royley Posted September 15, 2014 Share Posted September 15, 2014 I have had the mki 112 for around 4 years been very reliable until now, sounds great after around 5 - 10 mins it sounds like its going to blow massive increase in volume horrible noise and ive noticed the valves glow differently and change thry are very blue but wild and the other one will be orange. Guessing valve problems anybody got any advice before I spend on valves. Should they glow blue Quote Link to comment Share on other sites More sharing options...
spaceatl Posted September 15, 2014 Share Posted September 15, 2014 4 years is quite good lifetime for power tubes...always better to change them before they blow. Quote Link to comment Share on other sites More sharing options...
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