# Musette 310 Schematic

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Price: $8.00 In stock  Model: 310 Manufacturer: Musette ## Schematic Pages ## Schematics Content: Please note: this content is a computer-generated interpretation of the above schematic and is provided only to help assist you in locating this schematic. For the actual text, please consult the schematic above. Thank you. #### Page 1: PAGE 3 2 MUSETTE MODEL llusette 310 MUS_ETTE__ RESONANCE At>}us'rMEN1' 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 volu.me 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.
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0
32 awe c 1 M /

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