The manual explicitly states: "Always replace output tubes in matched quad sets. Do not mix brands or ages."
After installing new output tubes, you must re-bias the amplifier even if the seller claims they are "pre-biased."
Overall Rating: ⭐⭐⭐½ (3.5/5) – Charming for collectors, frustrating for beginners.
If you are considering buying a used Jadis DA30, you will quickly discover that the amplifier is a masterpiece of vintage French valve audio. The manual, however, is a different kind of artifact. It does not teach you how to use the amplifier; it assumes you already know. jadis da30 manual
This is the most critical maintenance aspect of the Jadis DA30.
Jadis DA30 is a high-end, vacuum tube integrated amplifier operating in Pure Class A , delivering approximately 30W RMS per channel. Quick Setup Guide Tube Installation
Match the provided, factory-tested tubes to their specific sockets as marked in the original manual's "Tube Position" guide typically uses 4 x 6550/KT88/KT90 power tubes, 3 x ECC82/12AU7 2 x ECC83/12AX7 Placement & Safety Place the unit on a flat, solid surface. place it on carpet or inflammable materials. The manual explicitly states: "Always replace output tubes
Ensure open space for ventilation; Class A amplifiers generate significant heat. Avoid using fans for cooling, as sudden temperature changes can cause microcracks in the tubes. Operating Sequence Turning ON : Always turn on your pre-source (like a CD player or DAC) Turning OFF : Switch off the first, then your other equipment
Use a quick, firm movement for the power switch to ensure long-term reliability. Guildford Audio Technical Specifications Specification Power Output 30 W RMS per channel Automatic (Autobias) Sensitivity 20 Hz - 18 KHz (@ -3dB) Power Consumption Maintenance Tips : While the
is largely autobias, professional recommendations suggest a bias range of 95 - 120 mV often being the "sweet spot" for performance. Tube Rolling After installing new output tubes, you must re-bias
: Users often prefer EL34 tubes over the standard 6550/KT88 for a "sweeter" sound profile. Troubleshooting
: If a fuse blows, replace it only with the exact rating specified. If the issue persists, swap tubes between channels to see if the problem follows the tube. or specific tube rolling configurations for this model? JA30 Owner's Manual - Guildford Audio