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RE: Whistling Tube Question

Hi,

I'vo got exactly the same problem. One of my NOS 12ax7 gives me the same squeaky noise with some hum. It lasts for about 10-15 minutes after powering the amp on, not the whole time, but is random sequence, like: 1 minute of whistling, than 10-30 seconds of silence, again few seconds of noise, and again few dozens of seconds - silence...and so on ...
I tried to clean the pins with isopropanol but that did not the job. Do you think it is a good idea to gently use a very fine sanding paper? Like 1000 or 2000 size?

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