Musette 310 Schematic

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MODEL llusette 310 MUS_ETTE__
Do not attemptto adjust the resonance of
this set on a local or powerful cartier. Due
to overloading, such signals might be louder
if the set were actually thrown 'out of
To check resonance, remove the back shield
and place it alsove the tubes, -making sure
however that `it makes a good connection
(metal to metal) with the chassis. The trim-
mer condensers are then accessible and are
found directly behind the three screen grid
tubes on the variable condensers.
Set the dial so that a signal of low inten-
sity and low wavelength is received and
carefully adjust each trimmer to maximum
signal strength. Usually ihe gang condenser
will then be in resonance at the higher wave=
lengths as well, but in some instances when
a new condenser has been installed, it may
be necessary to warp slightly the two outer
plates on each rotor section, which are split
for this purpose. '
ln servicing a set where the volume is in-
sufhcient or broadness of tuning is apparent,
the antenna stage, or the trimmer nearest the
end of the chassis should always be adjusted
to the length of the antenna upon which the
set is to operate.
Vorraoxa DATA
As very high resistances are used the
ordinary set tester will not _give correct indi-
cations on the following circuits: C bias on
the '45 tubes; screen voltages on the r-f.
tubes; cathode voltage on third r-f. tube.
Using a voltmeter having 1,000 ohms per
volt, and with on full, the following
approximate voltages will be obtained: (ln
making these readings the antenna should
Across speaker held ......... 100-120 V.
Chassis to plate of 1st, 2nd r-f.
and '45 tubes . .,.,....... 210-25OV.
Ground to cathodes, 2nd and
Ground to cathode, lst r-f .... 9-10 V.
Filament to filament, all tubes.. 2.4f2.5 V.
Filament to filament of '80 .... 4.86 V.
Should the filament-to-ground reading on
the '80 tube extceed 230 volts, a grounded
electrolytic condenser or an open biasing re-
sistor is indicated; if no reading is obtained,
a grounded plate circuit,`an open high-volt-
age secondary, or open speaker field is indi-
cated. If the plate circuit is grounded the
speaker held is made to dissipate the 'S0's
entire outputand a voltage_o{ 250_to 300
will be obtained across the speaker field
The bias voltage of the '45 tubes in push-
pull is obmincd by reading across the speaker
iield and dividing it by two; this should' be
approximately 50 to 55 volts. .This voltage
is dependent upon the two resistors mounted
on the electrolytic condenser; if a dedecrion
is had on the voltmeter when reading from
ground togthe center tap of these resistors,
and the voltage drop across the speaker field
h from 110 to 120 volts, it may 'be assumed
that the bias on the '4$'s is correct. A reading
of less than 100 volts across the speaker
field is indicative of adefective speaker or
open resistor somewhere within the circuit.
32 awe c 1 M /

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