#1 Help needed on kt88 WAD amplifier
Posted: Thu Jul 02, 2020 10:32 am
Not sure if this is a problem or not. I know very little about valves. On my WAD KT88 power amplifier there are the 4 big kt88 valves along the back and 4 small valves at the front. My potential problem is with one of the small valves. The one at the end glows brighter than the others when first switched on before dimming back down to match the others.
Is this normal or is there a problem. When the tube is warm and the amp is switched off and back on again, the tube looks normal. The problem seems to happen only when the tube is cold.
At present it is having no impact on the sound.
On a separate note my friend borrowed the amp for a short while. He could not get rid of a rather loud hum. On my system there is no noise at all. What might this have been.
Any advice would be greatly appreciated,especially about the valve potential problem
Is this normal or is there a problem. When the tube is warm and the amp is switched off and back on again, the tube looks normal. The problem seems to happen only when the tube is cold.
At present it is having no impact on the sound.
On a separate note my friend borrowed the amp for a short while. He could not get rid of a rather loud hum. On my system there is no noise at all. What might this have been.
Any advice would be greatly appreciated,especially about the valve potential problem