RodCan

Hi, I'm a total newb so please forgive any unintentional idiocy. I got an old pair of SR-5 Gold with a SRD 6/SB adaptor and although I use them infrequently and give them time to build up charge when I turn them on,the R channel definitely seems to be producing more volume than the L. Any suggestions? I love them,the sound is unlike anything I've heard in 40+ years of collecting audio headgear so any/all comments appreciated.