This is a superb,very high
quality, early Marine receiver made by the famous Marconi Company in England.It was
designed for loudspeaker reception of telegraph or telephone signals over a waveband of
100-2000 metres,in 4 ranges,namely,100-220 metres,220-500metres,500-900metres and 900-2000
metres.The Marconi receiver uses 2volt valves,(tubes).Two high-frequency screened grid
tube stages are employed and the coils suitable for the tuned anode circuits are selected
by means of a wave-change switch.This consists of 3 barrel switches, which are ganged and
operated by a single leaver.Tuning is carried out by variable condensers,(capacitors).The
capacitors which tune the 
aerial input circuit to the grid of the first tube and the first
tuned anode circuit are ganged and operated by means of the left-hand plated knob.The knob
situated on the right controls the tuning of the capacitor in the second tuned anode
circuit.Marconi engineers found that it was advantageous to be able to operate the tuning
of this circuit separately ,in order to obtain maximum benefit when reaction is used to
sharpen tuning or to facilitate CW reception.The tube detector works on the anode bend
principle and a pentode output tube is transformer coupled to the detector.Battery supply
terminals are situated on the front of the receiver and are suitably labelled.These should
be connected up as indicated.Supply requirements are HT3(B+3) and HT2(B+2), which are
joined,120volts DC and HT1(B+1) 60 volts DC.Grid bias, (3 volts) is required and this may
be conveniently supplied by a small battery, 
connected externally.This
supplies the negative bias required by the output valve.The positive terminal of the grid
bias battery must of course be connected to the LT negative.The output terminals labelled
"loud speaker" are in the output circuit of the output tube and may be connected
directly to a high resistance (4000 ohms) loudspeaker,or through a transformer if it is
desired to use a low resistance loudspeaker.Variable coupling is introduced between the
aerial (antennae) and the first tuned circuit.This provides a convenient form of volume
control which also prevents saturationof the detector circuit when a very strong signal is
being received.The quality of the mechanical engineering used in the construction of this
set is of a first class standard throughout.The 
electrical layout is also of
a comparable high standard.This Marconi Marine Radio Receiver is now so rare, that is now
almost impossible to obtain an example, even one in poor condition.To find such a receiver
in the superb, first class condition and working order, which this set is in,is almost
unheard of.Research has successfully located a circuit diagram for the receiver and a copy
will be supplied with the set.This is an almost unique opportunity for the serious
collector ,to purchase a prestigeous and very desirable and extremely rare receiver.The
price is $2720 US Dollars,which includes the cost of air freight to the USA.