The RCA Model 85T2 is the same as the Model 85T except that in the former model either of two loudspeakers may be employed with the numbers stamped as follows: 84128-1 or 84128-2.

The RCA Model 112A is the same as the Model 112 except that resistor R15 in Model 112A is rated at 205 ohms. This resistor is located in the filament circuit of the RCA-1223 rectifier tube. The circuit diagram for Model 112 is found on page 4-58 of Rider's Volume IV.

REMLER MP5-5-3 In the schematic of this model, which appears on page 15-1 of Rider's Volume XV, the cathode of the 6V6GT output tube, pin 8, should be connected to ground.

SCOTT 800 - B
The instructions below are for installing an antenna coupling transformer for this receiver, data for which are shown on pages 15-30 to 15-90 in Rider's Vol For better reception of weak signals on the standard broadcast band in remotely located areas or in locations where the noise level is extremely high, an antenna coupling transformer is furnished which provides maximum signal input to the receiver for reception of stations on the standard broadcast band, The coupling transformer should be installed as follows:

1. Loosen the large screw in the lower left hand corner of the pushbutton tuning backplate at the rear of the receiver. This screw is located on the square backplate just above and to the left of the antenna terminals.

2. Slide the coupling transformer mounting bracket under the screw head and tighten down. The transformer should face toward the center of the back plate and will cover up the license plate.

3. Fasten the white wire from the trans former to the outside AM antenna terminal on the receiver.

4. Connect a short piece of wire between the center AM antenna terminal and the GND terminal and connect the black wire from the coupling transformer to the GND terminal of this strip.

5. Connect the antenna lead-in to the two terminals provided on the coupling transformer, clamping the wires between the two flat washers provided.

Stewart - Warner 9017 - A, B
These models are a later production of the 9017 - A shown on pages 15-49 to 15-52 of Rider's Volume XV. A 0.05-4f capacitor ( 61) part No. 502806, has been added from the avc bus ( low side of secondary of 1st i-f transformer 33) to B- ( cathode of the 12J5GT Osc. tube ). In some chassis of this model the short-wave Oscillator trimmer 28 was omitted in order to permit the use of gang capacitors with higher than normal capacity in the oscillator section. In these instances exact calibration is obtained without the use of the trimmer merely tune receiver to 20 - mc generator signal and adjust antenna trimmer 11.

Sonora RDU - 209
The service data appearing on page 15-2 of Rider's Volume XV also applies to this model.

TELETONE 117, 117A, 118,119 In the Teletone Models 117, 117A, 118,119 ( chassis series D) found on page 15-4 of Rider's Volume X1 the pin numbers for the 35Y+ rectifier are shown incorrectly. The correct pin numbers for this tube are illustrated in the accompanying figure.

Truetone D1645, Issue C
The following changes appear in receivers of this issue, the original issue being on page 15.1 of Rider's Volume XV: The 68 - puf capacitor C22 is now connected from the junction of R7 and R8 to ground and a 100 - jpf capacitor, C34, is connected from the other end of R8 to ground. The value of C32 is now 470 uuf instead of 330 f. C31, 0.004 uf is now connected from the plate of the 6VOGT Output tube to terminal 8, the cathode of this same tube, instead of between the place and terminal 3 of the speaker socket. A 0.2 - pf tubular capacitor, C35, part # D67204 has been added from the screen-grid of the 6V6GT out put tube to ground. The following parts are used in some receivers only. Check part number on old part before ordering and order part originally used in the set. 40X281 tone control ( substitute for 40X276 ); 25X1539 radio-phono switch lever, when 40X281 is issued; 2A161 d.p.d.c. switch when 40X281 is used.

TRUETONE DI 180 B
This model is similar to model D1180A, shown on pages 13-69 and 13-79 of Rider's Volume XP except for the fol lowing changes: The antenna trimmer ( C2 ), part number 17A123, mounted on the loop aerial assembly in the Issue " A " model, has been replaced by a " Gimmick " fixed capacitance, consisting of two wires, one wrapped around the other. The 1400 kc adjustment as given in the alignment procedure is omitted; this adjustment is made at the factory and need not be made in the field,

Watterson 4582
The alignment instructions for this receiver, the schematic of which appears on page 15-2 of Rider's Volume XV, were unavailable when the Manual went to press. They are as follows: I - F Alignment: Ser signal generator to 455 kc; connect its high side with a 0.1 uf capacitor in series to the grid of the 1A7 tube and the grounded side to the chassis. Tune the iron cores of the perm tuner so they are completely out of the coils. Use a small generator output. First, adjust the second i-f transformer for maximum output and then the first i-f transformer. Check to see that both transformers are adjusted for maximum output. R - F Alignment; Connect the high side of the signal generator ( with the capacitor removed) to the antenna lead ( blue) and the ground lead of the generator to the chassis ( black) lead. $ et volume control to maximum and see that the iron cores on perm tuner are all the way out of the coils. Set generator to 1650 kc and peak oscillator trimmer. 15-2 for trimmer locations. Then peak antenna trimmer for maximum output. Turn dial drive shaft until iron cores are completely inside coils; ser generator to 540 kc and adjust tracking core for maximum output. Recheck alignment at 1650 kc, making sure of maximum output.

Zenith Chassis 6C40
The On - Off switch of this set must be in the " Of position whenever the line plug is inserted into the changeover switch on the rear of the chassis. Failure to do this may cause flashing and possible burn out of the output tubes. In the event the set cuts out, the loop snap connectors may be sprung causing a poor contact; also there may be poor contact through the cabinet hinge. The letter " X " after the model number ( 6G001YX) indicates that an aluminum cabinet is used. The schematic diagram of this receiver will be found on page 15-30 of Rider's Volume XV.