Decca beau decca service manual

Page 1

DECCA
BEAU DECCA

High fidelity retort] repradiicer ca
fitted with Decca light-weigh! pickup witlx sapphire stylus, and six-
ampiifier, having triade push-[ml] mltpil! stage and feeding [ma three
8-itxr I'M loudspeakers. Negative feedback is inrorporated and 0
ed. A five-valve,
ll variable selectivity and magic-
for fitting into the

Ihree-puxitlmi tmle control pravid
radio unit, having two IF Stage: wit
eye tuning indicator, is available ax an extra,
console cabinet. Power fur the radii) chassis is obtained from the
amplificrllmit, which is designed tr) opera/e from ZOO-2501 50 (is
mains. Housed in handsome figured
round disperriart. Made by Data! Rat/i0 & Television, Ltd., 1-3

Brixton Road. London, SW9.

misting 0/ auto rez'nrd changer,

walnut cabinet with Ianver: for

'1 RADIO * SELEC VITY AND
VOLUME sumo OFF swrrc TUNNC

ADIO UnitrAn internal frame aerial L3 is
fitted for reception of [acid stations.

an external aerial is used the signal is fed through
C1 to SI and thence to coupling coils Ll (SW).
L4 (LW) and to tapping near bottom end of MW
tuned frame L3. The tuned coils L2 (SW),
1.3 (MW), LS (LW) are series connected, tuned by
VCl. and coupled to signal grid of V1 through C3l
Tl (SW), TZ (MW), T3 (LW) are trimmers.
short circuits L5 in MW Position and L3 L5 in

SW position.

AVC is applied to V1 through R], decoupled by

Cum inued overleaf

WAVE
CHANGE

CAPACITORS

. .l tubular 250v
.. Gflstllvermlca
.. ,1 tubular 350v

, .1 tubular 350v

.. S5pF silver mica
IBSPF silver mica
ISDF ceramic
saspr silver mica
.. 5.000pF silver mica
. WpF silver mica

N-comqemmw-

L AE 6:7 4,7
,La U U Cte ©©cn
cone We 1"
L2
6 Q) Q?)
T3 T2 TI

@036)

tubular 350V
tubular 350V
.l tubular 350V
,1 tubular 350V

.r ISDF silver mica
4 .. 49F ceramic

. i .l tubular 350V
. . .1 tubular 350V

Caz-J:- R22 rLcu

DECEMBER 1 948

figmgrwc so

RIO 553
CORE COPE cope Cis GE ©CI5

Lll @L9® 614 C54Q,© @032
c

l70pF silver mica

..|NTEP CHASSIS

"'7qu EECEcm/Frv AND RADIO
U NO ADIO on: sw VOLUMEJ
l C 1me _Ty M
Type 13 .. zzopr er mica 2 .OStubular3SDV
- i zoopr silver mica 18 .. 150pF mica

29 ,. lSOpF mica

,l tubular 350V
ZODpF silver mica
.01 Iubular 500V

200pF silver mica 33 .. :2 electrolytic 450V
20091: silver mm 34 .. 11 elscrrolyric 450v
zooprsilvermica RESISTORS ,
R Ohms Wan:
500K iw
36K iw
36K {w
680 +w
50K iw
120 iw
IOK iw
50K iw
[OK iw
9m iw
680 iw
500K iw
2 Meg {w
u gw
9m iw
10K
so§ Potmeter
1 es %
1 Meg kw
2.2 Meg 1w
1 Meg i
5K low
INDUCTORS
Ohms
lls
VEYY low,
425
17.5
23.5
.5
very low
.6
3.5
.i 1.25
.r 9.5
6.5 (from lap to
bot. end)
is . 200
m 5

Page 2

, \
jiflNEs .

-\ ,7... At
3 . 7|

your Service ..

to olimlnl't III thou Mrrlbl.
noises in la a Son caused bv
bid Cum-C's.

All you have to do Is to DIII a
low drops at srkvrsot on nil
Swlnhcs, Valve Pins, Holders»
ore-than are dozen: 9! them
-wmiou: any diimantnng. in.
Rum-nu drops lnst-nily
rlcapllon improves, Volume I
cicasls Ind wield-x dis-DDIII.
rIIC'. is no subxtl'uln In!

SERVISOL.

Ai supplied to the B. .0.. Radio
Manufacturers and all leading
Electrical Whaleialm.

toning}?

1 SI-. I-pinl tin with a spout.

. i
(l §\ Ne» trade.
// l'leoo 0/1769
lz/J _/ l4 ll/orI/l Jo/m Ifreet

J

LIVERPOOL 2

ALL-lN-ONE RADIOMETEII

with internal battery and multi scale the
PIFCO Ali-in-One Radiometer tests every-
thing electrical, Radio and P.A. Equi

merits. Household appliancfi of all kinds.
CarLighting Systems. Bell and TeleprinCer
Circuits. May be used on AC or DC mains.

I CIRCUIT YEST . LT. TEST O FLT. YIST
Test: (or o y- or M voluAC a! DC 0.140 vplts. Maybe
laulty eireuiu in all used due on any
radio and electrical Q MILLIAM'ERE mainl. AC or DC.
apparent: ma dum- T

em: ivplianees. 0/39 in, lellc for eVALve'res'r
Equally (or testinl (elem: total (14:. Made by Inserting
ear lilhzinl ma :harlelrom ham" vllve in suck on
surfing ("Cuini arrestinesinglecell. lmmolmmr.

erie {or full details and Export terms. Overseas Agency enquiries invited.

PIFCO LTD, PIFCO HOUSE, WATLING STREET, MANCHESTER. 4
.Ind at PIFCO HOUSE. 61'. EASTERN STREET, LONDON, E.c.1

vl

BEAU

GANG O
CONDENSE WW?
IN MAX
SADACITY VTUMNG
|
05 no 0 SDINDLE
Diildrivewith-anewndlnserin maximum C18. Cathode bias is provided by R4, CS.

Screen voltage is obtained from divider network

R2, R3, decoupled by C4. L12. C13, T7, forming

the primary of IFTl, are in the heliode anode

. , circuit of V1, the HT supply for which is decoupled

Apply signal as stated Tune T133513?" waking. ~ ted' t d d arallel

- . sci a or is connec in a une am e p -

below Receiver to Max. Output fed HT circuit. L7 (SW), L9 (MW), L11 (L_W)

(I) 5 kc/s to grid v3 _ 112, TH are the anode coils and S4 switches them to tuning

with VC2 short cir- capacitor VCZ and through C12 to osClllator

wind 211659190. iw anode ofVl. R8 is anode load, T4, T5, 0; and

°°°"' 105" 2 - T6, c7 are trimmers and C11. cplog, C8 gag]?

, . Grid reaction Volta as are develo on .

(z) 33 3f. $031 3"" °f _ 9 L8 (MW). L10 (LEW) and are switched by .53

through C6 and series limiter R6 to oscillator grid.
(3) 455 k/cs [0 grid of -- T8, 17 and ad- R5 is leak.

V' 5 35° J'Y-Islwle 0? L19 IF amplifier operates at 465 Kc/s. By cams
f. Paxmu attached to the shaft of SS, coupling between the
KEN-:10: or rimary and secondary windings of IFl'l and

8' ' y FTZ can be varied to provide four degrees of IF
4 18 m cs IOAE socket l8 mlcs T4 bandwidth.
( ) VIII/dummY 80ml L13. C14, T8, the swondaliig ofngl'kvlged Fig
i l rid offirst IF am i er . is e
(s) 15 iii/cs as above .. ls m/Cs TI and adjust fowgriff $hrough L13 and" decoupled by C1 8
:3: figggm; Cathode bias )5 obtained from R11, CH, and
and core L2 for screen voltage from R10, C16. L14, C19, T9, the
max. gain. Re, primary of iFl'Z, are in the anode circuit of V2,
pm (4) and (5) the HT supply for which is decoupled by R9, C15,
Secondary of IFIZ. tuned by C20. T10. feeds
signal tor grit;| of 11/3111? éecond Ifdag-iplgfg.
AVC is ed t rou an ecoupe y .
(7) soon/s as above .. 500 metres Cigcakg»(%°ia' cathode bias is 13% R14, C26 and screen voltage
by R15, C25. Ll6, C21, Til, the primary ol
(8) 333 k/cs as above .. 900 metres T6. T3 lF13, are in the anode circuit1 g1 3336 the HT supply
for which is decou led b R , .
(9) 7'9 V as be" '90 mm co L1" L5. , Automatic valuing cont¥oL The strapped diodes
w of V: are used for AVC. R13 is load resistor and

capacity position

TRIMMING INSTRUCTIONS

(6)1,5rn/csasabove ., 200 metres 15,12

VI-ECKJS V2-EF39 V3~5395 V4 -EB3¢ V5 ~EM34 U71 LET?
62 GA 63 G2 ISOV D2 DI Kl D2 0
.3ng a. Mi a, 735$ Lag? 5%. 1'53
Ah At A A 62 Di Al 93" L7
220v 70v 2ISV 205v ISOV 40v a2 14
l-lmA 27mA 3>|mA 4mA EmA 03 ' 40V
.mmA Llo Ll
H n H u u H N H u H L3 U
M K25V M x2v M K 3 M x2 M KOV 5 '4
,_n A V BLANK

TOPOXPGRIDI YOPCAPGRIDI TOP CAF GRID!

V6-EF37 V7-EF37 3-L63 V9 -FX4 VIO«234 Vii-SUG
62 35v cs 52 sov 53 A 390v
-25mA 425mm 5 G n M s '
A A A
43v 60V
H H H H HMH A A r
M «V M K4~5V K9SV 23%; 33% l 2)::

A A
TOPCAPGDID! ropcapealnl ems ACDOSS P44 52v DIALLANIPIG-av .3;

DECEM BER 1948