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GENERAL I NFORMAT ION

Silvertone Models 80?0 and 80?2 are electrically alike. The major difference between

the two models is mechanicai. Model 80?0 is a single speed and Model 80?2 is two speed.

Models 8070 and 80?2 are designed to record and play two tracks of material on standard

width recording tape. This doubles the recording and playing time without loss of quality or

frequency response. Recordings can be'made from a phonograph, radio or televisionreceiver,

in addition to those made directly from the microphone.

Model 80?0 has one speedr T V 2"per second, while Model 80?2 has two speeds, 3 3/4"

and ? Lf 2" per second. Using both tracks, the recording times are as follows:

Reel Size

5" (600 ft. )

7" (1200 ft. )

3 3/ 4" Speed

t hour

2 hours

7 I/ 2,' Speed

1rl 2 hour

I hour

Models 8070 and 80?2 are designed to operate on 60 cycle, tl0-120 volts, AC supply

only. Before connecting to a supply line, be absolutely certain that it agrees with the above

specifications.

SUPPLIED by:

SEARS, ROEBUCK & CO.

925 S. HOMAN STREET

CHICAGO 7, ILLINOIS

fhis moterial compiled ond published by

& co., lNc., lNDlANAPOlls,

Copydghr 1957 . ,tll Righb Rcrcwed

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SPECIFICATIONS Externar 3.2 ohm speaker

External-lolv impedance across 3. 2 ohm voice

Fast Forward And Fast Rewind Speed: coil for external speaker.

External high impedance for external ampiifier

5" Reel, (600 ft. ) 55 Seconds (Approx. ) or monitor in record or playback position.

7" Reel, (1200 ft. ) 105 Seconds (Approx. )Maximum Reel Size:

Frequency Response:

3 3/ 4" speed - 65 to 6000 cycles per second

7 I/ 2" speed - 65 to 8b00 cycles per second

Bias And Erase Frequency;

52.5KC

Bias Voltage:

Shure Head, 10 volts bias

Michigan Mag. Head, 20 volts bias

Power Output:

2 Watts undistorted

3 Watts maximum

Inputs:

Microphone, I Meg. impedance

Radio-Phone, .5 Meg. impedance

Outputs:

Two internal 5" speakers

PAGE 2

7" (1200 ft. )

OPERATING I NSTRUCTIONS

Speed Control-

The operating speed setting is accomplished by

placing the speed control button (1) in either the ,,Upil

or "Down" positiono "IJp" for 3 B/ 4r, per second and

"Down" for ? L/ 2" per second. (Model 80?2 only).

CAUTION: NEVER operate this control unless the

ON-OFF switch (12) is in the ON position.

Threading Tape-

1. Place a reel of tape on the right reel plate

(9), and an empty reel on the left reel plate (g) mak-

ing certain the reel slots engage the pins on the reel

plates.

2. Turn the Play-Record control knob (b) in the

center of the machine to the fully counterclock-wise

position.

3. Unwind about I0" of tape from the reel. Hold

a section of the tape straight with both hands and insert

the tape in the tape slot making certain that the dull

coated side faces the rear of the recorder.

4. lnsertthe end of the tape into oneof the three

radial slots in hub of the take*up reel. Turn the reel

several turns, clockwise, until the tape is secured to

the reel and all slack is taken up between the reels.

To Record From Microphone-

1. Turn the recorder on by rotating the "ON"-

OFF" controi to the right. Allowabout 30 seconds for

the tubes to warm up.

2. Insert the microphone plug into the rrMikerr

jack.

3. Adjust the speed control knob (1) for the de-

sired speed - 3 3/ 4,' or 1 l/ 2,, per second.

4. Push down on the Play-Record control knob

(5) as far as it will go. Hold down and turn clockwise

until it locks.

5. Ilold the microphone away from your mouth

about 6 to 12 inches and speak in a normal voice. DO

NOT SHOUT. Adjust the volume eontrol until the re-

cord level indicator fl.ashes on the loudest sound.

NOTE: Correet volume level on recording is very

important. Too \treak a signal, which does

not cause flashing on the recording level in-

dicator, will result in weak playback and

high background noise. Too strong a signal,

which causes continuous flashing of the level

indicator, will result in distortion during

playback.

To Record From Radio-

Recordings from a radio may be made by one

of these methods.

l. Through the microphone by pickup from the

radio speaker:

Place the microphone about 6" to 12" in front of

the radio speaker. Turn the radio volume control to

a normal level. Setting it too high will cause distor-

tion. Turn the radio tone control to treble or high.

Set the recording level and record as under ilTo

Record From Microphone. "

2. Through a direct connection to the Radio

speaker:

Make up a shielded cable with a two conductor

phone plug on one end and two alligator clips on the

other end. Connect the alligator clips across the

voice coil terminals of the tadio speaker and insert

the plug into the "Radio-Phono!' jack. Set the radio

volume and tone controls as described above. Set the

recording level and proceed as described under 'rTo

Record From Microphone".

3. Through a direct connection to the volume

control of the radio:

Make up a shielded cable with a two conductor

plug on one end. Connect the other end across the

radio volume control. Insert the phone plug in the

"Radio-Phono" jack. Set the recording level and pro-

ceed as described under "To Record from Microphonetr.

The radio volume and tone controls do not affect this

set up, consequently they may be set any place.

To Record From Record Player-

1. If the Record Player being used has a phone

type plug on the pick-up leads, insert it into the

"Radio-Phono" Jack. Set the recording level and

proceed as Listed under "To Record From Microphone rt.

2. If the Record Player has a standard pin type

plug, which is more common, an adapter is needed"

Insertthe pin plug intothe adapterand plugthe adapter

into the "Radio-Phono" jack.

To Record From Television Receiver-

Use one of the three methods described under

"To Record From Radio".

Dual Track Recording-

These recorders are designed to record and

playon one-half the width of the tape at a time; there-

by resulting in two track recording. To record on the

other half of the tape remove the full reel from the

takeup (teft) side, turn reel over and place it on the

feed (right) side. In playing or recording you may

stop any place and reverse the reels to use the other

track,

Fast Forward And Fast Rewind-

High speed forward or tewind operation may be

obtained by pressing the desired knob (13) toward the

head cover. This will wind the tape on the desired

reel at a high speed as long as the knob is held in this

position.

NOTE: Do not attempt fast forward or rewind with

the Play-Recordcontrol on any setting except

neutral position, as damage to the unit or

tearing of the tape will result.

Braking-

This recorder contains an automatic brake

mechanism giving more accurate tape control. To

stop the tape at any time, when operating on fast for-

ward or fast rewind, simply release the forward or

rewind control. The tape will automatically come to

a stop.

To Play A Recording-

l. Thread the tape as describedunder "Thread-

ing Tape".

2. Turn play-record control (5) clockwise with-

out depressing until it locks.

3. Adjust the "Volume" and "Tone', controls

(12) to desired listening level.

To Use An External Speaker-

Plugexternal speaker through a three conductor

plug into the "Output Jack". Connect the three con-

ductor plug as shown in sketch.

CAUTION: Do not insert plug into recorder without

external speaker attached.

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Connect one learl iD rinq To 3.2 chm voice coil

Iip - No Connection Conn.

To Use An External Amplifier-

Plug the external amplifier into the ilOutput

Jack" through a two conductor plug connected as shown

in sketch.

To Edit And Splice Tape-

NOTEI Since it is impossible to edit and splice one

track without affecting the othgr, recordings

to be edited should be limited to one track

onlY.

1. Tape may be edited by cutting out unwanted

portions, or by joining selections into another se-

quence. Announcements can be inserted between

selections, etc. Unused tape can be spliced for re-

use.

2. Forbest results cut tape at a slightdiagonal,

joining ends together with a butt joint and fastening on

the glossy side with splicing tape. Trim off any ex-

cessive width.

To Erase A Recording-

In the record position any recording on the tape

is automatically erased before the new recording is

put on the tape" Should .it be desired to erase a

recording without recording new material, follow the

normal recording procedure, except set the volume

control to the full counter-clockwise position.

ADJUSTMENTS

Spindle (19 And 48) End Play Adjustment-

The splndles should have from l/ 321, to /16'r of

up and down movement. To adjust loosen set screw

(65) on spindle to be adjusted and move the pulley (5b)

up or down as required until the correct end play is

obtained.

Take-Up Lever Adjustment-

Spring (83) on the take-up lever (90) controls

the timing of the left take-up reel holder (9). With

the control knob (5) in the play back position, the

take-up reel should start revolving at the same time

or a little after the Pressure Roller (43) starts pull-

ing the tape past the head (39).

Check adjustment by placing a fully loaded ?"

reel on the take-up spindle. Rewind for about l0

seconds. Move the control knob (5) to the playback

position and observe the action described above.

If adjustment is required, bend ear on take-up

arm (85) in the position and direction indicated in

PAGE 4

sketch on exploded view. Care must be exercised

when making this adjustment and repeated trials be-

tween bends should be made.

Take-Up And Feed Reel Drag-

When the control knob (5) is placed in the

't{eutral" position the reels should stop promptlywith

a minimum of overrun. There should be no looping

of the tape. With control knob (5) in the neutral po-

sition and without reels on the holders, they may re-

volve slightly, but once the reels are put in place they

should not revolve.

Stops, labeled rrCtt and "D" on Figure 3E!, lo*

cated on baseplate (22) controls the above actlon.

They regulate the amount of return that take-up arm

(85) or rewind arm (52) makes aJter controls have

been released; not suJflcient return would cause con-

tinued Fast Rervind or Fast Forward operation, while

too much return would not allow drive belts (88) or

(59) to put a drag on the respective pulleys. Bend

these stops carefully so as to obtain operation de*

scribed above. Stop "C" controls the take-up side

while stop "D" controls the rewind side.

Head Alignment Adjustment-

It is extremely important that the llead (39) be

lined up perfectly with the tape. If not, the result

will probably be low output, track overlap, or loss of

high frequencies.

l. Chassis 567.58030, 528.58030 and 528.58010

(SHURE Head).

If the SIIURE Head requires replacement, the

complete assembly composed of the head and head

holder should be replaced. The head holder is ad-

justed individually to the head and sealed at the factory.

When installing head (39A) observe the following

precautions:

. HEAD HEIGHT: Place a " l?9t' galrge (between

ll/64" and 31116') near the mounting bracket and

between base plate (22) and bottom of head holder.

Push down on head (39A) and tighten set screw (23).

Remove gauge"

An alternate method of adjusting the head height

when a gauge is not available is as follows:

(a) Remove the pressure shoe assembly (36)

from the pressure bracket so the head can be ob-

served through the opening in the pressure bracket"

(b) Align head (39A) so the bottom of the

head opening is at the same level (or slightly higher)

as the corresponding bottom of the opening of the

pressure bracket.

approach the tahe-up reel nearlycentered between the

flanges of the reel. If the tape runsagainst the bottom

flange, it is an indication that the head is too low.

(d) Make "Output Responserr adjustment as

described in Section 3 below.

2. Chassis 567.58031, 528.5803f and 528.58011

(Michigan Magnetic llead)

On units using the Michigan Magnetic Head, a

Connect to shield

To external amplifier

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simple alignment procedure is as follows:

(a) Place a full reel of tape on the right hand

spindle (i9) and thread tape. See "Threading Tape".

(b) Pulltape tight againstHeads (26) and (28)

by rotating one reel while holding the other reel.

the top edge of the tape is exactly even with the bottom

edge of the ground down 'Tlat" section on the face of

the heads"

(d) When in this position, both heads should

also be perpendicular to the bracket vertically and

horizontally.

(e) The faces of the heads should be in line

with each other so as to present a flat surface to the

tape, i. e. one head should not protrude further for-

ward than the other.

3. Output Response

To make this adjustment, a tape onwhich a 3000

cycle note has been recorded by a unit known to be in

good operating condition will be required.

Connect an output meter, or AC voltmeter,

across the speaker voice coil of the unit to be adjusted.

Whileplaying back the 3000cycle note tape, pivot head

(39) back andforth on mounting screw (23) until maxi-

mum amplitude on output meter is achieved. Make

certain that head height has not been changed.

If a 3000 cicle tape cannot be made, use a re-

cording with high note content to mal<e the adjustment

described above"

4. Track Overlap

This should be checked by first making a re-

cording on a blank tape with the unit being checked.

Do not rewind the tape, merely reverse the

reels and play back the other track.

There should be no sound but, if what is heard

is backwards, there is track overlap. To correct

this, it will be necessary to adjust the tape guide on

the side of the head holder by bending it upwards.

This should move the tracks further apart.

Switch Cam Adiustqglt-

The Play-Record Switch in the amplifier

chassis is normally held in the play position by a

spring located on the switch arm. When cam on the

end of the control shaft (?0) actuates switch, it should

move the switch far enough to allow all circuits to be

switched from Playback to Record. If adjustment is

required proceed as follows:

1. Loosen set screw (33).

2. Carefully detach one end of switch spring.

3. Push down on control knob (5) and turn it

clockwise to the Record Position.

4. Manually move switch cam (?0) until first

PAGE 5

F IGU RE 3A. EXPLODED V IEW OF PARTS ABOVE BASEPLATE.

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PAGE 7

slide contact touches onlythe first two wiper contacts.

At all times during this step, switch cam (?0) must

touch switch cam at end at switch slide.

5. Move pusher stud (34) to the rRecordt'po-

sition and tighten set screw (33).

6. Reconnect switch spring"

Oscillator Coil Adjustment-

If theoscillator coil (Ll) is replaced, the setting

of the adjustable slug should be checked as follows:

1" Connect a frequencymeter between point 2 of

the erase head and ground.

2" Turn volume and tone controls on.

3. Set the Play-Record knob (5) to the "Recordrt

position.

4. Adjust the oscillator slug for a 52.5 KC

reading on the meter (A non-metallic screwdriver

should be used for this adjustment.)

Hum B4le4qq-

When either the 12AX? tube or the Head (39) has

been changed, the settinq of the hum balancing con-

trol should be checked. This can be done as follows:

l. Connect an A.C. V.T.V.M. across the

speaker coil. The meter's lowest scale should have

a . I volt reading at full scale deflection, or at least

1,/ 3 of full scale.

2. Turn volume control and tone control fully

clockwise.

3. Set control knob (5) to the playback position.

4" Adjustthe hum balance controlfor aminimum

reading. This reading should not exceed .1 volt.

LUBRICATION

The lubrication applied at the time of manu-

facture should be sufficient for a long period of time.

In cases of unusual use, high operating temperatures,

or the replacement of a part, lubrication may be

required.

TROUBLES

Improper Tape Take-Up-

l. Spindle (48) binding.

(a) Lubricate and check end play. See ad-

justment section "Spindle End Playr'.

2. Improper Take-up spring (83) action.

(a) See "Take-up Lever Adjustment".

3. Drive belt slipping.

(a) Clean pulleys.

4. Broken drive belt.

PAGE 8

Fails To Fast Forward Properly-

l. See above except for step 2.

(a) See corresponding remedies above.

Fails To Fast Rewind Properly-

1. See above except for step 2.

(a) See corresponding remedies above.

CAUTION: When replacing belt (59) be sure to give

it a half-twist.

Stalling Or Binding-

l. Speed control (11 settingchanged while unit is

not turned on. This should be done only while motor

(62) is rotating.

(a) With motor (62) turned on, try moving

Speed Control (1) up and down several time6.

(b) Should the above fail, try holding Fast

Forward Control to the left as far as it will go, and

with the other hand manually rotate Take-up Reel

Spindle (48).

to remove unit from cabinet and free any binding

action.

Speed Does Not Agree With Speed Setting-

l. Bend Speed Control Bracket (?4).

(a) Straighten bracket (?4) so that upper and

lower fingers are equal distant from drive belt when

belt is in normal operating position.

2. Broken "ears" on Drive Pulley (61).

(a) Replace entire motor (62).

Tape Creeps Out Of Tape Slot-

l. Head (93) improperly adjusted.

(a) See "Head Alignment AdJustment".

Plays Back But Does Not Record-

1. Bad component.

(a) Cheek voltage and resistance readings.

2. Switch slide not contacting proper terminal.

(a) See "Switch Cam Adjustment".

Does Not Completely Erase Previous Recording-

1. Bad 6VBGT tube.

(a) Replace tube. This tube may function

properly as a power amplifler but not as an oscillator

which is needed for erasing.

2. Bad Head.

(a) Replace head following "Head Alignment

Adjustment".

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PAGE TI

MECHANICAL PARTS LIST

Ref .

No. Part

No. Description ttel.

No. No.

art

PDescription

84-3405

?0-259-0

86-2?0

70-256 -0

52-846-0

52-??9-0

84-3?81

2r-33?-0

2l-141-0

2l-338-0

22-4L-l

22 -ll0-0

83 -112?

84-338r

s?-569

84-3?80

84-3296

52-845-0

52-?81-0

52-844-0

52-782-0

56-230

48-138-2

48-139-2

86-265

22-r20-O

86-2?3

84-3404

86 -280

84-3800

84-3421

9?-5?5

86 -294

n-1048

33-2?1-0

56-234

33-2?0-0

9?-5?3

72-135

84-3408

84-3458

91-511

84-3409

84-3399

?0-253 -0

84-3401

?0-249-0

28-112-1

84-3403

84-3418

* Plunger Knob & Shaft Ass'y.

* Compression Spring

* Flatwasher, Rubber 5/16" I.D,

x 9/16" O.D.

* Spring, Plunger Detent

t Knob, Play-Record (U

* Knob, Play-Record

f Head Cover

r Head Cover

f Cover, Pressure Roller

* Cover, Pressure Roller

t Retainer Spring (2)

* Retainer Spring (2)

f Reel Plate (2)

* Reel Plate

Screw, #6-32 x l/4" Phil. Pan

Hd. (2)

f Top Plate Ass'y.

* Top Plate Ass'y.

f Knob, Volume & Off/ On-Tone

* Knob, Volume & Off/On-Tone

f Knob, Fast Forward & Fast

Rewind (2)

* Knob, Fast Forward & Fast

Rewind (2)

IIex Nut, #3/ 8-32 (2)

Jewel, Neon Lamp

Jewel, Neon Lamp (Alternate

Part)

* Flatwasher, Fiber (1)

Retainer Spring

* Flatwasher, .1?6" I.D. x 5,/ 8"

o. D. (2)

Spindle Ass'y.

Roll Pin (2)

Flatwasher, . 315" I. D. x L/ 2"

o.D. (4)

f Base Plate, Includes Staled &

Riveted Parts

+ Base Plate, Includes Staked &

Riveted Parts

Head Retaining Screw

Washer, Flat

Bracket, Head Mounting

Record llead (MM #3M-20) (Used

In Chassis 528. 58031-528. 58011

- 56?.58031)

Ilex Nut (4)

Erase Head (MM #?EM-12) (Used

In Chassis 528. 58031-528. 58011

- 56?.58031)

Screw, #6-32 x ly'4rr Phil. Flat

Hd. (4)

Washer, Slide Button (4)

Pressure Roller Arm

Pressure Plate & Spring Ass'y.

Set Screw, #6-32 x 3/8tt 'rslab

Hd. "

t Lifter Arm & Set Screw Ass'y"

* Lifter Arm & Set Screw Ass'y.

Spring, Pressure Shoe

Pressure Shoe Ass'y.

* Spring, Brake Lever

* Brake Plate

Head Ass'y. (Used In Chassis

528.58030 - 528. 58010 -

56?. 58030)

Head Ass'v. (Uged In Chassis

4'.1

86-295

22-4Q-L

86 -282

39-l-5

?0-258-0

?0-251-0

22-31-r

86-280

84-3404

22-r5-4

9?-569

?0-252-0

84-3419

86 -289

86-290

22-42-r

84-3413

84-340?

86 -294

9?-b6?

62-?8-0

65-123

84-3456

9?-6r9

84-4240

91 -511

86-288

22-38-r

?0-260-0

11-1046

84-3410

84-3466

62-?9-0

?0-259-0

22-r4-4

86-284

86 -45

9?-569

97 -574

86-293

62-74-0

1Q-244-0

39-1-0

?0-250-0

22-46-r

84-3420

?0-25?-0

39-5-3

62-78-0

?2-135

22-13-4

9?-5?3

528.58031 - 528.58011 -

56?. 5803r

Flatwasher, . 092" I" D. x'l / 32"

O.D. (Part of 84-3403 Head

Ass'y. )

Retainer Sprlng

Washer, Cloth (2)

Pressure Roller

Spring, Pressure Roller

Spring, Slide Return

Split Ring Retainer

Flatwasher, Capstan & Flywheel

Spindle Ass'y.

+ Lever, Foot Switch

Screw, #6-32 x V4" Phi1.

Bd. IId.

Brake Spring (Right)

Feed Reel Arm Assembly

Flatvasher, . 440" I. D. x 11/ 16r'

o.D.

Flatwasher, .440" I. D. x 1/ 16"

o.D"

Hairpin Retainer (Large)

Spindle Pulley & Set Screw

Ass'y. (2)

Bracket, Motor & Lug Ass'y.

Flatwasher, .188 "I. D. x 7/ L6"

o.D. (4)

Screw, #8-32 x 3/16" Hex. Hd.

Drive Belt

Eyetet (3)

Drive Pulley (Part of Motor)

Motor, Plug & Pulley Ass'y.

Set Screw, #8 x 3/16" ttAllen

Hd. " Cup. Pt.

Fan, Hub & Set Screw Ass'y.

Set Screw, #6-32 x 3/ 8t' "slab

Hd. " Cone Pt.

Washer, Rubber

"E" Washer, Retainer

Record Release Spring

Control Shaft Bracket

Control Shaft 6r Lever Ass'y.

Capstan Shaft & Flywheel Ass'y"

Flywheel Belt

* Spring, Two Speed Control

(Lower)

* Speed Control Bracket

* Washer, Flat

* Lockwasher

Screw, #6-32 z V 4,, Phil.

Pan Hd.

Screw, #8-32 x 5,/ 8" Hex.

Hd. Motor Mounting (3)

Washer, Motor Mounting (3)

Rubber Bushing, Motor

Mounting (3)

* Return Spring, Foot Switch

* Cam, Foot Switch Adjustment

Take-up Spring

* Retainer, Foot Switch Adjust.

Cam

Reel Arm Take Up Ass'y.

Brake Spring (Left)

Foot Switch Linkage Rod

Drive Belt, Take-Up

Washer, Slide Button Spacer

Take Up Lever

Screw

t Parts Marked With Dasger Used In Model 80?0. * Parts Matked With Asterisk Ugedln !4Sq9L89!2-_

PAGE 12

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