Greetings! I've had a 74-75 Gibson Ripper for a little over a year now, and it played and functioned perfectly until recently. The issue that I have now is that out of the 4 positions on the rotary switch, only one gives me "full volume". What I mean by that is that while positions 1, 2 and 4 work, they are appx. 25% as loud as position 3. Is this a common problem? I haven't been able to find anything that sounds similar to this issue using google or by searching on this website. I should also note that up until about November, each switch position gave me fairly even volume while switching channels.