Hello Mumbles,
biggest problem with most V676 are that the main switches are in pretty bad shape, other than the V276 and the V376 that used metal/ceramic(later epoxy) switches, the 676 used state of the art plastic(acrylic) as an main gain switch. It is pretty hard to impossible to find a replacement and repair is not possible.
There is the possibility to use the remote switch option, but than again you have to disconnect the fine adjust switch that is responsible for the main part of the switching noise.
Hope that helps,