Vintage / Phase Linear 400 Series Two // Solid-State Amplifier

The Phase Linear 400 Series Two is like the muscle car of vintage amplifiers—big, bold, and not afraid to flex its power. If you’re into gear that screams "built to last," then this amp is basically shouting at you through those giant VU meters.

What's special about the Series Two over the original you ask?

• Circuit Design: The Series Two featured an updated circuit design aimed at improving reliability and reducing distortion. This included better thermal stability and more advanced transistor technology.
• Power Supply: The power supply was upgraded to provide more consistent performance, with better regulation and filtering, which helped to reduce noise and improve overall sound quality.
• Metering and Display: The Series Two had improved metering for monitoring output levels, with more accurate and responsive VU meters. The visual design of the meters was also updated for better readability.
• Protection Circuitry: Enhanced protection circuits were introduced to protect both the amplifier and connected speakers from damage due to short circuits, overheating, or other electrical issues.
• Aesthetic Design: The Series Two had a slightly updated exterior design, with a more modern and polished look compared to the original model. This included changes to the front panel and control layout.
• Sound Quality: Overall, the changes in the Series Two resulted in improved sound quality, with greater clarity, reduced distortion, and a more refined audio performance.

What did we do?

• Full bench test
• Cleaned controls, switches, and chassis
• Replaced missing rubber foot
• Verified meter operation
• Power output significantly exceeds power spec of 210 watts RMS at clipping
• This bad boy is ready to Rock!