Drive-Ins.com
> > > >

1947-48 Theatre Catalog, 6th Edition, Page 285 (271)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 285
Page 285


1947-48 Theatre Catalog, 6th Edition, Page 285

black-out switches allow for a black-out to occur on either master circuit with no effect on the other. These master controls are shown in detail in Figure 6.

(5) To the right of the master control panel is the auxiliary control panel consisting of the following: (a) Momentary house light control for dimming house lights at a fixed speed; (b) an auto-transformer console louvre-light control; (c) a master black-out switch for blacking out the entire system; (d) a special constant circuit switch which operates a 15-amp. relay situated in the tube bank for the purpose of controlling special effects motors and so forth; and (e) a system master lock switch which cycles the closing of the primary and secondary power contactors to allow for a pre-heating time of 50 seconds for the tube filaments to reach operating temperature before application of the anode voltage.

The Tube Bank

The tube bank. measures 9 by 7 by 3 feet, and contains the following items.

A breaker-distributing panel situated at one end and connected to the individual receptacles in the wiring gutters into which are plugged the 44 electronic switching and dimming units.

A terminal strip situated at the opposite end of the tube bank where are terminated 44 pairs of N0. 22 wire which carry the pilot voltage from the control elements in the console to their counterparts in the tube bank. The other end of these wires are terminated in receptacles mounted within the control gutters into which are plugged the control plugs of the electronic switching and dimming units.

A transformer network which furnishes 18 volts of pilot voltage to the console and across which all pilot controls operate.

The primary power contactor which furnishes power to the tube filament transformer primaries which are situated in each individual electronic switching and dimming unit.

The master fader automatic drive mechanism and control amplifier (previously described).

Thirty-eight 1.5-kw. electronic switching and dimming units each complete in itself and containing one high vacuum tube and two inert-gas thyratrons which, being connected back to back, control both half-cycles of the a.c. input.

Six 6-kw. electronic switching and dimming units the control side of which are plugged into the gutters as shown. In addition, each contains an auxiliary transformer which is permanently connected to it through the anode and load gutter receptacles. The tube complement is the same as for the 1.5-kw. circuits. Each of the units also contains a single circuit adjustment which is to compensate for differences in, and aging of the circuit components. This is effected with a screw driver upon installation and about every 1,000 hours thereafter. An experimental unit has been observed in continuous operation for 5,000 hours with only minute changes in the dimming curve and no structural or component breakdowns have occurred There is every reason to believe that these units will operate satisfactorily for a period of time in excess of 10,000 hours before tube replacement should be necessary. In

1947-48 THEATRE CATALOG



WIRNG GUT 1"ng

LINE a. LOAD sum





6-Krw. .ELEQIBQN'C a SWITCHING I. DIMMING UNITS



WIRING CUTTER LIE It LOAD KISSES

AUXILIARY TRANSFORMER 6-K.W. UNITS ONLY

FIGURE 4-Schematic drawing of the tube bank shows the location of the wiring gutter with the control busses, the wiring gutter with the line and load husses, the auxiliary transformer for the S-kw. units only, the 1.5-kw. electronic switching and dimming units, and the 641w]. electronic switching and dimming units. This schematic drawing should be compared with the picture (Figure 3) of the tube bank.

FIGURE S-Block diagram of the system shows the relation of the console elements (see also Figures 1 and 2). the tube bank elements (see also Figures 3 and 4), and the on-stage elements. consisting of the stage-lighting loads. the stage outlets. and the cross-plugging panel. The system is unitized and is demountable unit-by-unit and control-hy-control from master rack and console, respectively. I



CONSOLE ELEMENTS



r

PI LOT VOLTAGE SUPPLY



3- 0 SUPPLY

MOTOR CWTROL AMPLIFIER



I SECONDARY POWE R



Icomuroa um" I TUBE 8AM I

L ELEMENTS m*-mmmmmmmm.l
1947-48 Theatre Catalog, 6th Edition, Page 285