Hi i have a 453 with triggering issues,This 453 seems to trigger fine with an input on cha (ie the call signal),chb wont trigger unless i have a T piece and feed the call input to both bnc's ch a+b,it wont trigger on ch b unless a has an input also from the call bnc,is that normal,thats with trigg set to internal,also if set to line the waveform moves slowly across the screen,but is ok set to int,any ideas?,i have changed ch a tunnel diodes ans a few resistors and caps as it was suffering from old age and wouldnt trigger on ch a,also cleaned the switches,A is now working b doesent unless cha is fed a signal too.
