Grundig TK 2200 Schematic

Page 1

equipment reviews

GRUNDlG TK2200

MANUFACTURERS SPECIFICATION (9,5

cmls). Battery powered t-track tape recorder.
Frequency range: 40 Hz-ts kHz. Signal-to-
rtoise ratio: 47 d8. Wow and flutter: 10.25%.
Power supply: Six U2 cells or equivalent. or
TN12 mains power pack. Tape speeds: 9.5 and
4315 cmla. Spool capacity: 13 cm. Weight:
125 In Dimensions: 35 x 21 110.5 cm (I x w x h).
Priea:£96125tlncluding purchase tax. Manufac-
turer: Grundlg Warke GmbH, 851 Furth. Kurgar
tenstrasse 37. West Germany. Distributor:
Grundlg (Great Britain) Ltd., London 5.5.26.

HE upright styling of this machine has

allowed the loudspeaker to be placed on
one side of the case and the spools and drive
mechanism on the other. The controls are on
the top of the recorder and the batteries, or
power pack, are inserted by removing a slide
plate at the bottom of the case The tape
motion controls are rectangular press buttons
labelled stop, start, pause, wind and rewind.
with a round press button for record which is
locked down by simultaneous operation of the
start key. A threevdigit tape position indicator,
with press button reset. is conveniently placed
at the right hand end of the control area and
this is driven from the take-up reel with 10
toms of the reel clocking up 7 digits. At the
left hand of the panel is the playback volume
control which looks like a double edge operated
control, but the two drums are locked together.
The other control. on the other side of the
record level meter, is a true double control
with the front drum operating as record level
control and the rear one acting as playback tone
control-bass cut on clockwise rotation and

FIG. 2

9SCM/S

WSEMIS

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GRUNDlG TK2200 RECORD] PLAY WOW AND FLUTTER
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0 06']. MvdilehMVMerM.Mx-I «fV'VMJMwMm-MM'Aw

0'05". WvWNWVJ-VWWMN 'Wfiwx"

v' 1 t M! ' t , _ a ,
46',- fifw-""-ww~"v""'~'v L' V ' alex" V nvflwwnv; w .I¢M"i-/Vfvd N, VVy

.A JVNV.HA' _,v_rt,._vJ-\~m/v\.vi-.;«V~\~ i=~,\\w,¢3¢\WWn;.

l srcmm l

.1«'t -.

Sill

20 SI ")0 200

FIG. 3 GRUNDIG TK2200 PLAY ONLY RESPONSE nest in: ll urr Imun

llEdlliICY I! ll:

til/5 my! 9 Illllyl

llJDO 1K llll 16K

treble cut on anticlockwise rotation from a
central level-response position.

Full wind or rewind of a 13 cm reel of LP
tape (900 ft) took a fraction over two minutes
in either direction, but wind or rewind on to a
nearly full reel was rather sluggish and some.
times needed a helping hand to get things
moving.

Long term tape speed was constant from
beginning to end of reel but the mean speed
at 9.5 cm/s was nearly 2% fast and is therefore

Sll

FlG. 4 GRUNDlG (2200 RECORDIPLAY RESPONSE lull: II N UK fllllflll

Fltllllflfl IQ ltx '

ISCMIS

L'TSCH/S

1000 1 SI l0! NI

near the top limit at this speed At 4.75 chS
the speed was 1.4% fast. This is one of the few
recorders where the speeds car: be adjusted by
presets in the motor control electronics. but
l will leave Mrs Hellyer to sort out the exact
procedure in his excellent service notes.

Short term speed fluctuations were extremely
small as will be seen by the fluttergrams of
fig. 2. T he meter readings were very steady
and it was not possible to phase the record and
play cyclical speed variations to build up a
steady high value This shows that the speed
fluctuations are fairly random in nature so
that cumulative record-play adding is unlikely.
A low wow and flutter test tape also read
006 3/. RMS at 9.5 cm/st At the lower speed, a
1.5 Hz wow canjust be seen on the top trace,
giving a cumulative reading of 1.6% FMS.
This is much lower than the capstan rotation
frequency and is probably due to a slightly
eccentric pressure roller.

The contra-rotating flywheels seem to be
effective in maintaining a constant tape speed
despite severe agitation of the recorder.
Shaking the recorder with a twisting motion in
the plane ol the flywheels, so that the take-up

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