This extremely unusual receiver (the only one which we
have ever seen, at radio-exports.com) was manufactured by the Siemens Company in
Germany.We would estimate that it dates from around the early 1950’s.The
superheterodyne circuit has the lowest frequency range of any receiver which 
we have
ever encountered,the range entending downwards from 1Mc to an incredibly low 100 c/s.in 6
ranges,as follows; 1 Mc – 300 kc’s,300kc’s – 100kc’s,100kc’s
– 30kc’s,30kc’s –10kc’s,10kc’s – 3kc’s,3kc’s-
300 c/s and on the lowest range of all,300c/s – 30 c/s.Tuning is by a two speed dial
drive,the second speed being very slow, to facilitate precise tuning of the wanted
signal.The receiver is in two parts,each self contained in it’s own good quality oak
cabinet.The main receiver (Type 3 U 412),which uses 5 valves(tubes) is in one cabinet and
the other cabinet contains a Pre-Amplifier (Type 3 U 42d),which uses 4 valves (tubes).The
range of the pre-amplifier corresponds with that of the main receiver.Meters are fitted to
both units,to indicate signal levels and bandwidth is switchable,narrow or wide,with the
usual gain controls.This receiving system is extremely well made and is of a high quality
design throughout.The original purpose of this receiving equipment is unknown to us,but
the design suggests that it was intended to be capable of very accurate
work.Fortunately,we have been able to track down circuit diagrams for both the main
receiver and the pre-amplifier,which is a great help and these will of course be supplied
with the equipment.The receiver and it’s pre-amplifier are in good condition and
working order.Power requirements are 110,130,220 or 240 volts a.c.This receiver would be
an excellent purchase for the serious collector of good quality and rare,tube
receivers.The price,which includes the cost of air freight to the USA is $985 U.S.Dollars.