Magnecord PT6-6 Series Operating instructions

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Service-InstructionM
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Figure 1. RearView of TapeTransport.
GENERALINFORMATION
The ‘Magnecord” Model PT6-6A Tape Recorder
is designed for use with the “Magnecord” Amplifier
Model PT6-6J.
The “Magnecord” Model PT6-6A Tape Recorder
features Stop, Forward, Fast Forward, and Rewind
modes of operation by merely turning a knob. Play-
back or Record is selected by switch on PT6-6J
Amplifier. Any reel up to 7 inches can be used. New
recordings can be made on previously recorded tape,
since erase head is automatically connected when
switch on amplifier is in “Record” position.
Tape Speed Switch on PT6-6A will change speed
from 15 ips (FAST position) to 7 l/2 ips (SLOW posi-
tion) when 15 ips capstan and pressure roller (large
capstan and small pressure roller) are used. Speeds
will be 7 l/2 ips (FAST position) and 3 3/4 ips (SLOW
position) when 7 l/2 ips capstan and pressure roller
(small capstan and large pressure roller) are used.
SPECIFICATIONSPT6-6ATAPETRANSPORT
Tape Speeds - 3 3/4 ips, ‘7 l/2 ips, and 15 ips are
interchangeable with no tools required. Tape speed
selection is made by switch and/or change of capstan
and pressure roller.
Rewind Speed - 1200 ft. of tape (full ?-inch reel) re-
wound in 40 seconds.
Flutter - Less than 0.3%.
Tube - Bias Oscillator tube 12AU7.
Motors - 1500 RPM rewind motor. Hysteresis Syn-
chronous 2 speed, 900 RPM and 1800 RPM, drive
motor.
Frequency Response - 50to 7500 cps with tape speed
of 7 l/2 ips, 40 to 15,000 cps at tape speed of 15 ips.
SPECIFICATIONSPT6-JORPT6-6JAMPLIFIER
Frequency Response - 50 to 15KC, f 2 db equalized
for tape speeds of 7 l/2 and 15 ips. 3 3/4 and 7 l/2
ins equalizer available.
Input Level - Sensitivity -105 dbm for zero level re-
cording.
Maximum Level - 35 dbm.
Input Impedance - 50 or 250 ohms, balanced or un-
balanced. High impedance unbalanced bridge (Phone
Jack).
Noise - 65 millivolts maximum at 600-ohm output
(switch at “AMP”); 20 millivolts maximum at 600-
ohm output (switch at “PLAYBACK”). Ret-PB over-
all signal-to-noise ratio 50 db from 3% third harmonic
distortion point.
Total Harmonic Distortion -- Less than 2% with 10
watts output.
Output Impedance - 600 ohms balanced, 16 and 4 ohms.
Output -- 10 watts with less than 2% distortion.

Figure 2. View of Right Sideof TapeTransport.
Tubes - (1) Type 5879
(1) Type 12SJ7
(lj Type ~SL?
(2) Type 5881
(1) Type 5Y3
Dimensions - Amplifier; 8” deep, 7” high, 19” wide
without carrying case. 13” deep, 8” high, 20” wide
with carrying case. Transport Mechanism; ll”deep,
7” high, 19” wide without carrying case. 16” deep,
8” high, 20” wide with carrying case.
Weight - Amplifier; 20 lbs. without carrying case,
34 lbs. with carrying case. Transport mechanism;
26 lbs. without carrying case, 40 Ibs. with carrying
case.
INSTALLATION
PT6-6A and PT6-6J units may be mounted in
portable cases ‘or standard 19” racks without adapter
panels.
OPERATINGINSTRUCTIONS
PT6-6A motors and oscillator tube receive their
power through male Jones connector on rear of unit.
See schematic for terminal designation. This power
is supplied by Magnecorder PT6-6 Jamplifier. Female
Cannon connector on rear of PT6-6A is connected to
male Cannon connector on rear of PT6-6 Jamplifier by
an interconnecting cable. This cable couples Record-
Reproduce head of transport mechanism to the play-
back amplifier input in the playback mode, and couples
the output of the Record amplifier to the Record-
Reproduce head in the record mode.
1. Make sure oscillator tube located in rear and
at right side is secure in its socket.
2. Set control knob (30) to STOP.
3. Make sure correct capstan andpressure rol-
ler for desired speed and knurled retaining screws
are firmly in place. For speed and speed changts see
“General Information”, page 2. Make sure taper-
shaped capstan shaft is completely free from dirt or
foreign particles before installing capstan,
Threading the Tape
1. Before a reel of tape can be placed on spindle,
reel retaining knob (1) must be removed. To remove
reel knob, push in and turn counterclockwise to re-
lease bayonet pin.
2. Place empty reel on take-up spindle (36), and
replace reel retaining knob (1).
3. Place a reel of tape on rewind spindle (2),
withtape paying off in clockwise direction, and replace
reel retaining knob (1).
4. Pull off about 2 ft. of tape, thread over and
around top tape guide roller (23), then around lower
tape guide roller (9), over erase head (15), and Record-
Playback head (29), between capstan (33) and pressure
roller (35). Then thread on right hand empty reel.
Make sure oxide coating on tape is toward heads. See
illustration on front cover.
Page3

Figure 3. BottomView of TapeTransport.
ToMakea Recording
1. Flip power switch, on amplifier being used,
to “ON”. This provides necessary power for both
amplifier and recorder mechanism.
2. Turn selector switch on amplifier to “Record”
position.
3. Push VU meter switch in to connect meter,
if PT6-6J amplifier is used with PT6-6A tape trans-
port mechanism.
4. For headphone monitoring, insert plug of
phones in amplifier front panel Monitor Jack. For
speaker monitoring, turn speaker volume control up
to desired position.
5. Vary volume level with Gain Control. Turn-
ing control clockwise increases amplifier gain. VU
meter should move with program material and should
read a peak value of “0” once every few seconds to a
minute, depending upon nature of program being
recorded.
6. To place tape transport mechanism in ‘Re-
cord” position, depress safety button (19) and simul-
taneously turn control knob (30) to “Forward”. This
sets tape in motion.
7. Red bias indicator will glow when oscillator
is operating properly. This indicates a new recording
is being made and previous recording on the tape will
be erased.
Page4
8. When recording is completed, turn control
knob (30) to “STOP”.
To Rewinda Tape
1. To rewind tape, turn control knob (3) to
“Stop”, then place tape over guide roller (23) from reel
to reel. Turn control knob to “Rewind”. Rewind mech-
anism, driven by shaded-pole motor (102), will com-
pletely rewind 1200 ft. of tape (full ‘7” reel) in approxi-
mately 40 seconds.
2. Control knob (30) may be turned to ‘Stop”
anytime during rewind without danger of tape spilling.
3. To rewind tape without unthreading, tape
should be placed on top of Record-Reproducer head
shield. Be sure tape is returned to its normal position
on the heads before recording or reproducing.
Caution:
When switching from “Rewind” to “Forward”
always pause in “Stop” position long enough for tape
to come to a complete stop. Failure to do so will re-
sult in tape breakage due to tight grip which capstan and
pressure roller exert on tape when control knob (30)
is in “Forward” position.
To Playbacka Tape
1. Make interconnections and correct soeed as
described under “Operating Instructions” on page 3.
2. Set selector switch on amplifier (PT6-6J
amplifier) to “PLAYBACK” position.

Figure 4. TapeTransport with Front Panel Removed.
Pressure Roller
3. Turn speaker volume control clockwise; pull
meter switchout for “Off” if volume level on playback
makes it necessary to prevent meter damage. Pressure Roller (35), actuated by control knob
(30) through switch control shaft (93) and pressure
roller arm assembly (79), with the tension spring keeps
a positive pressure against tape and capstan, main-
taining constant rate of tape travel.
4. Depress safety button (19) and place control
knob (30) in “Forward” position.
Hi-SpeedForward
“Hi-Speed Forward”contro1 is theknob on right
side of front panel. This control will function only
with Main Control Knob in ‘Stop” position. To place
machine in ‘Hi-Speed Forward”, turn control to right
and hold. To stop machine, release control.
If you have rewound tape too far, turn Hi-Speed
Forward knob to reel tape rapidly forward until begin-
ning of recording is reached.
RecordingIndicator
Recording Indicator lamp will glow when plate
supply voltage is supplied to oscillator tube. This
indicates any previous recording on tape is being
erased and a new recording may be made.
MECHANICALOPERATION
Flywheeland Capstan
Balanced flywheel, drive hub and capstan shaft
assembly (83), driven by two rubber-tired wheels (67
and 70), provide constant speed for tape.
Hi-SpeedForward
Hi-Speed Forward is put into operation by rotat-
ing Hi-Speed Forward control knob (1’7A) in a clock-
wise direction. This, in turn, actuates control shaft
and wire (126), pivot arm (53), wire (52), and fast
forward wheel mounting bracket (50), pulling fast for-
ward wheel (56) into contact with drive motor shaft and
take-up hub (39). Simultaneously, pivot arm (53) moves
against fast forward actuating switch, starting main
drive motor (121).
Rewind System
When control knob (30) is placed in “Rewind”,
switch (125) is actuated, starting rewind motor (102).
A DC operated solenoid is also energized during re-
wind, pulling forward idler wheel (61) away from take-
up hub (41), allowing bearing mounted take-up shaft
(36) to turn freely. When rewind operation is com-
pleted, and control knob (30) returns to ‘Stop”position,
solenoid is de-energized. This allows forwsrd idler
wheel (61) to contact take-up hub (41), applying a
braking force sufficient to stop reel.
Page5

17A
P
c
Ls
B
Figure 5A. ExplodedView of Parts AboveFront Panel.
Page6

Figure 5B. ExplodedView of Parts BelowFront Panel.
Page7

Figure 5C. ExplodedView of Parts BelowBackPanel.
ADJUSTMENTS
The “one way” pawl-actuated clutch on rear
shaft extension of rewind motor (102) operates so that,
as tape is unwound from payoff spindle (2), a certain
amount of drag is imparted to motor shaft, which is
then transmitted to tape as tension. When rewinding,
pawlis disengaged from ratchet disc (111) by direction
sensitive rewind paw1 spring (llO), allowing motor
shaft to turn freely. A rapid rewind results.
HeadAlignment
1. The primary purpose in head alignment is to
provide maximum frequency response.
(NOTE: Before attempting to align record-reproduce
head, make certain difficulty is not due to an accumu-
lation of tape coating residue on pole surfaces.)
Drive System
The drive system is driven by main drive motor
(121) throughtwo rubber-tired idler wheels (67and 70),
mounted on sliding suspension arm supports (85 and
87). Idler wheels (67 and 70) are held in contact with
hub of flywheel assembly (83) and drive motor shaft
(121) by springs (71). This, in turn, drives capstan
(33), which is secured to flywheel shaft and, with
pressure roller (35) conveys tape at aconstant speed.
Take-UpSystem
Take-up shaft (36) is driven by forward idler
wheel (61), making contact with drive motor shaft and
take-up hub (41). Take-up hub (41) is concentrically
mounted on take-up shaft (36) and is coupled to the
shaft through a clutch assembly (39 thru 46) similar
to that in the rewind system. With tape properly
threaded on recorder and mechanism in “Forward”,
take.-up shaft (36) slips a certain amount due to pres-
sure applied on tape by slower running capstan and
pressure roller. Consequently, tension imparted to
tape causes tape to move from one reel to the other
without throwing or stalling.
2. The right mounting screw of the record -
reproduce head is drawn up securely. This side of
head holder is provided with a rocker action. Left
adjustment screw (14) is associated with a compres -
sion spring. Rotating this screw changes gap align-
ment with respect to tape. Proper alignment is
achieved when maximum signal, at a given setting of
the gain control, is reproduced from alignment tape,
as alignment screw (14) is turned in or out.
SolenoidAdjustments
The Plunger of Solenoid (72), energized during
rewind, should pull against springs (64) and lift idler
wheel (61) away from drive motor shaft by l/16”, but
maintain contact between idler wheel (61) and the
take-up wheel (41). When mechanism is switched from
“Rewind” to “Stop” the solenoid relaxes, spring (64)
returns idler wheel (61) into contact with drive motor
shaft. This shaft is not turning and in turn, idler wheel
(61) is prevented from turning: This stops free ro-
tafion of Take-up Wheel (41), acting as a brake on the
take-up shaft.
Solenoid (72) should be positioned to accomplish
the above. The solenoid is mounted by two screws in
Page8

Figure 6. TopView of Bias Oscillator Chassis.
BIRS 0%
t
T
t
t
i-
I
TAPETRANSPORTSCHEMATICPT6-6A
Page9

L
Figure 7. BottomView of Bias Oscillator Chassis.
slotted holes in back panel above drive motor (121).
When readjusting solenoid, be careful plunger does not
bind within tube. To check this, place recorder in its
operating position and operate control knob (with power
applied to mechanism) between “Rewind” and ‘Stop”.
Return springs (64) should have enough tension to re-
turn idler wheel (61) to normal position when there
is no binding of solenoid plunger.
Clutch Adjustments
Tape tension is maintained by two friction
clutches. Their correct adjustment causes tape to
move from one reel to the other in either direction
without throwing tape or stalling and applies proper
tape tension for tape contact on heads.
1. Clutches are located on rear ends of supply
reel spindle (2) and take-up reel spindle (36). Supply
reel spindle clutch is located at right side (facing rear
of unit). It consists of a felt washer (112) lubricated
with silicone fluid pressing against a ratchet (ill),
free to rotate in a clockwise direction but prevented
from turning in opposite direction by a spring-loaded
paw1 (105). Pressing against opposite side of felt
washer is a brass washer (113) and a sponge rubber
washer (114). On the other side of the ratchet(ll1) is
a silicone lubricated felt washer (109) which also ex-
hibits a clutch effect. To remove complete friction
assembly, loosen screws (107) and (116) and slide
assembly off shaft. A split knurled adjustment lock-
nut (115) bears against sponge rubber washer (114)
and is loaded in place by a set screw (116). Set screw
must be backed off before adjusting locknut (115) can
be turned. Rotating adjustment locknut clockwise in-
creases clutch friction.
2. The supply reel spindle clutch adjustment
should maintain a drag as supply reel rotates when
recorder is in “Forward” operation. This drag should
be sufficient to stop supply reel without permitting
tape to loop, or to be thrown when control knob switch
is turned from “Forward” to “Stop”. The amount of
friction should be minimum necessary to accomplish
this, (3 to 4 inch ounces).
3. Too much clutch friction will increase tape
drag to a point where tape speed will cause flutter
and wow.
4. Take-up reel (36) friction clutch is located
on left side (facing the rear). This is similar in ap-
pearance to the other clutch but employs no pawl. It
is also necessary to back off set screw (46) before
adjusting this clutch. +.
5. Take-up reel spindle friction clutch couples
spindle to synchronous drive motor, when control knob ,
is set to “Forward”, and acts as a brake on take-up
reel when control knob is set to “Stop”. Clutch ad-
justment shouldprovide sufficient friction for take-up
reel to take up tape at normal speed forward when
take-up reel is almost completely full and supply
Page10

Af AMP
@ 1’2SJ7
81 34”’
AFAMP @ 6Sl7GT PHASEINV OUTPUT
@ 5881
31 400” I
8 EQUALIZERsw,rt~
SHOWNINSLOWPQSlTlQN
I-SLOWBFAST r----------.--‘-----------------
AMPLIFIER SCHEMATICMODELS PT6-J, PT6-6J

Figure 8. TopView of PT6-6JAmplifier Chassis.
reel nearly empty. It should also provide sufficient
braking to maintain tape tension and prohibit tape
throw when control switch is turned to “Stop”, after
take-up reel has been rotating at high speed during
rewind. The split, knurled locknut (45) should be
adjusted to provide minimum clutch friction to ac-
complish this. About 4 to 6 inch oz. for the take-up
clutch is correct friction.
CLEANING
Portions of the erase and the record-reproduce
head which contact the tape must be kept free of dust,
grease and foreign matter, or frequency response
characteristics will suffer. Clean with a soft cloth
\ slightly moistened with carbon tetrachloride or ethyl
’ alcohol after every five hours of operation.
(NOTE: Do not attempt to apply carbon tetrachloride
to any part of recorder when loaded reels are in place.
Tape is soluble in carbon tetrachloride and will be
ruined if it comes in contact with the solution. After
using carbon tetrachloride, make sure heads are com-
pletely dry before threading tape and none of solution
is transferred to the tape from the fingers.)
Oiling the Clutch Felts
Felt washers have been lubricated with silicone
fluid at the factory to provide correct amount of
slippage.
Caution:
Do not oilclutch felts. This may cause oil to be
thrown on nearby idlers, causing slippage in the drive
system.
4
Page12

- Ir ._ - . . _I- _ , __ _ . .
--
Figure 9. BottomView of PT6-6JAmplifier Chassis.
Figure-lo. BottomView of PT6-6JAmplifier Chassis.
Page13

-
Ref.
No. Part
No.
91A5
91A82
61-8SS3
71D772
71D771
61-4PB5
7 63A5
8 63A28
9 91A49
10 63A28
11 63X29
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
76A8
75All
61-2112
‘!
91A17
77A25
8788
62-43H20
75A96
61-4PB5
63A5
63A28
91AlO
63A28
63x29
76A8
75All
91A56
91A57
87A14
75A37
61-4K6
75A16
75A15
34 61-4K5
35 91A14
91A15
36
37
91A51
42
43
46
91A52
75A63
75A62
6389
91A38
63A9
63AlO
63All
75A70
61-8CS8
47 77A35
48 71B41
MECHANICALPARTSLIST
Description
Reel Retainer (2)
Rewind Reel Flange Assembly
3 x 32 x 3/16 Allen Hd. Set Screw
Matte Panel
Front Panel
#&40x 5/16 Phillips B.H.M.S.
3. N.P.
Dural Washer
Fibre Washer
Roller & Bearing kss’y.
Fibre Washer
Felt Spacer .257 1.D.x ‘7/16
D.D. x l/16 Th.
Guide Roller Shaft
Spacer
Screw, Mach. 2-56 x 3/4
Fillister Hd. N.P. (4)
Erase Head Assembly
Head Adjusting Spring (2)
Knob With Set Screws (2)
7/16-20 Hex Nut Steel N.P.
Safety Knob
#4-40 x 5/16 Phillips B.H.M.S.
St. N.P.
Dural Washer
Fibre Washer
Roller & Bearing Assembly
Fibre Washer
Felt Spacer .257 I.D. x 7/16
O.D. x l/16 Th.
Guide Roller Shaft
Spacer
Top Shield & Lining Assembly
Record & Reproduce Head Final
Assembly
Control Knob With Set Screws
Control Sleeve
P-32 x 3/8 Knurled H.M.S. Brass
7 l/2” Capstan 60 Cycle (Not
Shown in Exploded View)
15” Capstan 60 Cycle (Shown In
Exploded View)
4-36 x 5/16 Knurled H.M.S. Brass
7 l/2” Pressure Roller Assembly
30 Cycle (Not Shown in Exploded
View)
15” Pressure Roller Assembly
60 Cycle (Shown in Exploded
View)
Take-up Shaft &Bayonet Spindle
Assembly
Take-up Bearing & HousingAss’y
Take-up Hub Tube
Take-up Hub Flange
Felt Washer
Take-up Wheel & BearingAss’y.
Felt Washer
Brass Washer
Rubber Washer
Locknut
8-32 x 1/2”Lg. Allen Hd. Cap.
Screw
Spring
Right Half Side Panel
Ref. Part
No. No.
49 62-6H4
50 72A42
51 91A217
52 78A13
53 78A91
54 78A12
55 63A98
56 91886
57 63A19
58 67A.l.2
59 67A12
60 63A19
61 91A740
62
63 63A19
64 77A4
-‘.w 65 91A739
66 75A44
67 91826
68 63A19
69 67Al2
70 91A26
71 77A4
72 31A23
73 67X7
74 63A8
75 78A22
76 74A21
77 76A2
78
79 91All
80 91A214
81
82
83 91A765
84 78X28
-’ -85 91A216
86 75A45
--. 87 91A216
88 75A44
89
90
91 74A66
92 61-6SS3
93 76A39
94 67X13
95 91A31
96
97 71B58
98 75A282
99 91A918
100
101 75A283
102 35B16
103 72A134
104 71A319
105 71A87
Description
#6 Hex Nut
Puck Arm Bracket
Lever Mounting Bracket & Stud
Assembly
Wire Link Short
Pivot Arm
Wire Link
Capstan Shaft Spring Washer (2)
Fast Forward Puck 2 l/2!?
Washer
Hairpin Retainer
Hairpin Retainer
Fibre Washer
Take-up Puck Assembly 2”
Felt Washer
Fibre Washer
Puck Springs (2)
PuckArm & Plate Assembly-
Take-up
Take-up Puck Plate Spacer (2)
Drive Puck Assembly 2 1/2l?
Fibre Washer
Hairpin Retainer
Drive Puck Assembly 2 l/2??
Puck Springs (2)
Solenoid .
3-32 x 1/2”Drive Lot. Pin
Felt Washer
Bearing Retainer
Capstan Bearing
Pressure Arm Shaft
Washer
Pressure Arm Assembly
Pressure Arm Plate Assembly
Washer
“C” Washer
Capstan Shaft Assembly
Ball Bearing
Puck Arm & Plate Assembly-
Drive
Puck Plate Spacer-Long
Puck Arm & Plate Assembly-
Drive
Washer
Control Sleeve Washer (Part of
Item 31)
Control Sleeve Nut (Part of Item
31)
Cam
6-32 x 3/16 Allen Set Screw (2)
Switch Shaft
l/4” Tru-Arc Retaining Ring
Safety Shaft & Pin Assembly
Safety Shaft Spring
Left Hand Side Panel
Spacer, Long Rewind Motor (2)
Spacer, Short With Bumper,
Rewind Motor (2)
Rewind Motor Mounting Nut (4)
Motor Spacer (2)
Rewind Motor
Paw1 Mtg. Plate Bracket
Paw1 Mtg. Plate
Paw1
Page14

Ref. Part
No. No.
106 75885
107 61-8SS3
108 ‘75684
109 6369
110 ??A2
111 75A86
112 63A9
113 63AlO
114 63All
1’15 91A70
116 61-8BCS8
I
MECHANICALPARTSLIST (Continued)
Description
Rewind Hub Tube
8-32 x 3/16 Allen Hd. Set Screw
Rewind Hub Flange
Felt Washer
Paw1 Spring
Ratchet
Felt Washer
Brass Washer
Rubber Washer
Locknut Assembly
8-32 x1/2 Lg. Allen Hd. Cap
Screw
Ref.
No.
v1
ClA
ClB
c2
c3
c4
c5
C6
c7
C8
c9
Cl0
Cl1
Cl2
Cl3
Cl4
Ref. Part
No. No.
117 91c2
118 75A30
119 62-25H720
120 61A18
121 35B49
122 77A6
123 91A30
124 72A3
125 43x14
126 91B736
ELECTRICALPARTSLIST - PT6-6A
BIAS OSCILLATOR
Part
No.
97-12AU7
23X10
22X8
21x21
26X8
21X6
21X6
21x1
21X4
21X4
28X1
28X2
28X2
1 28X2
1 28X2
Description
Bias Oscillator
Cap.,Elect., 20 mfd. @ 150V
Cap.,Elect., 20 mfd. 8 150V
Cap., Oil, 6 mfd. @ 220V.
Cap.,Mica, .0068 mfd. @ 300V
Cap.,Bathtub, .5 mfd. @I600V
Cap.,Mica, .002 mfd. @ 500V
Cap.,Mica, .002 mfd. @ 500V
Cap.,Mica, .0025 mfd. @ 500V
Cap.,Mica, 50 mmf. @ 500V
Cap.,Mica, 50 mmf. @ 500V
Cap.,Ceramic Disc, .Ol mfd.
@ 4oov
Cap.,Ceramic Tub., .l mfd.
@ 600V
Cap.,Ceramic Tub., .l mfd.
@ 600V
Cap.,Ceramic Tub., .l mfd.
@I600V
Cap.,Ceramic Tub., .l mfd.
@ 600V
Ref.
No.
5-F
Cl6
RlA
RlB
R2
R3
R4
R5
R6
R7
Ll
Ml
M2
M3
M4
M5
Description
Back Panel Assembly
Thrust Housing
l/4-20 Hex Nut x 7/16 St. N.P.
l/4-20 x l/2 Set Screw-Thrust
Drive Motor, Hysteresis
Synchronous, a-Speed 900-1800
RPM
Pressure Arm Spring
Switch Arm & Pin Assembly
Switch Mounting Bracket
Switch D.P.S.T. (2)
Control Linkage Assembly
Part
No. Description
22X15
22X15
14X32
11x10
11x14
11x2
11x10
11x129
11x21
31A6
42A5
41x11
54X2
56X1
55x4
Cap.,Ceramic Tub., .l mfd.
$24oov
Cap., Ceramic Tub., .l mfd.
@4oov
Bias Osc. Control,lOK, l/ZWatl
Bias Osc. Control,lOK,1/2 Watt
Resistor, 22K, l/2 Watt
.Resistor, 1009, l/2 Watt
Resistor, lOK, l/2 Watt
Resistor, 22K, l/2 Watt
Resistor, 22051, l/2 Watt
Resistor, 470, 1 Watt
Bias Oscillator Coil
Selenium Rectifier, 150 MA
@ 150v
Neon Bulb, Recording Indicator
Lamp, #NE- 51
Cannon Receptacle - Female
Barrier Terminal Strip
Jones Plug, 10 prong, Male
ELECTRICALPARTSLIST - PT6-Jor PT6-6J
,
AMPLIFIER
Ref.
No.
VI
v2
v3
v4
v5
V6
ClA
ClB
ClC
ClD
C2A
CZB
c2c
C2D
Part
No. I Description
97- 5879 Recorder-Mic. Preamp
97-12SJ7 AF Amplifier
97-6SL7GT AF Amplifier-Phase Inverter
97-5881 Audio Output
97-5881 Audio Output
97-5Y3GT Rectifier
23X23 Cap.Elect., 20 mfd. @ 450V
Cap.,Elect., 20 mfd. @ 450V
Cap.,Elect., 20 mfd. @ 450V
Cap.,Elect., 20 mfd. @450V
23x9 Cap.,Elect.,40 mfd. @ 450V
Cap.,Elect.,JO mfd. @ 450V
Cap.,Elect., 10 mfd. @ 450V
Cap.,Elect.,20 mfd. @ 25V
Ref.
No.
c3
c4
c5
C6
c7
C8
c9
Cl0
Cl1
Cl2
Part
No.
23X12
23X12
23X12
23X12
23X12
22X15
21X6
21X26
22X3
Description
Cap.,Elect.,lOOO mfd. @I+%‘-Zic/
Cap.,Elect.,25 mfd. @ 25V
Cap.,Elect.,‘25 mfd. @ 25V
Cap.,Elect., 25 mfd. @ 25V
Cap.,Elect., 25 mfd. @ 25V
Cap.,Elect., 25 mfd. @ 25V
Cap.,Ceramic Tub., .l mfd. @
400V,(Some versions use .05
mfd. @ 400V.)
Cap.,Mica, .002 mfd. @ 500V
(Some versions use ..0025 mfd.)
Cap.,Mica, 75 mmf. @ 1500V
(Some versions use 50 mmf.)
Cap.,Paper Tub., .05 mfd. @400V
Page15

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.
ELECTRICALPARTSLIST - PT6-J or PT6-6J AMPLIFIER (Continued)
Ref. Part
No. No. Description
Cl3 22X3 Cap.,Paper Tub., .05 mfd. @4OOV
Cl4 21X5 Cap.,Mica, .0004 mfd. @ 500V
Cl5 22X3 Cap.,Paper Tub., .05 mfd. @!4OOV
Cl6 22X3 Cap.,Paper Tub., .05 mfd. @4OOV
Cl? 21X6 Cap.,Mica, .002 mfd. @500V
Cl8 22X78 Cap.,Molded Tub., .0047 mfd.
@400V (Not used in Some
Versions)
Rl 14X21 Control,Gain, lOOK, l/2 Watt
R2 14X6 Control, Speaker Volume, 3OS& 7Z
4 Watt Wirewound I,
R3 13x7 Resistor, 4’7K, 5% l/2 Watt
R4 11x34 Resistor, 15K, 1Watt (Some
Versions use 47K)
R5 11X67 Resistor, lOOK, 1 Watt
R6 11X6 Resistor, 270K, l/2 Watt
R7 11X28 Resistor, 150052, 1 Watt
R8 11X67 Resistor, lOOK, 1 Watt
R9 13x7 Resistor, 47K, l/2 Watt
RlO llx15 Resistor, 8200, l/2 Watt
Rll 11x4 Resistor, 470K, l/2 Watt
R12 11x9 Resistor, lOOK, l/2 Watt
R13 11X8 Resistor, 390052, l/2 Watt
R14 11x14 Resistor, 1000, l/2 Watt (Some
Versions use 2200)
R15 13x3 Resistor, 6200, 5% l/2 Watt
R16 11x4 Resistor, 470K, l/2 Watt
R17 11X138 Resistor, 56K, 1 Watt
R18 11x2 Resistor, lOK, l/2 Watt
R19 11X8 Resistor, 39OOQ l/2 Watt
R20 11X138 Resistor, 56K, 1 Watt
R21 11x6 Resistor, 2’70K, l/2 Watt
R22 12X4 Resistor, 200052, 10 Watt
Wirewound
R23 11x112 Resistor, lOOK, 2 Watt
R24 17057 Resistor, 2700, 2 Watt (Some
Versions Use 250W 5 Watt)
R25 11x6 Resistor, 270K, l/2 Watt
R26 11X28 Resistor, 15OOQ 1 Watt
R27 . 13x7 Resistor, 47K, 5% l/2 Watt
R28 11X8 Resistor, 39OOQ, l/2 Watt
Ref.
Part
No. No.
R29 11X28
R30 11x11
R31 11x11
R32 12X4
R33
R34
R35
11x2
13x15
12x20
R3k
Ll
Tl
f~Wil.u ,070
31x5
32B29
T2
T3 32X1
32B30
SPl
Ml
M2
M2
M3
M4
M5
33X6
42X6
53x10
53x5
43x74
M6 43A122
M7
M8 43X20
43X16
M9
Ml0
Ml1
Ml2
Ml3
Ml4
Ml5
Ml6
46B9
91B87
54X2
55x10
57x4
57x4
56X3
54x1
87B17
Description
Resistor, 15OOQ l/2 Watt
Resistor, 33OS2,l/2 Watt
Resistor, 33052, l/2 Watt
Resistor, 200051, 10 Watt
Wirewound
Resistor, lOK, l/2 Watt
Resistor, 4352, 5% 1 Watt
Resistor, 25 Q, 10 Watt Wire-
wound Adjustable. (Tap is ad-
justed to 12.6V on heater line.)
Coil, Adjustable
Power Transformer, 7OOVCT @
100 MA, 5V @ 2A, 6.3V @ 2.4A,
17V @ 300 MA
Input Transformer
Output Transformer, Pri.Imp.
55OOn CT,Sec.. Imp., Sec. 1
-6OOS2,Sec. 2 -1652 tapped at 40
Speaker, 5” PM, 3-4W VC
. .
Se1m cm&k w ;
Fuse, 3A. Slo-Blo, type 3AG
Fuse Holder
Pilot Lamp -VU Meter
Pilot Lamp - VU Meter
Equalization Switch, Rotary Wafer
Type
Function Switch, Rotary Wafer
Ganged Type
Meter Switch, Leaf Type
Power Switch, SPST Bat Handle
Toggle
VU Meter, Includes M3 and M4
Equalizing Network, Plug-in
Cannon Receptacle, Female
Cannon Receptable, Male
Phone Jack
Phone Jack
Terminal Strip, 5 Contact
Jones Socket, 6 Contact Female
Control Knobs, 4 Used
458HWS2.5 Printed in U.S.A.