Reelest C1A User manual

R:toro FACr* FolJ"*
Universal Electronics Sales Corp.
1500 Walnut Street
Philadelphia 2, Pennsylvania
Figure 1
Figure 2
GENERAL INFORMATION
The UNIVERSAL REELEST TAPE RECORDER is designed to magnetically
RECORD-REPRODUCE two paralleltracks in oppositedirection on L/4" wide
magnetic recording tape. The tapeoperates at aconstant speed of.7 L/2" per
second and is automatically reversed by means of a contact sticker which
must be applied to the tape. The machine f eatures manual and automatic
reverse and fast winding in either direction by operating two control levers.
Provision is made for ?" diameter reels which records or reproduces with-
out rethreading. The unit operates only on 115 V, 60 Cycles A. C.
Owners of Exclusive Sales Rights
UNIYERSAL MOULDED PRODUCTS CORPORATION
Electronics Division - Bristol, Virginia
REETEST
MODET CIA
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Made Under the Patent
Rights of the International
Electronics Company
* Trade Mark of Universal Moulded Products Corporation
fhis moferiol compiled ond published by
sAns & co., lNc., lNDlANAPoLlS, INDIANA
COPYRIGHT 1950 . ALL RIGHTS RESERVED
DATI 2 - 5l sET 123 tol0tR l3
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Figure 3
OPERATING INSTRUCTIONS
Before the unit can be placed into operation, the
red motor locking screw must be removed. This post
anchors the motor and separates precision ground
driving surfaces when machine is idle or being
carried. Replace this screw when recorder is not in
use and do not operate right-hand lever (16) to for-
ward position with screw in place.
Record-Play Head:
The ((Record-Play" head (25) is mounted in
such a maruler as to allow it to move up when tape is
traveling in the "Forward" direction, (from right to
left) and down when in '(Reverse,,, resulting in two
tracks of recording - one in each direction, one above
the other. This head (25) either plays or records, de-
pending on amplifier setting, or retracts for loading
or high speed rewind depending upon the position of
plav-record control (18).
Erase Heads:
The two outer heads Qa) ar e arranged in such
a manner that the right head erases the "upper,
forward track" and the left h e a d erases the "lower,
reverse track", The motor control lever (16)
automatically selects the correct head t o accomplish
any desired erasure. The erase heads a r e normally
energized only when the amplifier is in the "Record"
position.
Threading of Tape:
1. Turn the control knob (18) to the "Tape but"
or "Load or Rewind" position. This operation pivots
the right and left-hand erase heads (2a) and the
recording head (25) away f rom their play position.
This provides clearance for threading the tape.
2. Place a full reel of tape on the platform (5A)
in a position so that the tape will unwind in a clockwise
Page 2
direction. The coated side of the tapeshouldface
outward on the reel. The c o a t e d side of the tape is
the dull side of Plastic tape.
3. Pull the tape thr ough the slot between the
rear bezel (3) and the front bezel (10).
4, Place an empty reel on the takeup reel plat-
form (5) and feed the end of the tape up through one of
the slots in the reel. Hold the end of the tape and
rotate the reel, in a clockwise direction, four or five
revolutions. Make sure the coated side of the tape is
always facing outward and untwisted.
Recording;
1, To make a recordins, turn the control knob
(1S) to "Tape In" or "Playor Record" position. This
pivots the erase heads (24) and recording head (25)
into t h e i r normal playing position. Do not force this
knob for it is spring loaded to assume the proper
position as the motor is started.
2. Turn the control knob (16) to "Forward"
position. This startsthe unit and also moves the
recording head (25) to the upper half of the recording
tape. (a) The tape moves a t a fixed rate of speed
(7,\tt per second) past the recording head
(25) due to the position of the erase heads;
i.e., when the control knob (18) is set up
for t'Tape In" or "Play or Record".
The erase heads, in this position, hold
the tape in contact with capstan surface
which, as a result, sets up a positive
frictional condition between the tape and
capstan. Since the R. P. M. of the capstan
is much slower than that of the takeup
reel and its associated parts, the resist-
ance set up by the capstan causes the
diaphragm (?2) of the clutch assembly to
slip a corresponding amount. This

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Figure 4
accounts for the highspeed winding when
this friction condition is released at the
time the control knob (18) is turned to
the "Tape Out" or t'Load or Rewind"
Position.
(b) The Revers-A-Matic sticker is placed on
the back of the tape wherever the
customer desires; therefore, with the
unit operating in a forward position, the
metallic coating contacts the reversing
switch (15) and shorts it, This energizes
the solenoid which switches the mechan-
ism from "Forward" to t'Reverse".
Fast Speed Winding:
Fast speed winding may be accomplished by
turning the contr ol knob (18) to the "Tape Out" or
"Load or Rewind" position. This action removes the
drag set up between the tape and capstan (?) allowing
the clutch assembly to operate without slipping.
Reversing the direction of the tape at high speed may
be done at will without spillage of the tape. Non-spill-
ing of the tape is credited tothe brake assembly (102),
(104), and (112). Pressure is applied to clutch as-
semblies (?4), by the brake assembly, as the control
knob (16) passes the neutral or "Off" position when it
is switched f rom "Forward" to t'Reverse", or vice
versa. This neutral position of the control assembly
stops the reels instantly, preventing any overJun of the
reels. Because the braking action is applied to the
reels through the clutches, tape breakage is minimized.
To Repair or Slice Tape:
-
broken accidentally, or it is
desired to edit the recording, a splice may be made
special with "Scotch" S-41 Splicing tape. Do not use
medical adhesive tape as the adhesive material is not
suitable for this purpose. The "Scotch" Splicing tape
shouid be applied to the reverse, or uncoated, side of
the recording tape. To assure proper operation ot the
unit, the edges of the splice should be trimmed with a
small pair of scissors, or a knife, to bring the width
of the splice to that of the r e s t of the recording tape
or slightly less.
It is recommended not.to use a lubricated tape
as it may slip on the rubber capstan (?) causing
t'Wow" in the recorded sound, Consult your dealer
for a list of approved tapes.
Cleaning Recording Head:
After the recorder has been in use for some
time, the many thousands of feet o f tape passing over
the magnetic heads may have deposited a film of gum,
dustand dirt on the magnetizingsection. Thisfilm
will reduce the efficiency of the recorder.
To clean this f ilm f rom the three magnetic
heads, remove the three screws (2) and the housing
(3). Now, set the control lever (18) in position halfway
betwe en "Record or Play" and '(Load or Rewind."
This will place the recording magnet at the edge of the
slot. Moisten a clean cloth with carbon tetrachloride
and gently rub the surfaces of the recording heads.
The capstan tire surface should also be cleaned with
carbon tetrachloride, holding a moistened cloth
against the neoprene surface with the machine run-
ning. Replace housing and screws.
MECHANICAL OPERATION
AND ADIUSTMENTS
Forward Pulling Spring Adjustment:
The proper motor pressure applied to the main
drive wheel (96), when in the "Forward" position, is
adjusted by means of the "Flexloc" nut on the spade
screw (65), located on the cam follower assembly (63).
Measure this pressure with spring scale hooked on the
rear lip of the right-hand motor support bracket (40)
as close to the motor as possible. With the motor
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running in the "Forward" position, pull the spring
scale back until the capstan (7) slips; then read the
scale. Pressure ineasured with tape loaded and
running shouldbe 4l/2 to 5 lbs. Adjustthe ,,Flexloc,,
nut until the prooer pressure is obtained.
Rear Idler lVheel Adjustment:
With the motor running in ttReverse" direction,
the rear idler wheel and bracket (101) is adjusted by
loosening the two mounting screws (110A), figure 4,
and sliding the bracket to the I e f t (facing the rear of
ttte machine) until the cam follower (63) has approxi-
mately I/16't slack, The idler wheel must be
horizontally aligned with the main drive wheel (g6) for
properperformance. Be sure the adjusting screws
are tight af ter the adjustment is made; check to be
sure that rear idler wheel does not contact the
neoprene oil catcher on the motor shaft while operating.
Clutch Adjustment:
The clutch assemblies (diaphragm and hub
assemblies (?2), and clutch wheel (?4) slip relative to
each other due to the speed difference between the
capstan and the clutchassembly. The friction between
tape and capstan produces the drag forcing the clutch
to slip; however, when this f riction is removed bv
turning the control knob (1S) to "Tape Out", there
should be enough friction in the clutch assemblies to
drive the reels at high speed. The following procedure
is necessary to check and adjust the clutch assembly.
With the motor running, check the pressure of the
clutch with a spring scale hooked on to the reel at
approximately a 3 " radius and held at right angles to
the reel spoke. Comect adjustment should rcad, S l/2
to 4 l/2 oz, The clutch pressure is varied by adjust-
ing the "Flexloc" nut (85).
Br:ake Shoe Adjustment:
The brake shoes (102) must be adjusted to stop
the reels immediately when the control knob (16) is
placed in the neutral or "Off" position.
The brake shoes (102) are adjusted by loosening
the screw which secures them to the brake arm
assembly (112). With the machine in a neutral posi-
tion, move the brake shoe in to contact the clutch
wheel firmly; then tighten the screw.
Brake pressure applied to the clutch wheel
should be just enough to stop the r e e I s immediately;
too great a pressure may cause the shoes to drag on
the clutch wheels while in playing position.
Tape Level Adjustment:
With the tape loaded and running, and with the
contro.l knob (18) in the "Tape In" or '.play or
Record" position, the edge of the tape should run
approximately t/32ttabove the bottom edge of the
capstan rubber (?) in both directions. To adjust ilre
ppe position as required carefully bend the tape arms
(22) and (23) until proper adjustment is obtained.
Pressure Pads:
position ("Tape In" or "Play or Record"), and shoulo
be vertical and flat against the erase heads. .The
pressure pads are adjusted by loosening their mount-
ing screws (138) and rotating padsto correct position;
then tighten screws. If a high frequency mechanical
noise is heard when the tape i s running, this may be
oamped out by adding adhesive tape to the rear sur-
face of the pressure pad assembly (13).
Automatic Reverse Adjustment:
The solenoid (111) should be adjusted so that
the. machine -will cycle automatically, from "Forward"
to ttReverse", every time the reversing switch (15)
is acfuated. To adjust the solenoid, remove the power
plug, turn the controlknob (16) to "Forward"position,
and loosen the screws holding the solenoid bracket to
the mounting base. Adjust the solenoid so that the end
of the plunger isapproximately l/32t1 from the rubber
bumper on the end of the brake driving link; tighten
the screw.
The spring (80) and bracket (?8) must also be
adjusted properly to assure definite reversing opera-
tion. The spring and bracket, which hold the self-
energizing wheels (90) in contact with the clutch wheel
(?4), help to switchthe oscillatingbracket (BB). Adjust
the spring so that it is vertical i n respect to ilre head
lifting link (64) when the machine is in the "Off" posi-
tion. In late production, two of these springs (80) are
used. This is to give a more positive or definite
reversing action to the mechanism.
TROUBLES
Failure to Reverse Automatically:
1. Check power source 6,3 volts by shorting the
re_v.ersing switch (15). Short metal rings of the switch
(15) and listen for hum in solenoid (11{.
2. Excessive brake pressure. See ,,Brake Shoe
Adjustment".
3. Solenoid out of adjustment, thereby not
actuating thebrake dgiving link (104). See ,.Automatic
Reverse Adjustment".
.. 4. Spring (80) broken or out of adjustment. See
"Automatic Reverse Adjustment,,.
5. Check mechanism for binding parts.
Machine Shuts off at nng:l :gpS_Irylgqd of Reversing
1. Spring (44A) Ioose, thereby not pulling the
motor and bracketassembly around, leavingthe srvitch
in the neutral or "C)ff" position.
2. Check for binding parts.
3. Check metallic coating on back of tape.
Speed Variation or Wow:',
1. Check the motor shaft, driving wheels (g0),
clutch wheels (?4), main dr ive wheel (g6), and rear
idler (101), for oil and foreign material. Clean with
carbon tetrachloride.
2. Brake pressure adjustment too great. If this
is true, the brake shoes maydrag on the clutch wheels
(?4). See "Brake Shoe Adjustment".
The pressure pads (13)apply just enough
pressure to the tape to hold the m against the erase
heads (24). The pressure pads should be depressed
approximately t/8" when the mechanism is in playing
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Figure 5
3, Spring (108) loose, leaving the brake arm in
a forward position. If this condition exists, it may
allow the brake shoes to drag on the clutch wheels
(74). It also prevents the machine from winding at
high speed, producing a loud hum due to this drag.
4. Tape arm spring (?1) loose., If thi s is true,
the erase heads are not held in their play position,
which results in the tape not being held in constanl
contact with the capstan (T).
5. Spring (80) toose; this, a s a result, lessens
the pressure of the self-energizingwheels (g0) against
the clutch wheels.
Failure to Erase:
1. Tape arm spring (?1) Ioose. If this is true,
the laminations of the erase heads will n o t be held in
a positive position against the tape.
2. V/ith the taperunning inthe "Forward" posi-
tion, the top of the laminations on the right-hand erase
head should be level with top edge of the tape. The
top of- the recording head laminations (2b) should be
1/64" below the top of .the tape.
3. With the tape running in the "Reverse" posi-
tion, the bottom of the left-hancierasehead laminations
is level with the bottom of the tape. The recording
head in "Reverse" position should be L/G4t' above the
lower edge of the tape.
4. Pressure pads (13) out of adjustment. See
adjustment on ttPressure Pads".
5. Check resistance of erase head. . . should
be approximately 160 ohms. Check voltage source.
Failure to Record:
1. Tape arm spring (71) loose
Page 6
recording head (25) against tape.
2, Springofthe recording head bracket and
clamp assembly (58 and 59)broken.
3. Laminations on the recording head dirtv,
The taminations of the recording heao (2b) and the
erase heads (24) arc subject to an accumulation of
tape coating residue, which is worn off the tape as it
passes the heads. This must be periodically removed
since it will cause distortion. This accumulation may
be removed with carbon tetrachloride and a small
cotton swab on the end of a toothpick. Be careful not
to mar the laminations as they should be smooth to
operate prope-{ly. (See Paragraph on "Cleaning
Recording Head" ).
CAUTION: Do not tamper with the adjustment
of the Recording Head, as it is a critical adjustment
and has been corr ectly positioned at the time of
manufacture. If, however, headreplacement is neces-
sary refer to the following.
Replacement or Realignment of Record Head
The record-playback head in the pT-3 unit has
been adjusted at the f actory f or perfect alignment.
This assures that the gap in the head is perpendicular
to the edge of the tape and is parallel to face of the
tape and capstan.
If due to excessive w e a r of the contact surface
of the headlaminations, head replacementis indicated,
the headbeing symetrical f ront to back, maybe
removed and turned around 1800. This provides twice
the life of a single face head.
If a head is found to be open or shorted when
checked with an ohmmeter it must be replaced. V/ith
the red and black I e a d wires removed from head the
resistance of entire head (both coils) should be
approximately 160 ohms or 80 ohms from each
terminal to connecting link (one coil). No reading
not holding

To replace head, r e m ove red and black wires
from terminal panel on top of head. then remove 4
corner screws. Do not distrub 2 center screws as
they hold the head assembly together. If head is to be
furned around for use of r e a r side, remove piece of
metal cemented to back surf ace of head frame if
present. This is applied for hum bucking and must be
replaced on the rear of head after it ii reconnected
and adjusted.
New head or reversed head may now be placed
back on head platform and 4 screws replaced in
corner holes. Do not completely tighten these screws
at this time. Replace red and black teads to head
terminals. A tape with a b000 cycle tone recorded
precisely perpendicular to the edge must be used for
alignment. (this tape isavailable lrom Service Dept).
With alignment tape loaded in pT-3 machine in
normal manner and a suitable output meter in ampli_
fier circuit, the head must now be iocked from side to
side by means of the mounting screws. The head
platform has a raised dimple in the center and the
headwillmovefromsideto side and from front to
back by successively Ioosening and tightening the four
mounting screlvs. The output meter will read
maximum when the head is in exact line with the
recording onthe tape. When this isa attained the head
is- in perfect alignment and s c r e w s may be secured
with household cement to prevent any further move_
ment of the head.
Hum Bucking
This process minimizes the effect thatthe
magnetic field of the motor has on the recording head.
Hum bucking is accomplished by strategically locating
a small piece of Mu-metal on the rear side of the
recording head. Hum bucking should be done with
PT-3 unit, amplifier and power transformer in the
final operating position.
Procedure:
With the red motor positioning post i n place so
that the capstan does not turn, turn left hand control
knob (18) to "Play or Record" position. then turn
right hand knob (16) to "Reverse" position. The head
will be in i t s operating position without movement of
the capstan which might be damaged without tape.
Insert a suitable output meter across the speaker
so that a reading can be taken along with a liitening
test. If PT-3 tape recorder is used with a ClA
Reelest Amplifier, set volume control at the tap. The
+-ap can be located by finding the position of the control
where the tube hiss and hum are at a minimum in the
speaker and on the meter.
With the motor running hold Mu-metal piece flat
against the top casting of the record head just below
the terminal panel. Move Mu-metal piece back and
forth from the center gap in the lamination until the
hum in speaker and the outputmeter is at a minumum.
Cement Mu-metal piece at this place.
should exist from any terminal to frame.
Procedure: sufficient for a long period of time: however, due to
excessive use or high-operatingtemperatures, lubrica_
tion should be applied in the following manner:
Use Sta-Put on the Following:
1. Felt washer uncler reel nlatform.
V/ashers (51) and ballrace (OZ) ofthe capsran
shaft.
3. Cam roller and all sliding contact surfaces
of the cam (69) and cam follower (63).
4. Sliding contact a r e a s of the brake arm
sembly and all movable link assemblies.
5. Head lifting link guide bracket (b3).
Use Light Spindle Oil on the Following:
1. Head lifting bracket bearing (58).
2. Roller and shaft of the brake arm and roller
assembly.
3. F.elt pads (89) of the self-energizing idler
wheels (90). The felt pads on the clutch wheel face to
be lubricated with powdered graphite.
CAUTION: Avoid overlubrication; this may
cause parts to stick or failure of the machine to
operate properly.
Do not oil the motor shaft or any of the rubber
surfaces of the various wheels. Oil at these points
may cause speed variation or ,,Wows.,,
In summary, it is suggested that the following
procedure be followed for checking a pT-3 Recordei
mechanism:
1. With an amplifier properly connected to the
PT-3 unit supplying bias, erase, and solenoid volt-
ages.place a roll of tape on the right hand reel
platform and thread for proper operation.
2. Start machine by placing right hand lever in
forward position.
3. Stall right hand reel for check on capstan
driving power. Left hand lever should move forward
showing that the friction between capstan and tape is
correct. If left hand lever does not move, residue is
present on capstan and should be removed with carbon
tetrachloride or equivalent. Repeat above on left
hand reel with right hand lever in reverse.
4. If tape has a tendency to form a loop between
the capstan and the moving tape guides, iape is too
wide. Wide tape may be returned to dealer for credit.
An A. C. Vacuum tube voltmeter with high re-
sistance input should be used. (Vomax or equiialent)
A fibre padding screw driver should be used for ad-
justing. Oscillator padder is nearest 6SN? tube and
Erase padder is nearest 6V6 tube.
1. Turn oscillator padder and erase voltage
padder all the way in a clockwise direction, then back
off in a counter clockwise direction 4 or b turns. Re-
move front bezel and connect Vacuum tube Voltmeter
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LUBRICATION
Lubrication applied at time of manufacture is
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to recording head terminals which are on the extreme
left hand end of front terminal strip. The high side of
V. T. V. M" should be connected to the red lead" Use
120 V. A. C. sca1e.
Gradually rof ate oscillator padder cloclnvise
until meter starts to read. Continue turning padder
until a maximum reading is obtained. This is the
p r o p e r adjustrnent (approximately 90 V. A. C.). If
padder is turned beyond this point, oscill.ator voltage
will fall off and result in poor wave form.
Page B
2. Connect V. T. V. M. ground side to extreme
right hand terminal on terminal strip which is ground
side of erase circuit. Connect high side of V. T. V. M.
to yellow lead terminal. With right hand control lever
in either direction so that an erase head is connected
for a load, rotate erase padder clockrnrise. Orr the
300 volt ac scale, meter should read full 300 volts,

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ELECTRICAI- PARTS LIST
Item
No. Part No. Use and Description Item
No. Part
No. Use and Description
v1 I
v2 I
v3 I
v4 I
v5
v6
c1A
c18
c1c
clD
c2
c3
c4
c5
c6
c1
c8
c9
c10
c11
cl2
c13
ct4
c15
c16
c1?
c18
c19
c20
c2l
c22
R1
R2
46-6SQ?-MET
46-6sQ?-MET
46-6E5
46-6SN?-GT.
46-6V6-GT.
46-6x5-GT.
A38-1003-B
A38-1004-A
A38- 1 001
A38-1 001
A38- 1 001
3?-01 004000
39-00306400
3?- 00504400
3?-05004000
39-10206400
37- 00504400
3?-001 02000
3?- 00204000
37-01 004000
3?-01 004000
3?-030b2000
3?-001 02000
3?-1 0004000
39-1 0206400
39-1 0206400
3?- 001 09000
3?-05004000
A42-1003-B
A42-1004-B
6SQ?, Pre Amp.
6SQ?, 1st AF Amp,
6E5, Level Indicator
6SN?GT, 2nd AF Amp. -
Bias and Erase Osc.
6VOGT, Power Output
6X5GT, Rectifier
Filter, 30 Mfd @400 V.,
Electrolytic
Filter, 20 Mfd @ 350 V.,
Electrolytic
Filter, 10Mfd @350 V.,
Electrolytic
Output Cathode Bypass, 20
Mfd @ 250 V ., Electrolytic
Decoupling, 16 Mfd @ 300
V., Electrolytic
Pre Amp. Cathode Bypass,
25 Mfd @25 V., Electro-
lytic
1st AF Amp. Cattrode By-
pass, 25 Mfd @25 V.,
Electrolytic
2nd AF Amp, Cathode By-
pass, 25 Mfd @25 V.,
Electrolytic
Tone Compensation, 01 Mfd
@ 600 v.
Tone Compensation, 30 Mmf
@ 500 v.
Tone Compensation, .005
Mfd @ 600 v.
Audio Coupling, .05 Mfd @
400 v.
Tone Compensation, 200
Mfd @ 5oo v.
Tone Compensation, .005
Mfd @ 600 v.
Tone Compensation, 001
Mfd @ 600 v.
Tone Compensation, .002
Mfd @ 600 v.
Audio Coupling, .01 Mfd @
600 v.
Indicator Filter, .01 Mfd @
600 v.
2nd AF Amp. Cathode By-
pass, .03 Mfd @400 V.
2nd AF Amp. Plate Bypass,
.001 Mfd @600 v.
Audio Coupling, .1 Mfd @
400 v.
Oscillator Coupling, 500
Mfd @ 500 v.
Fixed Trimmer, 500 Mfd @
500 V.
Output Plate Bypass, .001
Mfd @ 1000 v.
Line Filter, .05 Mfd @
400 v.
Volume Control, 1 Meg.
Tone Control & On-Off
Switch, 2 Meg.
R3
R4
R5
R6
R?
R8
R9
Rl0
R11
R12
R13
R14
R15
R16
R17
Rl8
R19
R20
R21
F"22
R23
R24
R25
R26
R2?
R28
R29
R30
R31
T1
T2
sP1
sP2
L1
M1
M2
M3A
M3B
4t-3223540
4t-5413540
4t-5473540
41 - 51 03 540
4t-4t03240
41-5103540
4t-2413540
4t-4224540
4t-4223540
4L-3223540
41 -34?3540
4t-2473540
4r-4224540
41 - 51 03 540
41 - 5203540
41-6103540
41- 51 03540
41 - 51 03540
41-21 53540
41 -34?3540
4t-4103240
41-61 03540
41 - 51 53540
41 -34?3540
4t-4413540
4L-1414540
4l-2225540
41-t415540
4t-3225540
A43-1010-B
A43-1 011-B
836-1 004-C
836-1004-C
835-1004-1-C
A45-100?-C
A45-1008-C
A'40-1002
Tone Compensation, 22K,
l/2Watt
Series Phono Input, 4.?
Meg., 1/2 Watt
Series Radio Input, 4.? Meg.
l/2 Watt
Ext. Audio Shunt, 1 Meg.,
t/2 Watt
Ext. Audio Shunt, 100 K,
| /2 Watt
Pre Amp Grid, 1 Meg.,
| /2 WaIt
Pre Amp Cathode, 4?00
Ohms, L/2Watt
Pre Amp Plate, 220 K, 1
Watt
Tone Compensation, 220 K,
| /2 watt
Tone Compensation, 22 K,
| /2 Watt
Tone Compensation, 4? K,
t/2 Watt
1st AF Amp. Cathode, 4?00
Ohms, I/2Watt
1st AF Amp. Plate, 220 K,
1 Watt
Level Indicator Net, 1 Meg.,
l/2 watt
Voltage Divider, 2.2 Meg.,
I/2 Watt
Level Indicator Grid, 10
Meg.,l/2Watt
Level Indicator Grid, 1
Meg., 1,/2 Watt
2nd AF Amp. Grid, 1 Meg.,
t/2 Watt
2nd AF Amp. Cathode, 1500
Ohms, t/2Watt
2nd AF Amp. Plate, 47 K,
| /2 Watt
Isolation, 100K, 1/2 Watt
AF Voltage Divider, 10
Meg., t/2Watt
Vias Osc. Grid, 1.5 Meg.,
t/2.Watt
Voltage Dropping, 4? K,
t /2 Watt
Output Grid, 4?0 K, t/2
Watt
Output Cathode, 470 Ohms,
1 Watt
Filter, 2200 Ohms, 2 Watt
Filter, 4?0 Ohms, 2 Watt
Decoupling, 22 K, 2 Watt
Power Transformer
Output Trarisformer
Speakerr S PM
Cone, 3.8 Ohms Voice Coil
Bias Oscillator Coil
Switch, Record-Play
Switch, Mike- Phono-Radio -
Tape
Trimmer, 7.5 - 50 Mmf
Trimmer, ?.5 - 50 Mmf
Page 10

MECHANICAL PARTS LIST
Ref.
No. Part
No. Description
1
2
4
5
5A
6
1
o
I
10
11
l2
13
134.
138
14
15
15A
158
15C
15D
15E
16
17
18
19
20
20A
2l
22
23
24
25
26
21
28
to
29A
30
31
32
33
34
35
36
38
39
39A
40
4l
41A
42
43
44
44A
45
46
33- 1 042
1H1 0?96FA7
25- 141 5
25-1262
27-t034
21-1034
21-1004
27 -7054
21-1003
1810796FA?
25-1211
1H20525FA?
1H20525FA?
27-2088
33- 1 034
1H202?4FA-1
1tr20523FA-7
21 -2178
2t-1053
2t-t054
25-1420
2l-1026
33-1030
2L-t023
25-14t4
21-1023
25-1502
1H2452oFA-1
29-1004
27 -1028
27 -7046-L
27-t046
43-1 005
2H10564
1H2451 oFA1
2H1 0563
43- 1 006
25-7254
25-7414
25-1502
1H2452oFA1
29- 1 005
1H1 0245FA1
1H24256FA1
1H10618FA1
1H1 0611 FA1
25-1510
1H24258FA1
1Hl 0646FA1
27 -2103
25-140L
21-2083
25-1590
25-1382
25- 1 385
21 -1032
33-1 002
25-1383
33- 1 005
33-1 006
45- 1 005
1H24251I'A1
PIug Button-Bezel
Screw
Rear Bezel
Reel Retaining Screw
Reel Shaft & Platform Assy.
Reel Shaft & Pla$orm Assy. *
ReeI Shaft Washer
Capstan Assembly
Cork Washer
Screw
Front Bezel
Screw
Screw
Pressure Pad Assembly
Spacers
Screws
Motor Support Bracket Screws
Reversing Switch Assembly
(Added 2?-21?8'as service Pt.
No. Only)
Reversing Switch Base (Part
ol 27-2778)
Reversing Switch Post (Part of
2'.1 -2178)
Reversing Switch Washer (Part
ol 27-21781
Reversing Switch lnsulator (Part
ot 21-2178)
Reversing Switch Lug (Part of
27 -2118)
Control Knob (Two set Scresrs
Included)
Guide Post- Left Hand
Control. Knob
Nut
Lockwasher
Escutcheon - L. II. Kaob +
Motorboard Assembly
L- II. Tape Arm Assembly
R. H. Tape Arm Assembly
R. H, & L, H. Erase Head
Assembly
Screws for R. H. Erase Heads
Lockwasher for R. ll. & L. H.
Erase Heads
Screws for L. H. Erase Heads
Recording Head
Capstan Bearing Housing Ring
Spacer for Right Hand Erase
Head
Nut
Lockwasher
Escutcheon - R. H. Knob *
Screw
Lockwasher
Screw
Screw
Shipping Nut (Part of Motor
Assembly - Item 39)
No" 10 Lockwasher (Part of
Motor Assembly - Item 39)
No. 8-32 Screw (Part of Motor
Assembly - Item 39)
Mounting Plate Assembly (Part
of Motor Assembly - Item 39)
Spacer (Part of Motor Assembly
- Item 39)
Motor Assembly (Includes Items
34-35-36-3?-38-40-46-& 50)
Fan Assembly (Includine Set
Screw) r
Mounting Plate (Part of Motor
Assembly - Item 39)
Motor Support Wheel Shaft
Motor Support Wheel
Eairpin Clip
Motor Support Wheel Bracket
Cam Spring
Motor Spring
Motor switch
No. 8 Lockwasher (Part oI
Motor Assembly - Item 39) --
Ref.
No. Part No. Descripuon
47
48
49
50
51
52
52A
53
54
55
56
51
58
59
60
61
62
OJ
63A
64
65
66
6?
68
69
?0
11
12
to
14
75
?6
94
95
96
91
98
9BA
99
101
702
t02A
103
t04
105
106
10?
108
109
110
111
?8
?9
80
81
82
83
84
85
86
88
89
90
91
92
93
21 -1O55
25-1342
1H25849FE-6
1H20519FA1
25-1409
2l-102I
25-14L0
21-1003
25-L423
1H2425?FA1
1H20248FA1
1rr24256FAl
lH1 0615FA1
27-2047
27- 1 063
31-1008
33-1 040
33-1008
27- 1 058
25- 1450
2?-1 081
1H426?6FA1
33-1 032
1II25881 FE26
33- 1 004
21-2tO2
21-1004
33-1022
21-2107
1H25848FE6
21-1025
s3- i 002
27-1044
1H21297FA1
25-t464
1H24256FA1
33- 1 020
1H52148FA1
1rr242 56FA1
1H2129?FA1
25-1401
25-r4W
25- 1 381
27-1047
25- 13?8
21-1066
2?- I 039
21-1020
33-1002
21-tMO
33- 1 02?
21-1003
27-1024
25- 1 523
1H52581FA1
25-1562
25-1 509
2?-1 03?
25-t404
21-110?
27-zlv
21-1042
1tr25849FE6
33-1 032
33- 1 004
33-1 003
33- 1 046
27-1079
27 -1011
This part not shown in explbded
view.
Reel Shaft Housing Tripod
Motor Collar
Set Screw
No. 8-32 Hex Nut (Part of Motor
Assembly - Item 39) This part
not shown in exploded view.
Hardened Bearing Washers
Capstan Thrust Bearing
Bakelite Retainer
Ball Bearings
Cork Washer
Head Lifting Link Guide Bracket
Lockwasher
Nut
Lockwasher
Screw
Ilead Bracket & Clamp Assembly
Clamp Assembly (Part of Item
58)
Capstan Bushing
Truarc Retaining Ring
Head Retracting Spring (Part of
Item 76)
Cam Follower Assembly
Cam Follower Guide Post
Ilead Liltine Link
Spade Bolt
Nut
Set Screw
Hairpin Clip
Cam
Washer
Tape Arm Spring
Diaphragm & Hub Assembly
No. 6-32 Set Screw
Clutch Wheel Assembly
Halrpin Clip
Tape Arm Link & Spring
Assembly
Screw
Oscillating Bracket for Vertical
Spring
Lockwasher
Oscillating Bracket Return Spring
Plain Washer
Lbttwasher
Screw
Clutch Adjusting Nut
Clutch Aqjusting Nut
Self-Energizing Shaft
Self-Energizing Bracket - R. E,
Oscillating Bracket
Felt Washer (Put of 2?-1047)
Self-Energizing Wheel (Part of
21-L047)
Felt Washer (Part of 21-1c47)
Hairpin Clip (Part of 27-tM7)
Self-Energizing Bracket - L. H.
(Includes same parts as
27-1041 - Item 87)
Spring
Cork Washers
Main Drive Wheel Assenbly
Hub
Washer .266 I. D, x 1-314 O. D.
Fly wheel Ealves
Nut - Flexloc
Idler Wheel & Bracket Assembly
Brake Shoe - Metal (part of Item112)
Brake Shoe - Rubber (Part of
Item 112)
Brake Arm Support Assembly
Brake RolIer Assembly
Set Screw
Nut
Hairpin Clip
Brake Spring
Spring - Auxiliary
Bumper - Solenoid
Solenoid
3
Op
HE
eg
*Newly Added
Page 11