Triangle Electric Co. Imperial Schematic

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Product Information:
Model:Imperial
Manufacturer:Triangle Electric Co. (Imperial)

Schematics Content:

Page 1:

REPLACEMENT PARTS LIST
WHEN ORDERING, USE PART NO. AND DESCRIPTION SHOWN ON THIS LIST REGARDLESS OF NUMBER PRINTED ON PART ITSELF.

Page 2:

ALIGNMENT PROCEDURE

PRELIMINARY
Output Meter Connections (Copper Oxide Type Meter) ... Across voice coil
Output Meter reading to indicate 1 Watt output ... 1.73 volts
Average Sensitivity in microvolts for 1 Watt output ... See chart below

Generator ground lead connection ... Receiver chassis
Dummy antenna value in series with generator output lead ... see chart below
Connection of generator output lead ... see chart below

Position of volume control ... Full on
Position of tone control ... OFF (or treble position)
Position of dial card at Maximum Capacity ... Max. Setting line

IMPORTANT ALIGNMENT NOTES

1. After adjusting the C4 oscillator padding condenser at 600 KC rotate dial back to 1400 KC and recheck the settings made on C35, C36, C37.

2. It will not be necessary to bend the plates of the variable condenser for alignment on other points on the dial.

3. It should be noted that after the receiver is installed in a car that it is not necessary, when preparing to align the set, to remove the control head and cables from the dash. There is a dial card on the variable condenser that will indicate the alignment frequencies and settings.

GENERAL INFORMATION

To examine this receiver for any reason first remove the two screws holding the cover. The speaker which is mounted on this cover will be removed at the same time allowing further inspection of the tubes and radio. The radio, being designed in two parts, having a pair of wire connectors from the chassis itself to the self contained power unit, can be removed from the case by first taking out the power unit.

The power unit has been very carefully designed to avoid any vibrator "Hash" from being picked up. Due to the exceptional sensitivity of the radio this interference must be kept at a minimum and it is advisable that the cover on the power unit be making good contact to the box. Tighten the cover by bending the flanges inward slightly. Also be sure that the .005 Mfd. 1600 volt condenser across the vibrator is not open.

It is important that the chassis and power unit make contact to the inside of the receiver case. In addition it is advisable that the paint be removed from under the various bolt heads on the outside of the case that are holding power unit.

Harmonics of the I.F. may be noticed when the chassis is being serviced outside its case. This is a normal condition and will not be present when the set is in actual use.

NOTED ON THE ELIMINATION OF UNUSUAL NOISE CONDITIONS OCCURRING IN THE INSTALLATION IN CERTAIN CARS ARE GIVEN IN SECTION IX OF THE INSTRUCTIONS THAT WERE SENT WITH THE RECEIVER.

Car interference can be fed into the receiver through the flexible control cables, and it is suggested that these cables be bonded. Also see page 6 to this instruction book regarding the use of a shield bracket mounted over the tuning shaft coupling on the set.

In some types of installations (Usually inverted mountings) some receiver may experience extreme loss of sensitivity. If the 2nd I.F. transformer (#6532 as shown on can) does not respond to alignment, it should be replaced with a new type. This condition in the I.F. transformer is caused by the position of the iron core being affected by heat generated within the chassis, and is usually indicated by the softening of the wax within the transformer. The new type I.F. transformer (Part #8542) eliminates this difficulty.

WHEN REPLACING THE 2ND I.F. UNIT FOR THE REASON AS DESCRIBED ABOVE, IT IS OF COURSE NECESSARY TO READJUST THE TRIMMERS TO 455 KC. WHEN MAKING THIS ADJUSTMENT ON THIS UNIT AND LIKEWISE WHEN RE-TRIMMING THE 1ST I.F. STAGE BE SURE NOT TO PULL THE PLATES TOGETHER TOO TIGHT AS THIS MAY BEND THE PLATES PERMANENTLY OUT OF SHAPE AND THEY WILL NOT SPRING BACK WHEN THE SCREW IS TURNED IN THE OTHER DIRECTION. IN THIS EVENT PEAKING OF THE TRIMMERS WOULD NOT BE OBTAINED AND THE UNIT WOULD HAVE TO BE REPLACED.

ADDITION OF SPECIAL TUNING CABLE SHIELD (3132) TO ELIMINATE EXCESSIVE IGNITION INTERFERENCE. IN MODEL HA6 SERIES 1.

In Ford 1936 V-8 and other automobiles where an excessive amount of ignition noise is present, the bracket described should be used in conjunction with a new type of shield (No. 3132). Both the bracket described and the new type shield described here are necessary for best noise elimination. The bracket and shield need not be ordered for models number above 5000 (series 2).

The new tuning cable shield (3132) will be supplied "No Charge" together with a screw used to fasten it over the tuning cable opening.

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