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Hissing Sound in KT88 Amp

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alfcat

Member
Joined 2007
Hi, I am a newbie to this forum.

There is a Hissing sound coming from my KT88 amp once it has been used for > 3 hours. It won't occur each and every time but the chance of having this annoyance is > 70%.

The Caps were changed but the situation still persists. What could be the cause?

Please advise.

Many thanks
 
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