Willsenton R8: Explain and Mod the Voltage Regulator 6SN7

In this video I explain the operation of the center 6SN7 voltage stabilizer tube and how to modify the circuit into a dual rail power supply to eliminate cross channel noise and distortion.

This is a video series about the popular Willsenton R8 KT88 EL34 Push Pull tube audio amplifier. We will go through the repair this amp needs, testing and reviews of the amp as delivered, and then work on modifications to improve the sound quality and durability.

Schematics are here: https://www.skunkiedesigns.com/r8-mods

A great book for DIY amp building info!
Morgan Jones: Building Valve Amplifiers.
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You can buy this amplifier here
https://amzn.to/3Q3Ynjr

The tools I use in this video include:

Hakko FX888D-23BY Digital Soldering Station
https://amzn.to/3WUf7MP