Two transition prototype 1963 Twin Reverb amps have been found in both brown and blonde Tolex covering. The brown one still had the harmonic tremolo and early Vibroverb reverb circuitry with an extra tube and rear dwell control. The blonde Twin Reverb Leo gave to steel player Red Rhodes for testing purposes at the famous Palomino Club (North Hollywood). Performing in the house band with band leader Gene Davis, Red played his Pedal 1000 steel and Twin Reverb live, and on some popular TV shows including Cal's Corral (I'll eat a bug! Cal Worthington), Star Route, and Country Music Time.