RCAVICTOR 6-HFT-1 User manual

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GENERAL INFORMAT ION
The RCA Models TR-l and TR-IA are mechanically and electrically alike except in the
volume control connections. In Model TR-l the volume control is used for recording level
only, while in the Model TR-IA the volume control is used during both recording and playback
operation.
These models are recording and pick-up units only and have to be connected to an ampli-
fier and speaker system to reproduce the recorded material. Two track recordingis ernployed
thus extending the playing time of a reel of recorded tape. Recordings may be made at speeds
of 3 3/4 inches per second or ? I/2 inches per second.
Using both tracks of the tape the recording time is as follows:
Size Reel 3 3/ 4,, Speed 7 L/ 2,, Speed
5" reel (600 ft. ) i hour I/ 2 hour
7 L/ 2" reel (1200 ft. ) 2 hours I hour
The RCA Models TR-l and TR-IA are designed to operate on IISVAC, 60 cycle only"
SUPPLIED BY:
RAD IO CORPORATION OF AMER ICA
RCA VICTOR RADIO AND "VICTROI-A'' DIVISION
CAMDEN 8, NEW JERSEY
GENERAL
flris moleriol compiled and published by
sAms & co., lNc., INDIANAPOIlS,
Copydghr 1957 . All Righb Rcrcrved
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HOWAR,D UY.
IIITE ll - 57 tolDtn 15

SPECIFICATIONS
Power Consumption:
90 watts at 115V. , 60 cy.
Recording Speeds:
3 3/ 4" per second.
7 L/ 2" per second.
Rewind Speed:
7" reel (1200 ft. ) - 40 seconds.
Frequency Response:
3 3/ 4 i.p. s. - 50 c.p. s. to 5000 c. p. s.
7 L/ 2 i.p. g. - 50 c.p. s. to 10000 c. p. s.
Flutter:
Less than 0.3%
Input:
Microphone - high impedance.
Radio/ Phono - high impedance.
Output:
High impedance - (Combined with
Phono" input).
OPERAT I NG I NSTRUCT IONS
Threading The Tape:
PAGE 2
FIGURE I
1. Insertthepower cord into a receptacle of the
proper rating.
2. Set control knob (23) in the "Stoprr position.
3. Remove reel retaining knobs (9) on spindles
by pushing down and turning counter-clockwise.
4. Place a reel of tape on the left hand spindle
and an empty reel on the right hand spindle.
5. Pull off about two feet of tape and thread it
around the toptape guide roller, then aroundthe lower
guide roller, over the erase head, between the shield
and record-playback head, between the capstan and
pressure roller, and then thread on the right hand
(empty) reel, and wind at least two full turns of tape
on to this reel.
Changing Speed:
Two sets of capstan pressure roller combina-
tions are provided with the unit. These are desig-
nated as follows:
3 3/ 4" per second - The smallest metal capstan
and largest rubber roller.
1 I/ 2" per second - The largest metal capstan
and smallest rubber roller.
"Radio/ To change speed unscrew the knurled thumb
screws and remove the capstan and pressure roller.
Becertain that the capstan and rubberpressure roller
are absolutely clean before attempting to put them on.
If dirt gets under the capstan it will not run true and
will result in WOW and flutter.
+2db.
-+ 2 db.

FIGURE 2
NOTE: Always use the longest of the two screws on
the metal capstan.
To Make A Recording:
1. Select and install capstan and pressure.
roller for desired speed.
2. Load tape as described under "Threading the
Tape".
3. Turn on the amplifier by turning the volume
control switch until a click is heard.
4. Place the "Record-Off-Playbackil switch in
the "Record" position. Allow the unit to warm up for
about 30 seconds.
5. Insert connector of a high impedance micro-
phone into the rrMicrt jack.
6. Start recording by turning "Rewind-Stop-
Forward" to "Forward" position.
?. Adjust recording level so that "eye" just
closes on the loudest notes of recording.
8. Recordings from a record changer, radio,
TV or tuner are made by connecting to the "Record/
Playback - Input/ Output" jack on the rear of the set.
After connecting, proceed as described above.
Dual Track Recording:
This unit only records on one-half of the tape"
To use the fulI tape, remove the reel from the right
hand reel when atl tape has been wound on it, place it
on theleft hand spindleand proceedas describedunder
"Threading The Tape".
To Rewind A Tape:
1. Before rewinding, lift the tape away from the
record head and place it above the head shield. This
prevents excessive wear of the head pole pieces.
2. Place the "Rewind-Stop-Forward" switch in
the "Rewind" position.
3. Rewinding may be stopped at any time by
turning the switch to the "Stop" position.
To Play Recordings:
1. Turn unit on with volume control knob.
2. Connect unit to amplifier and speaker.
3. Set the I'Record/ Playback. switch to t'Play-
back".
4. Setthe tape inMotion byturningthe "Rewind/
Forward" switch to "Forward".
5. Adjust the volume control for desired listening
leve1.
High Speed Forward:
l. When it is desirable to play a certain section
of the tape it is not necessary to play the entire tape.
By depressing the "Fast Forwald" knob the tape will
advance at a rapid speed, skipping several minutes of
playing time in a fevi seconds. When the desired sec-
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PAGE 3

tion is reached release the "Fast Forwardt'knob and
set the machine for normal playback.
To Edit And Splice Tape:
NOTE: It is impossible to edit and splice one track
of a tape without affecting the other track.
Therefore any recordings to be edited should
be limited to one track only.
l. The tape may be edi.ted by cutting out unvanted
sections, joining selections in another sequence, in-
serting announcements, etc. Unused sections can be
spliced together for reuse.
2. Forbest results, cut tapeat a slightdiagonal,
join ends together with splicing tape and cut off any
excessive width.
CAUTION: Do not use ordinary cellulose tape because
it will bleed through causing the tape to
stick together.
Erasing Recorded Material:
1. When a recording is being made the tape is
automatically erased on the track that is being re-
corded. The second half of the tape is not affected.
2. To erase a recording without recording new
material on the tape, proceed to record as normally
except turn the volume control completely down.
ADJUSTMENTS
Record/ Playback Head Adjustment:
The record-playback head is mounted to the
front panel by two scre\ps in a hinge arrangement.
Adjust as follows:
1. Thread an alignment tape into the unit as de-
scribed under "Threading The Taperr.
2. Connect an audio voltmeter or oscilloscope
to the output of the playback amplifier.
3. Playback a section of the alignment tape and
adjust the volume control until a convenient reading
ig obtained.
4. Again start the tape over the heads. While
observing the output reading adjust the left-hand head
mounting screw for maximum reading. When the
mildmum has been reached the head is properly
aligned.
NOTE: It is advisable to first loosen the left hand
screwto mal<e sure that when adjustingit will
pass through the maximum reading. Final
adjustment should leave the screw set for
maximum reading.
Hum Adjustment:
The record-playback head shield is adjusted to
reduce hum as follows:
l. Rockingthe head shieldwill produce anotice-
able variation in hum level.
2. Adjust the shield to the position which gives
PAGE 4
the lowest hum level, with the volume control set at
maximum, the unit stopped, no tape on the head, and
set in the "Playback[ position.
3. Realign the head alter the hum adjustment.
CAUTION: Neverlet the head cover drop on the head.
This not only affects the hum adjustment,
but also the head alignment.
Rewind And Take:Up Drag Adjustment:
Adjustments to the friction drag system are
measured by means of a 0 to I pound spring scale
fastened to string wound several times around the hub
of a ?" reel. Place the reel on the spindle to be ad-
justed and pull on the scale slowly until the reel re-
volves. Note the reading. The rewind drag should
be set at 3 to 4 ounces and the take-up drag at 6 to ?
ounces.
Adjustment is made by loosening the socket
head set screw in split nut (96) or (104) rotating the
split nut and tightening the set screw again before
measuring. Knurled nut (I04) adjusts rewind drag
and nut (96) adjusts take-up drag.
CLEAN ING
The head assemblies, pressure roller, and
capstan are subject to an accumulation of tape coating
residue, which is worn off the tape as it passes these
parts. Use a soft cloth dipped in carbon tetrachloride
to clean these parts, being careful not to saturate the
pressure roller and heads. Saturation of these parts
with carbon tetrachloride can canse damage to the
tape and oilite bearings.
CAUTION: Donot use a brushwhencleaning theheads
ae this could possibly mar the pole
surfaces.
LUBRICATION
Most bearings in this unit are of the porous
bronze (oitite) type that retain oil over long periods
of time. The bearings are kept damp by felt wick.
pads. Oil should be applied to the wicks, and not the
shafts or bearings. Use a good quality SAE #30 oil"
Motors:
Two or three drops on front and back bearings
every 6ix months.
Capstan ShaJt Bearings:
Two or three drops on felt pads every six
months.
Intermediate Idler Wheels:
One drop of oil on felt washers every six
months.
Take-Up Clutch And Rewind Brake:
Do not oil unless squeaking, then one or two
drops of oil on felt pads.

A PHOTOFACT'EXPLODED' VIEW
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FIGURE 3A. Exploded View 0f Parts Above The Front Panel
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F IGURE 38. Exploded View 0f Parts Below The Front Panel
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FIGURE 3C. Exploded View 0f Parts Below The Rear Panel
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FIGURE 4
MECHANICAL PARTS LIST
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Ref.
No. Part
No. Description
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2
3
4
5
6
7
8
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10
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15
16
1?
l1
L2
18
19
20
21
22
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20?859
20?855
20?861
207860
207856
20785?
207950
20?896
207947
207919
20?945
207852
207937
100776
207923
208456
208458
207q37
Screw, #4-32 x I/ 4"
Washer, Aluminum
Washer, Fiber
Roller, FIat, Guide
Spacer, Felt, Guide Roller
Washer, Guide Roller Asmy.
Shaft, Guide Roller
Spacer, Guide Roller
Retainer, Rewind Reel
Flange, Rewind Reel Asmy.,
With Set Screw
Screw, #8-32 x 5/ 8", Rewind
Motor
Screw, #8-32 x 3/ 8, Rewind
Motor
Screw, #2-56 x 3/ 4", Head
Mounting
Head, Erase, (PUz)
Spring, Recording Head
Adjusting
Button, Record-Playback
Safety
Knob, "Record-Off -Playback",
With Set Screws
Knob, Volume Control
Ilead, Record-Playback (PUl)
Jewel, Record Indicator Lamp
Socket, Record Indicator Lamg
Knob. Fast Forward
Ref.
No. Part No. Description
23
24
25
26
27
28
29
30
31
32
33
38
39
40
34
35
36
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42
A1
207938
20?910
20?853
207916
20?885
20791t
20?908
20?946
1007?6
20?894
20?901
100768
207924
20?854
20?868
100770
Knob, Rewind-Stop-Forward
Knob, Safety, With Shaft
Screw, #8 x 3y' 8"
Escutcheon, Magic Eye
Screw, Pressure Roller,
#4-36 x 5/ 16"
Roller, Pressure, 60 Cy,
7 I/2 - Sec.
Screw, Capstan, #4-36 x 3/ gt'
Capstan, 60 Cy, 7 I/ 2 - Sec.
Sieeve, Fast Forward Control
Knob, Equalizer Switch
Spind1e, Take-Up, And Bayone
Assembly
Spindle, Take-Up Spindle Nose
Panel, Control
Shield, Record-Playback Head
Roller, Guide (Flanged) With
Bearing
Spacer, Rewind Motor Mtg.
(Long)
Spacer, Rewind Motor Mtg.
(Short)
Nut, #8, Hex
Spacer, Rewind Motor Mtg.
(Short) With Rubber Bumper
Motor, Rewind, 115V" 60 Cy.
Spacer, Pawl Mtg. Bracket
Bracket. Pawl Mts-
PAGE 9

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PAGE II

MECHANICAL PARTS LIST (Con't.)
Ref,
No. Part
No. Description
44
45
46
41
48
49
50
5t
52
53
54
55
56
5?
58
59
60
61
62
63
64
65
66
6?
68
69
70
7L
72
?3
74
75
?6
77
?B
?9
80
81
82
83
84
85
86
8?
88
207902
20?89?
20?893
20?899
207898
20?881
20?88?
20?909
20?865
20?893
20?966
20?880
20?86?
208028
20?966
20?948
201928
201862
94353
207863
20?8?0
207872
20?871
20?913
207884
207813
100??2
20?906
100?86
20?930
207932
20?864
20?93r
20?936
201929
20't874
208030
20?866
208028
20?86?
20?875
Pawl, Rewind And Plate
Assembly
Hub, Rewind And Flange
Assembly
Screw, Pawl Bracket Mtg.
Washer, Feet, White
Bearing, Rewind Hub Ratchet
Ratchet, Rewind Hub
Washer, Felt, Grey
Shaft, Safety And Drive Lock
Pin
Spring, Pressure Arm Roller
Bearing, Cam Follower
Washer, Felt White
Plate, Idler Wheel Arm Asmy.
Spacer, Take Up Wheel Plate
Washer, Fiber
Wheel, Idler Drive
Plate, Idler Wheel Arm Asmy.
Lockwasher, Fast Forward
Control Arm Sleeve
Nut, flex, 1/LO - 20
Shaft, High Speed Forward
Control
Arm, Pressure, Assembly
Retainer
Plate, Pressure Arm Asmy"
Bearing, Capstan Shaft, (Front
Washer, FeIt, Oil Retainer
Fletainer, Capstan Shaft Bear-
ing (Front)
Washer, Capstan Spring
Bronze
Wheel, Capstan, Flywheel And
Shaft Assembly
Spring, Idler Wheel
Cam, Pressure Roller
Arm, Aetuator
Screw, #6-32 x 3/ 4"
Panel, Back
Lever, Fast Forward Control
Link, Wire, High Speed For-
ward (Long)
Shaft, Pressure Arm Assembll
Link, Wire, High Speed For-
ward (Short)
Spring, Fast Forward Control
Arm, High Speed Forward
Wheel And Bracket Asmy.
Washer, Red Fiber, Idler
Wheel
Wheel, High Speed Forward
Idler
Retainer, Hair Pin
Retainer, Hair Pin, Take-Up
Wheel
Wheel, Idler Take-Up
Washer, Fiber
Plate, Take-Up Wheel Arm
Ref.
No. Part No. Description
89
90
9l
92
93
94
95
96
9?
98
99
100
101
102
r03
104
105
106
107
108
109
i10
lll
112
lr3
r14
li5
116
l1?
r18
119
120
121
r22
123
124
125
126
r21
128
r29
130
t31
132
133
20?895
20?888
20?893
20?889
20?893
207892
20?891
20?890
2078?3
20?8?9
r008?9
20?903
20?893
207892
20?89r
207890
20?90?
2078?6
20?886
201877
2078?8
20?940
20?94r
207939
201944
201942
207943
100?88
20?8?1
207872
20?8?0
20?911
207949
20?951
Assembly
Housing, Take-Up, Assembly
Hub, Take-Up, Assembly
Washer, Felt, White
Wheel, Idler Take-Up Asmy.
Washer, Felt, 'vVhite
Wesher, Brass
Washer, Sponge
Locknut, With #8-32 x i/ 2*
Screw
Spring, Idler Wheel
Spacer, Take-Up Wheel Plate
Screw, #8-32 x 3/16"
Spring, Rewind Pawl
Washer, Felt, White
Washer, Brass
Washer, Sponge
Locknut, With #8-32 xI/ 2"
Screw
Spacer,Panel
Shaft, Switch And Cam Asmy.
Bracket, Switch Mountlng
Switch, Toggle DPST, Special
Lever
Arm, Switch And Pin Assembll
Bearing, Thrust, Assembly
Screw, l/4-20 x/2, Thrust
Adjusting
Screw, B. H. M. S. , Thrust
Housing
Spacer, Drive Motor Mtg.
Plate
Mounting, Shock, Rubber,
Drive Motor
Nut, #10, Motor Mtg.
Plate, Drive Motor Mtg.
Washer, Segment, Motor Mtg"
Washer, #10, Motor Mtg.
Nut, #8, Motor Mtg.
Motor, Drive
Fan, Motor Cooling
Panel, Side
Screw, #6, Take-Up Wheel
Arm And Plate Mtg.
Screw, #8 x lt', Motor Mtg.
Screw, #6-32 x 2", Idler
Wheel
Nut, Switch Mtg.
Retainer, Capstan Shaft Bear-
ing (Rear)
Washer, Bearing Oil Retaining
Bearing, Capstan Shaft (Bear)
Ball, Thrust Bearing
Retainer, Truarc, Record
Safety Button.
Capstan, 3 3/ 4" - Sec. 60 Cy.
(Not Shown)
Roller, Pressure, 3 3/ 4" -
Sec. . (Not Shown).
PAGE 12