the bosch had an amplifier too, some were bolted on outside of distributor, some [i think] were inside dizzy
if an external amp, they suffered overheating problem...had to take them off and clean the points of contact on the amp and dizzy body, then apply a special compound to the rear of amp and refit [cant remember the name of compound, but sure it was just a heat resistent grease]...worth trying before changing the amp
if an internal amp, normally meant the whole dizzy needed changing
symptom used to be..
random cutting out, gets worse the warmer the engine..but always restarted
as problem developed, then restarting got more difficult...usually had to wait 5/10 mins before it will go...till finally, engine just refuses to start..