Output ok up to 1 watt out then output clips both sides of sine. All valves
test fine for gain and internal leakage. Signal is fine up to the wiper of
the treble, ie before the splitter/driver, that signal stays sine well into
clipping of the output. Changing the splitter is the same. Running at
clipping and dropping the HT via variac makes no difference , changing
output bias makes no difference to the clipping. The splitter valve cathodes
measure about 34V and the grids about 23V at point of clipping. All the
surrounding Rs measure ok. Output Tx primary measures 139R red to white.
Capacitor problem? amp was subjected to a knock that dropped the output of
the rectifier valve , since changed, a session before this problem emerged.