Tandberg TCD 310 Article 4

Page 1

'i a? M "l o n o

I Complies wilh DIN slandard 455041 equalized recording and playbatk

I Dolby noisnreduction syslem. instruments.

l3 motors, h leresis synthlonbus .llow Noise/Cvozlape swiwh.

Ilfligh qualilé heads make f ] use of

"the hump" p25. : w
[planking

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- J-n.)l cassette deck H7 (lie l/l-fl (lass

The TendbL-rg TCD 310 Slelco Is a lurthcr development
oi Ihe already iamous Tandberg my 300, a suecoss on
markets Ihlaughmil the world Several tests in Hi-fi
magdzrnes have ranked TCD 300 as a top model

The TCD 310 Stereo lully meets the DIN standards.
Grtal allunlion has been paid to lubnslnes: SD that IhE
deck WI continue to work perlcctly and Wl|hln the
speciiieatton after years oi regular hard use. This den
mands amongst other things that the number or moving
nulls is reduced In a mrnlmum, and this is made pos-
sible principally by the a motor tape drive system. At [he
some time all path must be solid and produced with
great precision.

The rco no is designed and produced in horway by
Tandbergs Rudiulabrikk AIS Wllh the same high regard
fol quality as all Tandbcrg products.

mt TAPE DRIVE SVSTEM

The dual (apslnn closed-loop tape-drive system employs
2 capstans with a precision rnade [lyrwheel and 2 pinch-
rullers. This Combination ensures stable tape handling
wilh minimum wnw and flutter r1nd eliminates the Ellen
oi irregularities in the cassettes The wow and flutter
speetliearion ttrril br- maintained alter years oi use, be-
cause the meshamsm has been designed to be really
solid. The tape tensron IS kept (onslanl and sideways
movement has been reduced to a minimum In {rent of
|he lterrds This prevents variations in the sound Dulptil
from lhe upc caused by the pressure pad in the car
sorts. The tape drive system is oi very simple construe
iron to avoid compllLdmd meshanisms that ran muse
wear and tear. irregular operation and poor parlor
mance

3 MOTORS

The Tandbcrg TCD 310 has 3 motors. one Synchronous
hysteresis motor Swill a constant laps speed [or record
in; and playback, .ln 2 servo DC motors ior last wind-
ing. The two Winding motors have direct cnnldcl With
the splndlu to avoid (amplicaled elutoli systems that
gradually wear out and result in irregular operation The
Wlndlng motors provide a very last smooth Winding
action (approx. 40 seconds tor a cop cassettel,

AUTOMATIC STOP

During record/playback and inst winding lunetrons the
driving mechanism is automatically released at the end
of the tape or if the (assent: fille The motors [Llln elf
automatically and the pinch rollers dlsengdge the tape.
this reduces the risk oi spoiling the tape.

THE RECORD/REPLAY HEADS

these are oi the highest standard and shosen for opu-
rntim compromise between top oualtty recording/plays
back and maximum lilc.

«LEV SVSVEM

e Tandbcrg TCD 3m Stereo leatures a bulllrln not
noise reduction system. This system reduces the tape
noise by about 10 dfl (umpared with conventional
systems. The Dolby system has Special advantages ior a
:asselle machine, because the tape noise is relatively
high owing to the narrow tape, thin magnetts coating
and low [ape speed, The Dolby system can be switched
on or oil. (See also special explanation ol' the Dolby
systoml

Purl READING MrrEits

The TCD 310 is equipped tvttli 2 large peak-reading
motors. A peak-reading indication is especially useful
when monitoring reUerings a most oi all mu§l( The
input volume is set by slide potenttometors. The meters
show correct recording volume tor all irequenctos and
have precislun states with a range extending up to + 5
dB Io suit the most modern tapes. The mc|crs also show
thu output playback signal.

TAPE SELECTOR

Thc magnetic heads and eleclrunlc (lrzults have been
designed to exploit the properties at the newest tapes.
The Lips seleniur can be set in two positions, either to
suit low notsr, high output tape, or to give optimum
results With chromium dioxide lCrOal two.

TECHNICAL SPECIFICATION

subject to improvement wllham notiee.

Dimmian' Breath |b'l.' MKS rmi. neighr wt" nos emr,
depth viii. t1.l errti

Weight: HS lh lbs ltgi

Power requirements: 130'l15 v, 50 or 50 Hz optional.

Power consumption: 34 with

rape speed 1'l. iris

Speed toierarite ivrtli nominal mains voltage and normal open
idling temperature. 1%.

Wow and flutter, max DlN ossii peak value but?! than
0.2%. Wotglrted ms better than 0.15%.

Playbadt enrreetionr Fur low n - high output iopo

1590 v120szorClOalape 1590 e 70 us

Freoueney rcspnnx: LH rapu CrOa tape
DIN 455: 30 to 13m) Hz 10 to Mint H1
: 2 d8 4!] to 12,500 H1 40 to 13500 Hz
Amplirrer mode

- 2 dB 30 to 16,000 Hz 30 to 16,000 Hz

signal/ape noise ratio: NORMAL D
[H 00: [H.Cerr

lEC, A (Lin/1', 1% dtsloitruri SI 43 54 dB 59 all tax dB
lEC, unweighted RMS, 3%

tiirlnrlion to on 50 dB 52 dlt 51 dB
DIN a551t.werghied 46 d8 49 dB 55 (IE 53 dB
DIN 4551i, unweighted 45 dB :8 dB so til! in dis

Crosstafli attenuziion at 1000 Hz From side 1 to side 2. more
than 6.0 dB From melt i to track 2 more than XS dB

rrorn record ampllllm at tr dB uswn
Ola/p at or; v rrorr. tape at 0 on

Distortion, mas
rrom pldybadt nmplilltl
record level 3%

inputs
Mic Sulublt tor dvnamic rnrcrophone with irrrpcdaoco less
than 7m ohms Senslttvuy u n my \tttx'lmtrm vnlldgu UO mv
UM input importance 110 k ohms Scmanlly 40 mV
Mixtmum \olhage i v.
RADIO input important: at k ohms sonsiuvtry o rrrv
Maxrmum voltage Us v
Output
RADtO lINE Minimum load lmpedanw to k ohrnt, Output
voliagc 0.77; v each thannel.
Transistors: 49 z pes m
Moto i hysteresis synchronous motor its v, 50/60 Hz

2 DC Wlndlng motors, is v

HOW VHI DOM $YHM REDUC YAPE NOISI

1hol>oloy r-lorsu reduttion system is urea in the moat advaneed
7(Cl'lurutl and ltlntlle marlrrnot rlre wall-m redtrtts rht~
tape noise essentially oirnput reducing the quality oi the pro.
gramme hclng rrcordcd This is .t great advantage in triniortn
inn tvrtb a litter, oeraute the litter redurr-s hotlt the tape
norso .irtd high Ireqniznues in the music.

the Dolby )ydem is based on llir last that tag» hm is mtl\lly
ht-arn in rlrtr tvnnk pass) es in the muSK when you lecord,
twat itissagcs in the nirddle and higher (requcnzy range rcr
.tnve t-rtra .nnplrittatron tit-ion» being mottled Tlietetore an
absolute improvement in the signal to noise ratio is athrctcd
ror lhcw ittak passages The weaker the passages. Illt- \Irrrrtgvr
tiit- arrtuiilttatron in playbatk thn volume oi the high Imthr
error» is damped io rhe orlglnal level The hiss irorn the tape
is rt-dtrrr-d in rlit- \rllm' lmrv and in the rural reprorlumi pro.
sum/no alt trtouerrrtus luvu th-lr torn-tr levels and the Line
lnss it mil damped in the steak passages oi the muur

it . TEA tr: , .r, .
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TANDBERGS RADIOFABRIKK A/S, OSLO 8, NORWAV J

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