Radio Corporation Of America Radiola 25 Instructions Manual Download Page 1 | Manualshive

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Radiola 25

Super-Heterodyne

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Summary of Contents for Radiola 25

Page 1: ...Radiola 25 Super Heterodyne ...

Page 2: ...Radiola 25 REG U S PAT OFF Super Heterodyne ...

Page 3: ...Instructions 86982 Edition F Radio Corporation of America 233 Broadway New York City 10 South La Salle Street 28 Geary Street Chicago 111 San Francisco Cat ...

Page 4: ...d in any one of the following combinations 1 Complete dry battery operation in which the A B and C supply is obtained from dry batteries This is the form in which Radiola 25 is normally supplied 2 B voltage may be obtained from either the RCA Duo Rectron Model AP 937 or Radiola Loudspeaker Model 104 the A and C supply being obtained from the usual dry batteries a R C A Duo Rectron Model AP 937 is ...

Page 5: ...a 25 Read the instructions first then follow the pictures with accompanying descriptions when making the installation EQUIPMENT REQUIRED For Dry Battery Operation The complete installation of the Radiola 25 for dry battery operation requires the following apparatus 5 Radiotrons Model UX 199 furnished with the receiver 1 Radiotron Model UX 120 furnished with the receiver 1 Loudspeaker such as Radio...

Page 6: ...ady No 779 batteries or 2 Ray 0 Vac No 2153 plate batteries or equivalent Those of the horizontal type may be used if the vertical type is not available Approximate size 6 3 4 in by 41 8 in by 3 1 8 in such as 2 Burgess No 2156 plate batteries or 2 Eveready No 766 plate batteries with cardboard container or 2 Ray 0 Vac No 2151 plate batteries or equivalent B 2 Two 45 volt extra large plate batteri...

Page 7: ... Station Selectors from turning during shipment Do this by pressing on the rubber wedge and turning the corresponding drum toward you until the wedge is released from under the metal plate Keep these rubber wedges and replace them if the receiver is shipped at a later date to prevent motion of the Station Selectors Raise the lid of Radiola 25 to the vertical position permitting the stay arm to hol...

Page 8: ... set even for a short time Such connections cause rapid reduction in the useful life of the batteries Remove Four Screws and the Red Shipping Clamp Fig 2 Removal of Shipping Clamp Do not insert the Radiotrons into their sockets until the battery installation has been completed When making battery replacements push in the filament switch K Fig 13 and remove all six Radiotrons from their sockets bef...

Page 9: ...er Place B Batteries in Cabinet and Push Them Toward Front Fig 4 Location of 22 volt B Batteries NOTE Throughout this booklet where two or more wires are connected to a common terminal the color identification of this group of wires is by means of the color of the particular wire on which the metal marker tag is clamped 8 ...

Page 10: ...The battery on the right hand side of the cabinet may be placed in any desired position Fig 5 Connections to C Batteries To INSTALL THE C BATTERIES Place the two grid bias C batteries see paragraphs C l and C 2 pages 5 and 14 on the table to the left of the receiver and connect the pigtail of the 22 volt C battery and three cable leads as described in Fig 5 Now place the two batteries on top of th...

Page 11: ...ALL THE 45 voLT B BATTERIES Place the two 45 volt plate batteries see paragraph B 2 pages 5 and 14 in the two rear corners of the cabinet and connect the four cable leads as described in Fig 8 Place 45 Volt B Batteries in Rear Corners of Cabinet Fig 7 Location of 45 volt B Batteries 10 ...

Page 12: ...the cabinet Fig 9 behind the spacing rail and between the two 45 volt B batteries just put in place Place Six A Batteries in Rear of Cabinet Fig 9 Location of A Batteries 11 Connect Black to Post Connect 45 Two Maroon and Red One Black to 45 Post Connect 45 Maroon to 45 Post Connect One Yellow with Red Tracer One Black with Red Tracer to Post ...

Page 13: ... Long Leads to Outside Posts Fig 10 Connections to A Batteries Insertion of Radiotrons All the Radiotrons should be handled with care Before installing the Radiotrons turn the BATTERY SETTING pointer F Fig 13 to OFF and push in the filament switch K in the center of the vertical control panel Unpack the five Radiotrons Model UX 199 from their cartons It will be noted that the Radiotrons have two s...

Page 14: ...t switch K Then turn the BATTERY SETTING pointer F slowly to the right to 3 5 The Radiotrons should be lighted dimly the glow usually being just visible near the base of each tube Note that the Radiotron in socket 3 will not be lighted as brightly as the others unless Insert Radiotron UX 120 in Socket 6 Only Fig 12 Insertion of Radiotron UX 120 13 ...

Page 15: ...B Batteries see page 5 B 2 Two 45 volt B Batteries see page 5 C l One 4 volt Bias Battery see page 5 C 2 One 22 volt B Battery used as Bias see page 5 D Stay Arm for Lid E One Radiotron UX 120 in Socket 6 only F BATTERY SETTING Pointer G Left hand Station Selector Drum H First Stage Telephone Jack J Two Filament Voltmeter Jacks K Filament Switch L Station Selector Drum Control M Second Stage Telep...

Page 16: ...p with care preferably holding it by the center spindle to avoid damage to or stretching of the wires Push the projecting center spindle of the loop through the loop socket hole Fig 14 in the top of the cabinet rotate it slightly until the contacts line up with the slots in the socket and push it down as far as it will go 15 ...

Page 17: ...acticable and then advancing slightly to improve the quality of reproduction This control may be advanced from time to time as the A batteries grow weaker Voltmeter In order to obtain the maximum useful life of Radiotrons and batteries it is recommended that a high grade high resistance voltmeter be used to adjust the filament terminal voltage to a value not exceeding 3 3 volts This voltage may be...

Page 18: ... left hand drum G at about 10 and hold it to prevent its turning Rotate the right hand drum N slowly back and forth around position 10 say from 5 to 15 If no signals are heard set the left hand drum G at about 12 holding it to prevent turning Then rotate the right hand drum N slowly back and forth around 12 say from 7 to 17 If again no signals are heard set and hold the left hand drum at about 14 ...

Page 19: ...rmly in position and moving the left hand drum a few divisions either forward or backward until the desired intensity is obtained Note that the new position of the left drum affects only the intensity or volume of the signal while a slight change in the position of the right drum affects the quality of reproduction Therefore the right hand drum should be adjusted with extreme care Interference Sig...

Page 20: ...ious stations Once a station is recorded the drums may be reset at any later time to these positions and if the station is broadcasting and reception conditions at the particular time are favorable it should be heard Before starting to record these settings the operator should become familiar with the controls and accustomed to tuning in stations Records should be made with a soft pencil and shoul...

Page 21: ...ptions in service on account of possible failure of a Radiotron and permits ready detection of any Radiotron not operating properly When not mistreated the Radiotrons should operate satisfactorily for many months They may however be seriously damaged or their normally long useful life lessened by 1 Mechanical injury resulting from dropping or severely jarring them causing displacement of the inter...

Page 22: ... is not the UX 120 Radiotron should be replaced Of the five UX 199 Radiotrons the one in socket 2 second from the right when facing the front of the set is the most important and it is well to determine whether this Radiotron is working properly This may be done by touching a moistened finger to the plates of the variable condenser on the right hand side of the panel A sharp click should be heard ...

Page 23: ...lable the batteries may be tested They should be discarded when the voltage has fallen to 17 volts for a 22 volt block or to 34 volts for a 45 volt block Grid or C Battery Indications of an exhausted C battery are distorted signals and a tendency to howl The best practice is to renew the volt C battery whenever the B batteries are replaced NOTE All measurements of A B and C voltages should be made...

Page 24: ...ng Diagram of Radiola 25 NOTE In this wiring diagram two or more leads of a like color contained in the same cable may be distinguished by the numeral following the color designation at each end of a given lead 23 ...

Page 25: ...52 7 356 9 360 1 361 2 365 6 370 2 374 8 Atlantic City N J WAHG WHB 1000 990 980 950 940 930 920 890 880 870 860 850 833 830 810 fKSL KFMQ WGN KTCL fKPSN KFDM WSMB WJAZ WKRC WJAX KNX fKSAC WKAQ KFAB WCBD fKWSC KOB WJAD KZUY WHN WJJD Salt Lake City Utah Elgin 111 Fayetteville Ark Chicago 111 Pittsburgh Pa Seattle Wash Canada Beaumont Tex Buffalo N Y New Orleans La Denver Colo Cincinnati Ohio Canada...

Page 26: ...in KVOO WHAZ KJR WOAI fKHJ WOR KPO fKLDS J WDWF WMAF WLSI KTW KFOA KFI f WFAA WBAP wsm KGW KFRU KLX WHO f WOAW WHA Bristow Okla Miami Beach Fla Troy N Y Cleveland Ohio CQQ f1r Wn cTl Philadelphia Pa San Antonio Tex Louisville Ky New York N Y Canada Minneapolis St Paul Minn Harnson Ohio San Francisco Cal Atlanta Ga Dartmouth Mass Jefferson Citv Mo Seattle Wash New York N Y Seattle Wash Los Angeles ...

Page 27: ...STATION LOG DATE AND TIME CALL LETTERS LOCATION FREQUENCY IN KILOCYCLES STATION SELECTORS LEFT HAND RIGHT HAND 26 ...

Page 28: ...carries a license under the patent claims of a but only for 1 talking machine uses 2 radio amateur uses 3 radio experimental uses and 4 radio broadcast reception and only where no business features are involved The sale does not carry a license under patent claims of b except only 1 for legitimate renewals and repairs in apparatus and systems already licensed for use under such patent claims on co...

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