Fender Dual Showman Brown Sound Mod on NORMAL channel by Jens Kruse - Kruse Kontrol Amplification 

MOD DETAILS: krusekontrol.com/dual_showman...
Features:
• Normal Channel becomes organic Overdrive Channel
• Vibrato Channel remains 100% original for killer 2 channel amp
• Optional: 2 foot-switchable channels: Factory Clean + OD Channels
• Optional: Serial FX Loop
• Optional: Built In Variac (scales amp down to 3W without tone loss)
Also for TWIN REVERB, PRO REVERB, DELUXE REVERB, PRINCETON, SUPER etc.