Hey gang, I have my beloved Fisher acting funny on me. The left channel is weak with all sources and the right channel seems overly strong. When the balance is turned to about 9 o'clock the right channel is still really blaring. When the balnce is turned further from 9 to 7 the sound cuts out. Is this output tube issues? I had Terry DeWick refurb this some months ago, so it should be mechanically decent. Thanks in advance.