| To ensure that every stage, however restricted the funds available, should have a switchboard capable of carrying out basic lighting cues, Strand Electric introduced in 1950 the Junior HA switchboard which has sold in thousands and which is still listed. However, Strand now offer an entirely new solution, the Junior 8. This is an extraordinary compact, lightweight control which can without alteration be used fixed or as a portable. Both the HA and the Junior 8 ensure that dimmers are not wasted for channels that are full-on or off. Thus 8 channels can be controlled from 4 dimmers which, as the dimmer is the most expensive component, effects a real economy. In the case of the Junior 8 the circuitry allows all eight channels to be switched to the dimmers for simultaneous fade-out or fade-in. Furthermore, all board channels terminate in socket outlets which allow lighting circuits to be "patched" in any order and permit circuit substitution at the control. |  Dimmers Direct operated |
For those who prefer a back of board dimmer with mechanical interlocking, the Junior 8 circuit is available as the Junior Interlock. In this case, the dimmers are grouped on two shafts each with their master wheel and they can be locked down by a simple twist of their handles. Boards can be used with 5-amp plug boxes to allow "patching" of circuits on the dimmers. Where a complete set of dimmers is preferred, a range of standard sizes is listed in two forms - Junior Sunset or heavy duty Senior Sunset.
Reproduced from Strand Electric Lighting for Entertainment brochure, 1963-4
| Lightweight composition formers with off and full-on contacts. Graded
resistance windings to dim-out any load between and including the wattages
stated. The operating knob to the copper-carbon brush is carried on an
external square rod which forms the plotting scale and masks the operating
slot. Internal terminals and conduit entry at base. Finish : Hard hammer blue and grey. Watts 200-250V Ref 100-120V Ref 250/500 545 575 500/1000 546 576 600/1200 547 577 1000/2000 548 - 1200/2400* 537 - 2600/3000* 538 -Add suffix /B for sheet metal back to Ref 545, 548, 575, 576. *Ref 537 and 538 have slate formers and external block at top. |
 1963/4 |
| The Junior 8 has eight channels each of 1kW maximum and four cordless
dimmers as an integral part. The 500/1000 Watt variable load dimmers are of the new design shown above. The single switch to each control channel (silent AC flush type) connects each channel to be "full on", "on dimmer" or "off" so that dimmers need not be wasted, yet all eight channels can be faded in or out simultaneously from the four dimmers. All eight channels terminated in 5-amp 3-pin B.S. socket outlets complete with plug tops (white for labelling) which allow light circuits to be "patched" in any order and permit circuit substitution at the control, i.e. more than eight circuits can be used from a single Junior 8. Channels can be grouped via, or independent of, the silent master blackout switch which has ample capacity to control three Junior 8 units. Slave units can be added at any time to make up sixteen or twenty-four channels. Each slave unit is complete with alternative number labels, linking terminals and connector bushes. Junior 8 controls can be used without modification either as permanent fixtures or as portable boards. They are light in weight and readily transportable without taking apart. |
 Junior 8 |
Ref 616 Standard Junior 8 model (Domestic type cartridge fuses to BS1362)
Ref 617 Slave unit to make up 16 or 24 channels
Ref 614 Master 8: This unit is similar to the Junior 8 except
that it is 8 inches taller to allow the provision of
larger wattage slider dimmers. The unit provides blackout
switch and two master dimmers intended to feed two Ref 617
Junior 8's and in addition two 1000/2000 watt dimmers with four
normal Junior 5-amp channels. All three units would be mounted
in line with the Ref 614 on the left.
Ref. 619 Master 3 - Three 400 watt max. short-rated master dimmers with
fuse and master switch, for series coneection to three Slave 8 units.
Ref 615 Senior 8: eight 5-amp channels and four 1000/2000 watt dimmers.
Ref 618 Spare 5-amp 3-pin white plugs for further circuits.
Note : Unless otherwise specified 500/1000 watt dimmers are always supplied.
Each individual Junior 8 single phase 200/250 volt A.C.only.
Supplied boxed with printed instruction book.
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| 500/1000 Watt new type slider dimmers are fitted with cords and plugs to allow them to be shared among double the number of channels. On-off switch, 2-way switch (B.O./Indep.), and cartridge type fuses to each channel. Terminals for load connections. Silent master blackout switch at right-hand end. A.C. Single phase 2-wire 220-250 volt, circuits not to exceed 1000 watts each. |  Junior HA12 Slider Board |
Type Description HA.8 8 channels and 4 dimmers fitted Frame JA... HA.12 12 channels and 6 dimmers fitted Frame JB HA.16 16 channels and 8 dimmers fitted Frame JA+JA HA.20 20 channels and 10 dimmers fitted Frame JA+JB HA.24 24 channels and 12 dimmers fitted Frame JB+JB Omission of a Ref.556 500/1000 watt or Ref.555 250/500 watt dimmer. Channel name engraved instead of channel number as standard. Sheet metal back to switch panel. Specify JA or JB frame.Back to Contents
| With 500/1000 watt "Sunset" Former type dimmers, or 1000/2000 watt "Sunset" Element type, with plotting scale, interlocking to a pair of master wheels. A cordless circuit allows these dimmers to be shared among a greater number of control channels which can all be switched to the dimmers for a simultaneous fade-out or fade-in. Each channel has a 2-way-and-off switch (on dimmer/full on), a B.S.1362 cartridge fuse and terminals for load connections. Totally enclosed with master blackout switch on right hand side. |  "Junior Interlock" dimmerboard |
Type Description Width Depth Height Weight
(ft./in) (ft./in) (ft./in) (cwt.)
JI/24 24 channels 1kW max.
sharing 12-500/1000 watt dimmers 3'2" 2'0" 5'0" 3
JI/30 30 channels; 28 1kW max.
sharing 14 x 500/1000 watt dimmers
plus 2 x 1000/2000 watt single
dimmer channels 4'0" 2'0" 5'0" 4
Variations Each dimmer increased to 1000/2000 watt sharing two 1kW channels.
Each 1000/2000 watt single dimmer channel to replace two 1kW channels.
5-amp plug boxes to enable circuits to be patched can be fitted.
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| Each channel has a 500/1000 watt "Sunset" Former type dimmer
with plotting scale and bracket handle interlocking to a pair of master
wheels except in models with suffix -/A where there is a separate master
to each row of dimmers. 2-way-and-off switch (B.O./Indep.) and a cartridge type fuse to each channel. Master Blackout switch. 220/250 volt A.C.only single or 3 phase. |
 "Junior Sunset" with side and back removed |
Type Description Width Depth Height Weight
(ft./in) (ft./in) (ft./in) (cwt.)
JS/N.18 18 dimmers in 3 rows 3'1" 3'4" 6'6" 7.5
JS/N.18A 18 dimmers in 3 rows 3'4" 3'4" 6'6" 7.5
JS/N.24 24 dimmers in 4 rows 3'1" 3'2" 7'3" 9
JS/N.24A 24 dimmers in 4 rows 3'4" 3'2" 7'3" 9
JS/W.24 24 dimmers in 3 rows 3'10" 3'4" 6'6" 8.5
JS/W.24/A 24 dimmers in 3 rows 4'1" 3'4" 6'6" 8.5
JS/W.32 32 dimmers in 4 rows 3'10" 3'4" 7'3" 10
JS/W.32/A 32 dimmers in 4 rows 4'1" 3'4" 7'3" 10
Variations : (limited by space and a 60 amp triple pole blackout switch).
Each dimmer increased to 1/2 kW including 10 amp switch and fuse.
Each extra 2-way-and-off 5 amp accessory circuit (JS/N 8 max; JS/W 12 max.).
Each dimmer and handle omitted.
Each switch and fuse omitted.
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| Heavy duty boards with Type A Element "Sunset" Dimmers to each circuit. Can be wound for loads up to 2500 watt fixed or 1000/2000 watt variable. Dimmer handles interlock to a pair of master wheels as standard or to separate wheels at the end of each row if specified. Cartridge fuse and 15 amp. 2-way-and-off switch (B.O./Indep.) to each way. Master blackout switch (A.C.only. 220-250 volt). |
Type Description Width Depth Height Weight
(ft./in) (ft./in) (ft./in) (cwt.)
SS/21 21 dimmers in 3 rows 4'0" 3'4" 6'7" 9
SS/27 27 dimmers in 3 rows 5'1" 3'4" 6'9" 12
SS/36 36 dimmers in 4 rows 5'1" 3'4" 8'0" 14
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| Robust construction with castors and carrying handles. Each channel is provided with a 500/1000 watt "Sunset" Former or 1000/2000 watt "Sunset" Element dimmer with plotting scale, which interlocks to a master wheel. A cartridge type fuse and a 2-way-and-off switch (B.O./Indep.) to each channel and the master blackout switch are mounted on a recessed panel provided with a lid. Terminals for the incoming supply and 15 amp 3 pin B.S. plugs and sockets for load connections. |
Width 45 inches Depth 24 inches Height 45 inches Weight 2.5 cwtBack to Contents
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