Celestion Ditton 551.

Is this crossover schematic of any help?

1666365447912.png


EDIT "Saugkreis" translates as "suction circuit". 😵
 

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If you look at my attachment in post #2, then the treble and mid frequency level control board must be represented by the dotted outline designated as SA 5830.

1666374103545.png


We may have to wait for more information/photographs from mgpgebert.
 
I wonder what happened to C1? If you ever saw it, perhaps you could describe it.

It appears to be part of the overload protection circuit which incorporates a quick-acting fuse with LED failure indicator.

I've had no success in locating the relevant circuit diagram, but it's more than possible that someone viewing this thread will deduce the function of the capacitor and suggest a suitable type and value.