CS Port
The GM70PA is a Class-A vacuum tube stereo power amplifier that delivers 30W + 30W of powerful, distortion-free audio using the direct-heated triode GM70. Designed to bring out three-dimensional realism and sonic clarity, this amplifier features a non-feedback architecture and high linearity. Equipped with both dual-mono and bridge mode options, it adapts flexibly to high-performance audio systems. Whether you prefer graphite or copper plate tubes, the GM70PA was built for serious music lovers who want rich dynamics and unmatched precision in sound reproduction.
This amplifier is built around the legendary GM70 direct-heated triode, operating with a high plate voltage of 1050V and capable of driving low-frequency-heavy speakers with ease. The two-stage amplification with C3g tubes suppresses harmonic and mixed-modulation distortion without the need for negative feedback. Its large output transformers ensure reliable low-end drive, while a doubly regulated power supply eliminates noise and maintains signal purity. Engineered for flexibility, the GM70PA includes rear-panel switching to toggle between normal, dual-mono, or bridge operation modes.
