L2042 Console - Ward-Beck Systems Preservation Society

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WBS L2O't2
AUD 10 CONSOLE
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WARD-BECK SYSTEMS LTD .
L2042
AUDIO
CONSOLE

[W'E1S]
WARD-BECK SYSTEM S LT D .
ElM ~55 AVENUE.~ ONTARIO M1H "" )( 4
TEC£X , OCS-ll"l:Jm ~ , "'61430-&500
~BS TYPE L2042 AUD IO CONSO LE
I. I NTR ODUCT I ON
t he Wa r d- Be ck Type L2042 Cons o le ha s be e n de s i gne d primarily
f or the br oadcas t production studio, providing max imum flex i ­
bility an d fa ci liti es a t mo de r-et e cost . There has been no
compromise i n the qua li ty and performa nce typica l of Ward-Bec k
Sys tems products in des igning t hi s console to meet the e xa ct i ng
requ irements o f t he medi um market tel e vision station.
Bal a nced circuitry is ut i lized t hr ougho ut t he cons ol e . in ~
elud i ng a l l inpu t s . i ns e rtions, a t t e nua t o r s , switching poin ts.
summin g buses . and outputs. Thi s r esults in low c rosstal k
figures and high RF immun ity not atta i nabl e wi t h y n b a l a n c ~ d
c i rc yi t t ~ c h n 1 q Y e s .
An in tegral j ackfleld prOVides access to all Input and bys
tns e r t t on poin t s , as well as

WARe-BECK SYSTEMS LTO.
L204 2 Audio Console Page 2
I I . SU MA RY OF FACILIT IES
20 Input cha nnels . consist i ng of a was ty pe M4 70 I nput
Module, M4 72 St at e Va rla bl e Equalizer, and Penny 5
Giles conducti ve pl astic fader. Each input May select
ei ther of two MIC sour ces or one LI NE sou rc e.
4 SubMa s ce r c hannels , co ns is ting of a IISS t ype M4 73
Sub.as t e r Module and Pe nny 5 Gil e s conductl ve plas t ic
fa der .
2 Master chann e l s . cons is t ing o f a WBS type M4 77
Ma ster Modu le .
2 Auxi liary c hanner s , utlllzlng a IISS ty pe M4 79
Dua l Auxi l ill ry Modu l e.
PFL (pre f ade listen) ~i xi ng bu s wltll wa s t ype M45 3
Cue Amplif ier and cons ol e mo unt ed speaker.
SOLO (post fa de) mhlng bus to permit a quality c hec k
of individual c he nne f s on the program monitor.
J Monltor outputs. con si sting of a was typ e M4 75 Monitor
Module per output. a nd an M4 78A 8 X 1 Sel ector Module.
Monitor channels a r e selectable t o all consol e outp ut
s i gna l s as we l l as e xte r na l Moni t or i nputs.
1 Mult i ple fre quen cy csc t tt e t c r , was t ype M452, wi th
out put f requencies fro. 20 He r tz to 20 .000 He r t z.
1 Talkbac k/slati n9 fa cil i t y . utlllzi ng a was type M451
Module. which provi des a slati ng s i gnal wit h 25 Hertz
to ne avail abl e on a j ack. and tal kbac k t o t he
auxi l iary buses . nd studio or announce Monitors.
7 'folullle indi c.tors. s ix on Main buses and one
s lll i tch.bl e :
SUB 1
SUB 2
SUB J
SUB 4
MA STE R I
MAS TER 2
AU '
I Integral jack f1eld. ut i l iz i ng ADt type PJJ39 j ac ks .
All In put and bus I nsertions, and a l l outpu ts a ppear
on tile jackf ield for ut il izati on of .nc i l lary dovi cos
i n th ese chann els by patching.

WAFlo·eE:CK SYSTEMS LTO.
L2042 Au d1 0 Console Page 3
3 Console power s upplies . incl udi ng two WBS type "62SA
Bi polar Power Supp11es fo r' all audio c t ec ut t ey , and
one WBS t ype " 624 Power Supply for la_p, rehy, end
tilly power. A pos itive , opera tor c en t r-ell ed tilly
.nd changeov e r' systeG 1s provided allowing either
M62SA to cl r ry t he entire console load in In e_ergency.
The follow1ng cp t t one t _odules Ind racn it1es • • y also be
acco__oda ted in t he L2042 console:
M451
M462
" 462A
M462B
"4 64
~ 466
"467
H478A
" 605
M612
M62l
4X2
Pre_Ix Module
State Variable Equalizer'
Sta te Va r i ab le Equalize r
State Var Iab le Equalizer'
High Pass/Low Pass r t l t e r
limite r'/Co_pressor
act s e Gate
eXl Sel ector
Ois t r i bution A.p l 1f1er
01s t r' 1but 10n Amp l 1f1e r
Honitor Ampl ifi e r
Mi crophone Tal ly and MUTE
In t e r l ock Circui t ry

WARD-BEC K S YSTEMS LTD .
L204 2 Aud io Consol e Pa ge 4
I l l . OP ERA TIO NAL FEAT URES
A. Input Cha nne l s
The L20 4 2 Audio Console ut i liz e s th e M4 7Q Cha nnel Ampl ifier
to provide the gain and s witching func tions f o r ea ch input
c ha nne l . The c o ns o l e may be fitted wit h a maximum o f twenty
such input modules .
Two Ml e an d one LINE source s are routed th r o ug h a pushbutton
i nput selector to the input transformer and prea mplifier. A
20 dB pa d may be i ns e r t ed into the mi crophone preamplifier to
a ccommodate the highe r leve l condenser microphone output range.
A preamplifi er SE NSI TI VIT Y control varies the ~a i n o f the
preamplifier over a 30 dB range. Th i s control ope r a t es on
all input ccnfi gurations - MI C, MI C PAD, and LINE.
A PHA SE c ont r o l push bu tton inverts the phas e o f a ny s i gnal
pass in g t h r c ugh t he M470 module . A red LEO indica t es when
a 180 degree phas e r eve rsa l is ta~ing pla ce .
The M470 preampl ifier p r c v i de s a high-pass fi lte r with th r ee
selectable freque nc ies . Depressing e ithe r o f t he two cont r o l
pushbuttons gives r oll - off f r e q ue nc i e s o f 70 a nd 100 He r t z
respectively. De pressing bo th pus hbu t t on s y i elds a 150 lI ertz
r oll -off.
An i nt e g r al pe a ~ i ndicati on ci rc uit i s p r ov i de d I n the M4 70
module. This circuit wi l l f l ash a n LED i ndIc a to r when s igna l
pea~ level s exceed a predeterm ined threshol d. The s ignal
leve l at wh i c h the p e a ~ i ndica to r fla shes ma y be vari ed o ve r
a ra nge from 0 to 28 dB ebcve nominal c ha nnel s igna l l e ve l .
A single conso le control is used to p reset the pea k i nd i ca t i on
level for all c ha nnel s.
PFL and SOLO pu s hb ut t ons prov i de individua l chan ne l mo nito r i ng
fu nc t i ons . I' FL (pre f a de lis t e n) r oute s the sel ected c ha nnel
to the conso le CUE spe a ke r . The PFL si gnal source i s de rived
before bo th the channe l ON pushbutton a nd c ha nnel f a der.
SO LO routes the selected chann el t o the conso le MONITOR- l
output, interrupting the signal s e l e c t e d by t he mo n i to r mod ul e
for as long as the chan ne l SOL O pushbutton is dep r ess e d . The
SOLO signal is derived after both the c ha nne l ON p us hbutton
an d c ha nne l f ad er.

WARO-BECK SYSTEMS LTO. l2042 A ~dio Conso l e Pa ge 5
The i npu t c hanne l us e s a Pe nny and Gil es c on duc t 1ve plas t ic
linear attenuator a s the c ha nne l fader . The P " G fader Is
noise free a nd I s r e c ogn ized fo r Its qu al i ty and reliab i li ty
t hro ugho u t th e worl d . r l f t een dB of "in-han d " gain i s
provided in e a c h fa de r .
An IllUMinated ch annel ON
channel , a s we l l as a pa ir
pushbutton is p rovided o n each
o f norMal led t nse r t t on j a c ks.
Output

WARD-BEC K SYSTEMS L T C. l 2042 Audi o Co nsole Page 6
Ho r e s ophis t i ca t ed equalizers fr om t he WBS H462 Series may
al s o be accommodate d i n the conso le fo r insert ion i nto i nput
or out put c ha nne ls by mea ns of t he co nso l e jackfi el d .
C. SUB HAST ER Ch a nne ls
The four SUB HAS TE R c hannels each utilize an H4 73 module
t o pro vide s umm i ng , ga i n , an d swi t chi ng fu nct i ons.
The SUB summi ng buse s e nt er t he ba l ance d s ummi ng ampli fie r
of t he H473 mod ule whi ch the n r outes the SUB sig nal t o a
pair of in se r tion jacks .
An il lumIn ated SUB ON pus hbutton is pro vided follo wed by a
P & G f ader. A SO LO pus hbutton is a lso provided. 15 dB
Of "i n- hand " gain is ava i la bl e in the f a de r .
The SUB ch annel has a direct output whi ch appea rs on the
co nsole jac kf ield and t he n on a t ermina l block at +B dBm.
A vol ume i ndicator i ndi cat es t he leve l of the SUB channel
output .
Each SUB channe l may be f ur th er as s 1gne d to eithe r of the
two HAS TER buses, uti liz ing a pushb utton switch wi th "barn
door " i ndica to r . SUB ass i gnme nt t o t he t wo AUXI LI ARY buses
is also provided via i ndiv idual assign ment pushb utt ons ,
PRE/POS T ~ ushb uttons, and l ev e l contro ls.
O. MAST ER Ch annel s
The t wo MA STER channe ls each util ize an M4 77 Haster Modu le
t o pro vide summin g.
The HA STER su mm i ng buses enter the balanced summing ampl1fler
of t he H477 mod ule wh 1ch then routes the MASTER s igna l to a
pai r of i nse r t ion j acks.
A HASTER volume-indicato r meters the leve l of each HA STER
outp ut. The HASTER leve l con trol is a rotary type , mounted
just under the HASTER me ter.
The HASTE R channels ha ve two t scl a ted outputs e ach wh i ch
ap pear on no rmall ed j ac k pairs. The first out put of ea ch
MASTER then proceeds direc t l y t o a termi nal blo ck whi le the
s econd outp ut of each MASTER fee ds an output LI NE selector .

WAI'=tO·SECK SYSTEMS LT O .
LZO~Z Audio Cons ol e P4ge 7
Two aultil iary Milli ng channel s , lIssfgnable from lIny input o r
SU B channel , are e r ev t eee . The AUX chl nne l s utilize an "~79
Mo dul e t o prO\lide s ummi ng , ga in , and contro l functi ons.
Additi onal conso le ~ i ~ e s fo r echo cha mbers. studio fo ldback
feeds, and effects or mus ic track s are typ1 cal uses of thes e
ch enne Is.
The master l evel control for each AUX channe l 1S on the 144 79
module. Each AU X Ch anne l pr oY i de s an outp ut at +6 d8m and
has a pai r of norma l l ed j ac ks 1n Its output circui t.
F. Moni tor Channels
Th r ee con so l e Mo nl tor channe ls are prov id ed designa t ed MON 1,
" ON 2. and HON 3. Each of the three c hanne t s are \l ery
slMfla r emp loying an "4 75 Monitor Module.
" ON 1 i s i nt ended f or us e as the pr1 Ma ry cont r ol r OOM Mo ni tor
bus and prO \l ides the SOLO fun cti on. The other tw o Mo nitor
buses May be used fo r control rOO M. studio, booth, or ottler
feeds a t t he CUStOMe rS discretion .
Each 144 75 modu le pro\lides a ~o nl to r se l ec t or . Mo nltor le\lel
control , SOl O/T B teve t contr ol . and MU TE pushbutton wl t h
indic"tor LED. The selector prov1des ttl e fo l l owing s ources:
ndj
, j
HI
M2
EXT 1
EX r 2
SEl
Ttle SEt pos ition of eactl 14475 s e l ec ts a COMmon s ub-se l ec tor
"~7 BA Modu le whlch pr ov ides the fo ll ow ing additi ona l Moni to r
sources:
.)
b )
oj
d)
, j
:1
51
52
53
54
h j
" s pare
s pare

WARD-BECK SYSTEMS LTD.
L2042 Aud io Co nsole Page B
Th e output level of th e M475 modules's +8 dB rq. Eac h mod ule
provides an 1nter nal switchi ng f unct i on , with f ro nt pan e l
l eve l cont ro l, wh1ch t s used fo r th e SOLO r unc t t on 1n t he
MON 1 out put , and for TALKBACK i ns ertion ' n th e other
mon1 t or cha nne ls . This featur e is programmable by the
customer. Eac h mo n1to r channel a l s o provides a MUT E funct i on
wi t h i ndica t or . whi ch may be ac ti va t ed either by a front
pa nel mounte d pus hbutton , or by an external closu re f rom an
intercom system, 11ne key. or the l ike.
G. Tal kback Fac11lt.'i
An M451 lal kbac k Modul e and conso le mount ed microp hone
prov'des TB and SL ATE func tlons . Fo ur pus hbuttons address
t he fo l lowi ng fa cilities :
1) SLATE
2) AUX 1
3) AUX 2
4 ) TB
The SLATE s igna l te rm inates on a j ac k a nd may be pa tc hed lnto
a channe l tns e r t t on . The SLATE sign al may be preset by the
operator to inc lude a 25 He rtz tone for high speed tape
i dentificatio n. Talkba c k to t he AUX 1 and 2 buses enables
communlcatlo n to a reas be i ng fed by these buses. The T8
output may be strapped to a ny mo nitor to f unc t l on on an
i nter rup t basis for ta l kbac k to a studio or hooth.
A fu l l - tlme outpu t f r om t he mlc ro phone. at +8 dBm level, Is
availabl e on a console termi na l block. for driving an external
l ntercom sys tem. The M4 5l mo dule also con tains an AGe
amplLtt ar- to mat nt at n unl form output. and a rotary level
cont rol t o se t the mlc galn .
H. Osci l l ator
The M452 Oscil la tor
provides t en test frequencies across t he
audi o ba nd (20. 30, 50 . 100, 400 . u . s e • 10k. 15k. and ZOk
Hertz) .
Three ou tputs from t he oscillator are pr-ovt deo , two termlnat
i ng on t he j ackfi eld (0 dBm and +8 dBm) and one terminating
on a terml nal block (-60 dBm) .

WAI=IC-BECK SYSTEMS LTO.
Ll 04l Aud i o Co nsole Page 9
1. Jackfield
Th e console prov ides a j a ckfield cons is ti ng of f iv e ro ws of
twen ty jacks eac h . All co ns ol e in serti ons appear on thi s
j ac kf i eld as wel l as all conso l e outp uts , a l l ow i ng the
insertion of any ancil la ry sig nal co ndition ing device . A
t otal of t en module slots are prov i ded which may be us ed f or
a wi de variety of an ci l lary modules - l i mite r / compr es s or s,
equal izers, filte rs, etc . Thes e de vices may l hen be patched
into any co nso le signa l path - i nput, bus, or output .
J. Power Sup plies
Th e console employes 11 t otal of t hree mod ul ar WBS power
supplies . Tw o M625A uni t s s upply power fo r all au di o
circuitry. Eac h supp ly ca rries abou t hal f of the co nso le
l oad a nd either powe r supp ly can be switched by the co nso le
operator to ca rry t he entire consol e in an eme rg ency.
The th ird su pply is an M6 l 4 wh i ch s upplies power
lamps an d r e l ays.
for conso l e
All suppli es may be plugge d i n or withdrawn from t he f r on t
of t he co nsol e .
K. Me chani cal
The conso le structure Is fabricated entirely from metal. The
console bas e i s a so lid wel ded stee l assembly, providing the
mount i ng area fo r t he pow er s upply fr ames as well as segmented
and enclosed cable entry ducts.
The mai n body sect ion us es al umi num end -b ells and alumin um
extrusions f or i nte rconnection and component , panel and
module moun ting . Capti ve nuts are employed within the
extrusions f or secu ring panels and modules.
Al l act i ve modul ar components a re accessible from t he front
of t he co ns ol e .
All pa nel surfaces utilize steel or aluminum for strength
and certai n meta l panel surfaces are covered with a pho t.o;
etched plastic esc utcheo n wi th epox y finiSh to provide a long
wea r i ng i de nti f icati on of cons ol e controls.

WAAC·BECK SYSTEMS LTC. l 2042 Audio Co nsole Page 10
Th e co nso le frame wi l l support its own we i ght i n any position
wh i ch f aci litates d1fficu1t i ns t all atio n passages wh e re the
co nsole may have to be pl aced "on end" . The console base
is r emov able t hus a l l oW1n g t he console t o be placed on i ts
"bac k" and pas s through a 30 i nc h wi de doo r frame.

WAAD-BECK SYSTEMS LTD .
L2042 Au di o Conso l e P~ge 11
IV.
SPECifiCATIO NS
'U C I NP UT S :
SOllrce I ll ped ~n ce :
I n pllt I llpedance :
I nput Leve l ;
150 o hlls ba lanc ed ~ n d f l o~t i n g.
10 tille source o r g rea t e r.
- 60 t o -10 dBII (cont. va ri abl e) .
HIGH LE VEL INPUT S ;
So ur c e Impeda nce :
In put Impedance :
Input Level:
600 o ~ ms balanced a nd floating.
301:. ohms.
-10 t o .20 da m (co nt . varia bl e) .
OUTPUTS :
l'Ia :d llu" l ev el a f t er
iso l a tion ne two r ks :
NOMin al level:
Load Imped ance:
t 24 ae .
-a dB .
600 enes .
fREQU ENCY
RES PO NSE;
Any Inpu t to a ny ou t pu t :
wit hin e t dB, 20 Hz to 20 ,000 Hz .
withi n !~ dB, 50 Hz to 15 , 00 0 Hz.
NOI se (Hi gh l e yel): a e t rer lhan BO dB be l ow Te s t leve l
(t1 8 d Bm ), 20 Hz t o 20 ,000 Hz
bandwi dth.
No r SE (low l e vel); Bette r t lla n - 125 dBm Equivalent
I npu t No i s e, 20 Hz t o 20 ,000 Hz
ba ndwi dth.
TOTAL HAR I'I ONI C 0 ISTORTION : Any prograll i nput to any progr aM
output, less than 0.251 Meuured
it t l B dBII output level , 50 Hz t o
15 kH z. (Typically below .04'1:
across MOst of bandwidth).
Any proqra lll fnpllt to a ny Mo n i tor
o r aUl(il hry ou tput , less t ha n
0. 51, Ileasur ed a t t 18 dBIl output
t evet , 50 Hz to 15 kH z.

WARD-BECK SYSTEMS LTC.
L2042 Audio Cons o l e Page 12
CROSSTA LK :
51gna 1 to crosstalk rati o t o be
greater than:
75 dB
70 dB
30 t o 10.000 Hertz
30 t o 15 ,000 Hertz
. e a s u r e d on any s 1g n. l pa t h through
the c o ns o l e , with s ignal fed to any
o t he r co ns o l e path . faders a nd
a tte nua t o r s of the . e asu r ed ind
driven pa t hs to be set t o l i t e
positions. (Typ i call y better than
6 dB below s pe cified va lues . )
HEAOR OOM :
( Wi t h no min a l 15 dB
in-hand at tcnua to r
setting)
J nput Stage :
Hi xi n9 Buses :
Outputs:
27 d B
27 dB
16 dB
POWE R RE QUIREH ENTS:
105 -125 volts ac, SO - 60 Hz, 300 VA.
o to 50 de g r ees Cels ius.
DI ME NSIONS; Width :
Depth:
He i gh t ( l e s s base ) :
Hei gh t (on base ) :
56.9 I nc hes
44 .5 i nc hes
28.5 inchu
4 1 . 5 i nc he s

WA~O ·"ECK S YSTEMS L T D . LZ04Z Audfo Console Page 13
STANDARD fUNCTIONAL DIA GRAM SYMBOL S
Audio Si gnll l
PlI th
Linear Fad er
Co nt r o l Signa l Pa th
Ro t a r y AttenUlItor
Nec hen t ce I
L1nklge
Stepped Attenuator
0>-_
r erntne t Block
Connection
Sc r ewd r i ve r
At t enue t or
Preset
XLR
Connector
Fixed Attenuator
( Pid)
AudiO J a c k
)(
Swi t c h or
Crosspoi nt
Horllilled Aud1 0
J a c k Pai r
Su... i ng o r
Mixing Bus

WA~O-BeCK SYSTeMS L T O . L2 042 AudIo Consol e Page 14
FRE QUENCY RESPO NSE CHA RAC TERISTIC S
"4 72 EQ UAL IZ ER MODU LE
M10 FREQ UENCY section
BOOS T/CU T: t IS dB.
FREQUEN CY: 0. 4 & 6.4
Q: 2 IJ, 4.
••
.•f-+-
••
••
••
,
-, f-,-+
-,
Id!: -1tH+
_.
HI GH FREQUENCY se ction
BOOST/ CUT: !IS dB.
FREQUENC Y: 10 l:H2.
LOW FREQUENCY section
BOOST/C UT; tIS ea.
FRE QUEN CY; 55 & 22 0 H2.
••
• •
••
••
-.
-.
-.1--
-.

WARD-BECK S YSTEM S LTD. L20 42 Audio Co nsol e Pa ge 15
WAR RA N T Y
All Ward- ll ec k Systems Ltd . pro ducts ar e wa r r ant ed ag ains t
de f ect i ve mater1als and work man sh i p for a pe riod of one
year from date of sh ipmen t .
War d- Be ck Systems w1 11 repair or repl ace, a t its option ,
wi t hout char~e, all said products or parts thereo f whi ch ,
upon f ac tory i nspec t io n , pro ve to be defec tive during t he
warr ant y period provided that:
e ) Original seria l numbers are intact and have not
bee n ta mpered wi t h,
b) The purchaser s hall r e t urn any equipment or
pa rts t hereof to Ward. Beck Systems only after
obtai n1ng prior a ut horization and s hipping
instructions From t he factory. Wa r d4Bc ck Systems
reser ves the righ t t o i nspect or r epa i r on the
purchaser's premises.
c) The purchaser assumes t he obligation of all
expenses i ncurred ; n connection With shfpping and
r e tu r n1ng s uch goods, once authorization has been
obtained.
This warran ty does not cover i te ms normally considered
expendable s uch as fu s es and lamps .
Th1s wa r ra nt y does not cover damages caused by misuse.
accident , neglect, una t hor l ze d alteration, repair by
unau t hor i zed personnel, or damage caused by act of God,
war or civil insurrect ion.
In no e ven t shall '1a r d4Beck Sys tems be liable for
co nsequent ia l damages . Ward-BeCk Systems Shall have the
r i ght of final determina tion as to the applicability of
this war ranty .
'1 ard· Bec k Systems reserves the right. at any time , to make
ch anges i n eq uipment. co mponent specifications and design
as may be wa rranted by progress in technology.
The wa r r an t y set forth he r e i n fs in lieu of all other
wa r rantie s , express or impl ied , including the warranties
of Me r ch ant ability and Fitness.

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