This Tone King Sky King has no issues. It has the REV E board, which addressed the arcing and shorting issues of of the Rev D and Rev 4 boards.

Thisis a 35-watt, 1x12 all-tube combo guitar amplifier that blends 1950s and 1960s American blackface and tweed amp voicings with boutique warmth, dual reactive attenuators, and versatile power tube modes. Key Specifications & Features

• Power Output: 35 Watts
• Speaker: 1x12 custom-voiced Celestion Tone King speaker (1660)
• Tubes: 6L6GC (power x2), 12AX7 (preamp x4), 12AT7, and 5U4G (tube rectified)
• Channels: Two footswitchable channels (Rhythm and Lead)
• Onboard Effects: Tube-driven spring reverb and bias-modulated tube tremolo
• Power Attenuation: Dual Ironman II reactive power attenuators (independent control for Rhythm and Lead channels)
• Operating Modes: Pentode mode (crisp, tight attack) and Ultralinear mode (spongier, warmer, richer sag) [1, 2, 3, 4, 5]

Tonal Characteristics

• Rhythm Channel: Delivers sparkling, glassy 1960s Fender Blackface-style cleans with deep chime and rounded, syrupy low-end response. [1, 2, 3, 4]
• Lead Channel: Provides 1950s Tweed-style mid-bark that grows into thick, harmonically rich overdrive with an adjustable "Mid-Bite" control for upper-mid punch. [1, 2, 3, 4, 5]
• Power Control: The dual Ironman II attenuators let you crank both clean and lead channels into natural power-tube saturation down to quiet bedroom volumes without altering your tone. [1, 2, 3, 4, 5]