Another small issue has popped up. Since I've been paying close attention to my vta st-70 (see previous posts)I've noticed that the main power transformer has an audible hum to it that appears to resonate through the bell housing. It is not being transmitted through the speakers. Infact this amp is absolutely dead quiet! I have Klipsch Cornwalls and I can hear absolutely no hiss through the speakers at full volume. Obviously a testament to the high quality of it's components in the amp.
I have read that this hum may be caused by the transformers lamination's being loosened due to heat? Can anything be done?