Telefunken had a unique parts wiring system, not soldered in place, instead it had slotted clips holding each Individual part in place tensioned between spring contacts. Communications receivers require assured reliability of function. Repairability is always more important than price when lives, may be hanging in the balance. Look inside the cabinet.  The early technicians faced the pressures of urgency together with repair challenges more intense than that of the original designers. Component Level fault finding, needed technicians trained to the highest standard. At times they were required to format changes which actually modified the original design. All this could happen while working under the pressure of battle to quickly remedy the cause of new and totally unpredictable faults.