TUNING ASSEMBLY

De Wald 418
This model is the same as model 414 appearing on page 11-2 of Rider's Volume XI.

Electronic Laboratories 2811
This model, shown on page 16-8 of Rider's Volume XVI, uses the Webster model 56 record changer, which is shown on page RCD.CH.15-10 of Rider's Volume XV. Emerson BF - 169, BF - 204, And BF - 207
These models are the same as Model BF - 191 appearing on pages 9-1 and 9-2 of Rider's Volume IX.

Emerson 567, Chassis 120016
This model is the same as Model 560, Chassis 120016, appearing on pages 17-3 ) to 17-32 o Rider's Volume XVII.

FM Specialties Model Fidelotuner
This model is shown on pages 17-1 to 17-4 of Rider's Volume XVII. Three terminals are shown in Fig. 5, page 17-4; the first labelled 3, and the third terminal (not labelled in this figure) should be labelled 4. The ground from the phonograph connection to the receiver should be made to this third terminal (terminal 4). Farnsworth AC - 55, Chassis C2-3
This model is the same as model ACL 55, Chassis C 2-3, shown on pages 11-7 and 11-10 in Rider's Volume XI. Farnsworth ACL 55, ACL56, AKL58, AKL 59
These models shown on pages 11-7 and 11-10 of Rider's Volume XI are erroneously listed as ATL.

Farnsworth GK - 140
Slippage of the dial-drive cable on the early production sets can be corrected by replacing the cable with part number 05096. This cord is softer and smaller than the one used previously.
If the push buttons bind on the front panel of the cabinet, the ganged capacitor may not be properly positioned. This may be corrected by in stalling a flat metal washer under each of the mounting grommets. This may be done without removing the gang from the chassis.
Oscillation or low sensitivity on f.m. may be due to poor ground connections from the gang to the r-f shelf. When aligning the f-m banal, oscillation may occur with certain signal generators. Changing the value of the resistor in series between the generator and the chassis will prevent oscillation. With some generators more than 100 olims are required, with others less.
In some preliminary sets a 200 - umf capacitor was placed in series with the short-wave converter-trimmer. the

For any reason this trimmer requires replacement, removal of the capacitor is suggested. This capacitor is not shown on the schematic.
In some of the preliminary 14 - tube sets, Belden braid was used to ground the ganged capacitor to the r-f shelf. In certain instances too much solder allowed into the braid and as a result some joints brcak loose or the set becomes microphonic. This braid should be replaced with soft copper strips. General Electric A51, A56
These models are the same as model A54 shown on pages 7-4 thu 7-6 of Rider's Volume VII. General Electric H639AC - DC
The r-f alignment instructions of these models found on page 11-80 of Rider's Volume XI, should read as follows: With gang condenser plates completely meshed, set dial to the first mark at the left end of scale. Then set dial to 1500 kc. Apply a 1500 - kc signal either through a standard I.R.E. dummy to the antenna terminal or through an additional loop connected to the generator output which can be mag. netically coupled to the receiver Beam-a Scope. Align C2 and C1 at 1500 kc for maximum output. Set dial to 580 kc and peak C3 on 580 kc while rocking the gang con. denser. Retrim at 1500 kc. GE YRB 60-12
This receiver is the same electrically as the YRB 60-2 appearing on page 15.5 of Rider's Volume XV but the cabinet is different. GE YRB 92-2 and 81-3
These models are the same electrically as the YRB 82-1 appearing on pages 15-53 to 15.54 of Rider's Volume XV, but they have different cabinets. General Electric L604
This model is the same as Model 1600 appearing on page 13-40 of Rider's Volume XIII,

General Electric 202
This receiver is the same electrically as the model 200 as shown on pages 15-54 to 15-56 in Rider's Volume XV, except that it has a different cabinet. General Electric 219, 220,221
A few cases of hum which cannot be reduced in the normal manner from these models shown on pages 15-28 to 15-31 of Rider's Volume XV, may
be.corrected by cathode degeneration in the output tube, 35L6GT / G, cathode circuit. Remove R17 and C29 - C from the circuit. This can be done by disconnecting one end of R17. General Electric 260
This model appears on pages 1/7 to 10-19 of Rider's Volume XVI. It has been found that late production iLC6 tubes, coded H7E, will oscillate at another frequency in addition to the desired frequency, causing unsatisfactory operation. To remedy this condition, the oscillator grid capacitor, C17, should be changed from 100wyf to 56upf.

This model is illustrated on pages 16-3 to 16-5 of Rider's Volume XVI. The suffix letters after 254 indicate only the cabinet styling. All versions are electrically identical. Firestone 7402-4
This model is the same as model S7426-6 shown on page 10-5 of Rider's Volume X. Firestone 7423-5 This model is the same
as mode S7402-5 shown on page 13-38 of Rider's Volume XIII.

Goodrich R655W
This model uses the Admiral record changer model RC161 or RC161A, which are to be found on Admiral RCD. CH. pages 17-1 to 17-7 of Volume XVII.

Hallicrafters S - 40A
This model is the same as Model S - 40, second revision, on pages 15-67 to 15-86 of Rider's Volume XV, except for the fol. lowing changes. C18 has been changed in value from 100jf to 6uf. A thu - ohm resistor (R30) has been connected between the center tap of oscillator coil T10 and terminal C. R30 has been removed from its previous position between C16 and the junction of C26, C6C, C7C, and switch SIF. C55 has been changed in value from 100pf to 47uf, and is now connected to the top of the 470 - uuf capacitor (C54). The coil T17 is connected directly across C54, with one end going to ground. The center tap of this coil is connected to the cathode of the 6-8 tube. The 0.01 - uf capacitor (C53) is connected from the plate of the 6J8 tube directly to ground.
The parts list should be changed to read 99 follows:

Hallicrafters SP - 44 AND SX - 42
These models appear on pages 17-1 to 17-5 and 17-6 to 17-16 respectively of Rider's Volume XVII. When the SX - 42 is used with the SP - 44 Pana daptor on the low-frequency band, it appears to motor boat. To correct this condition, do the following.
The connecting cable between the SP - 44 and the SX - 42 is shielded and the shield is connected to the SX - 42 ground. Disconnect the shield from the SX - 42 ground and place a 50 - uuf capacitor between the shield and the SX - 42 chassis. Be sure that the SX - 42 chassis is well grounded. A shielded antenna lead, or a balanced antenna, on the SX - 42 may also help.
The following modifications should be made on the SP - 44 unit. A strip of bonding braid, 3/8 inch wide, may

Selenium rectifier output is 130 V.D.C.

NOTE: All voltage and measurements made with respect to chassis ground and with a line voltage of 116 V.A.C.

NOTE: All measurements were made with the tuned lines shorting bars in the lowest frequency position,

In order to operate, the following are necessary:
1. Antenna, (In most cases of local reception, the 4 ft. indoor antenna supplied will be sufficient.)
2. 105-130 volt 6u cycle A.C. power line.
3. A radio receiver, or separate phonograph, record player, or amplifier system.
All connections to and from the Fidelotuner are made to the terminal strip on the rear of the chassis.

CONNECTIONS FROM THE FIDELOTUNER TO THE RECEIVER
A shielded cable is supplied with the Fidelotuner for a simple connection from the Fidelotuner to your radio receiver, or separate phonograph, record player, or amplifier system.
You will find this cable already connected to the proper terminals on the Fidelotuner, these terminals being numbers 2 and 5.
The method of connecting the cable to the radio receiver will be determined by whether the receiver is (A) a combination radio-phonograph set, (B) a radio with a phonograph outlet only, (C) a radio without a phonograph or phonograph outlet.

A. COMBINATION RADIO RECEIVER - PHONOGRAPH
Look at the back of your radio receiver chassis for the phonograph terminal. (It will probably be marked PHONO or TELEVISION.) There are three different general types of phonograph terminals on standard radio receivers:
1. Screw-type Phono Terminal
In this type, disconnect any wires attached to the phono terminal. Mark the wires for later use.
Locate the high side of the phono terminal. Do this by turning the selector switch to phono position while the radio receiver is operating, and touching each of the phono terminal screws. The high side will produce speaker hum. (See Fig. 1). Now, to this high side, connect the center wire of the cable leading from the Fidelotuner. Next, connect the outside shielded wire of the cable to the other side (the low or grounded side) of the phono terminal.
In the event that the phono terminal has only one filet this will be the high side, and the center wire of the cable is to be connected to it. The outside shielded wire of the cable connects to the radio receiver chassis; it is best to solder this wire to the chassis. (Fig. 2).

2. One-hole Plug Type Phono Terminal (Fig. 3)
Pull out phono terminal plug, and disconnect the wires attached to the plug. Mark wires for later use.
Sofiter, or otherwise connect the center wire of the cable leading from the Fidelotuner, into the center prong (high side) of the plug. Next, connect the outside shielded wire of the cable to the outside shield cap (low side) of the plug. Then replace the plug into the single-hole phono terminal.

3. Two-hole Plug Type Phono Terminal (Fig. 4)
Pull out phono terminal plug, and disconnect wires attached to the plug. Mack wires for later use.
Solder, or otherwise securely connect center wire of cable leading from Fidelotuner, into one prong of the plug (making it the high side). Next, solder, or securely connect the outside shielded wire of the cable into the other prong (low side) of the plug. Then replace the plug into the phono terminal.

B. RADIO RECEIVER WITH PHONO OUTLET (without phonograph)
Follow the same directions as in A. (Connection to radio receiver with phonograph) except that there will be no phonograph leads to disconnect.

C. RADIO RECEIVER WITHOUT PHONO OUTLET OR PHONOGRAPH
In order to make this connection, the Fidelotuner has to be wired directly into your radio receiver circuit. A radio service man is needed for this installation.

CONNECTIONS FROM THE FIDELOTUNER TO A SEPARATE PHONOGRAPH, RECORD PLAYER, OR AMPLIFIER SYSTEM
If there is a phono terminal, the Fidelotuner can be connected by following the directions for connecting the Fidelotuner to a radio receiver. (See A. 1, 2, 3, above).
If there is no phono terminal, the connection will involve an installation which must be done by a radio service man.

CONNECTIONS FROM RADIO RECEIVER PHONOGRAPH TO FIDELOTUNER (Fig. 5)
Wires disconnected from the phonograph terminal of your radio receiver (the wires you marked for later use) are to be connected to the Fidelotuner.
To terminal # io of the Fidelotuner, connect the bigb side of the phonograph wire.
To terminal # lo of the Fidelotuner, connect the low side of the phonograph wire.
For normal operation of the phonograph in your combination radio-phonograph set, switch the Fidelotuner to OFF position.

ANTENNA CONNECTIONS
The Fidelotuner is supplied with a 4 ft. indoor antenna which is already connected to the #1 oscillator post on the terminal strip. Stretch this wire to its full length. For most city locations where F.M signals are fairly strong, this will suffice. If, however, your location is out of the primary service area, it will be necessary to use an outdoor li - M dipole equipped with a 300 ohm flat line lead-in. This antenna and lead-in is standard, and is easily ob. tainable from most radio supply stores. The outdoor connections should be made to terminis # oscillator and # 2, after the io ft. indoor connection has been disconnected.

Insulated alignment tools must be used for Fidelotuner alignment. Use a DC output meter with at least a 20 volt range, or a 20,000 ohm per volt meter. Use a signal generator covering frequencies of 10.7, 90 and 106 mc.
Before making any adjustments, let the Fidelotuner warm up for at least a half hour.