mm jack connector.

Why choose this model?

Cary offers it as an alternative to a general multimeter: fixed scale 0–300 mA DC, analogue needle, and approximately 0.9 m cable with a 6.35 mm connector.

For which system does it make sense?

Periodic bias adjustment in compatible valve amplifiers from the brand.
Domestic maintenance with dedicated meter and included steel support.

Differences compared to similar models

Maintenance accessory without audio signal; complements the valve stages in the catalogue (CAD, SLI, SLP, etc.) but does not replace a general multimeter.

Architecture and Design Decisions

Analogue direct current meter ranging from 0 to 300 mA, featuring a 6.35 mm jack connector and approximately 0.9 m cable. Cary provides a steel stand and asserts compatibility with all its valve amplifiers.

Compatibility and Use

Compatible with all Cary valve amplifiers according to the official specification sheet. Connection via a 6.35 mm jack at the amplifier's bias measurement point.

Official specification limits

Cary does not publish a PDF manual, dimensions, or weight. It does not measure audio signals nor replace a complete multimeter. This sheet is deliberately concise: only verified data from caryaudio.com.

Technical Specifications

Specifications

Type: Analog bias meter for valve amplifiers
Measurement range: 0–300 mA direct current (DC)
Connection: 6.35 mm jack connector (2 conductors); 3-foot cable (≈ 0.9 m)
Includes: Steel support
Compatibility: All Cary Audio valve amplifiers (according to the manufacturer)

Specifications compiled from official Cary Audio sources, reviewed on 19 June 2026. Unverified data is not published; unavailable fields are omitted.

Recommended Applications

Where it fits

High fidelity

Accessories. For those who maintain and adjust Cary Audio equipment and seek the brand's official accessories.

Within the Cary catalogue

Its position in the range

The MA-300 Bias Meter is part of Accessories in the Cary Audio catalogue.

Families: Accessories
Design family: accessories

Reference

More context about this model

Guides

Cary Guide for Valves

Support Knowledge

Bias Adjustment in Valve Amplifiers