your hear will be break in for a few months too with new sound ,it's nice put the old back to see ......
passive line-level high pass filter is the best you can do ..... you can add some flexibility with active jfet B4 Pass ox will be diy soon at diyaudio
well we can push more current ie more power with bias in a classic 45 amp.... my 300bxls is a great tube
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