Valve Amp Revalve Checklist

If your amp has developed a fault and you want to "try" a new set of valves then make sure you first have a look at the revalve checklist below.

If your amp has any of these symptoms then seek the advice of a qualified technician - replacing the valves may not solve the problem and may cause further damage to your amp or the new valves!

• Loud humming noise from the amplifier
• Burning or "cooking" smell from the amp becoming more prominent
• Smoke coming from the amp
• Some or all of the valves don't "light up"
• One or more of the valves getting noticeably hotter than the others (the metalwork of the valve might glow red like an electric fire element)
• Banging or crackling coming through the speaker

In any of these instances switch off the power to the amplifier immediately and seek professional advice.