Second so called Vox AC30 in as many months with the main problem being the
simplest of components on the pre-amp board.
The wire bridging links , solder points therof, for the DC and ground lines
to the ECC83s.
The power amp board is more robust wiring and hand soldering, rather than
wire links and no problems there.
The failed one , with a pair of long nose pliers grabbing the end of the
wire and only marginal extraction force, the wire comes through the "solder
joint".
On most of these wire joints there are no "volcanoes" unlike the other
components - is it the wrong size wire/holes, so this lead free stuff moves
capillary fashion preferentially along the pcb holes and leaves little at
the pad , so only marginally covered?
2005 made, bought 2006, and just out of 1 year warranty.
So reworking all such wire joints and also small caps which seem to have
similar lack of solder depth.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/