Audio TU-8200R Lundahl

About the Audio TU-8200R Lundahl

The Elekit TU-8200R Lundahl is a DIY tube amplifier kit, specifically the version that uses Lundahl LL2777B C-core output transformers, known as the TU-8200VK. It is designed to provide high-quality audio with its active automatic bias adjustment feature, which optimizes the bias for various power tubes such as 6L6GC, EL34, 6CA7, KT88, and 6550. The amplifier supports three amplification modes: triode, pentode, and ultra-linear, allowing users to select their preferred sound characteristics. It includes features like overcurrent protection and a FET ripple filter for improved stability and sound quality. The kit is supplied with JJ 6L6GC power tubes and JJ ECC82 preamp tubes. It offers RCA and 3.5mm audio inputs and supports speaker impedance switching between 4-6.3Ω and 8-16Ω. The amplifier's frequency response is 12Hz to 70kHz (-3dB), with a residual noise level of 90μV (IEC-A) in ultra-linear mode with 6L6GC tubes.