Viking Ff75 series User manual

PnoToFACT* FolJ"* VIKING

MODEL FF75 Series

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GENERAL I NFORMAT ION

The Viking FF75 Series tape transport mechanism consist of the foiiowing types: FF?5

covers basic mechanism, I'F?5R indicates erase-record heads supplied, FF?5RM indicates

erase and record-monitor operation (3 heads), FF?5S indicates stacked stereophonic heads,

FF?5SU indicates stacked and staggered stereophonic heads, FF?5SR indicates stereophonic

head plus monaural erase-record heads, L suffix indicates tapelifter accessory and LP suffix

indicates tapelifter and pressure pad accessory.

The Viking FF?5 Series can be used with the Viking RPOI Record-Playback amplifier for

professional quality playback, recording and duplicating, or used with the PB60 Preamplifier,

for playback of recorded tape. These amplifiers are covered in this manual"

These recorders have two tape speeds, 7 L/2" andS 3/ 4" persecond" Usingboth tracks

of the tape, the recording time is as follows:

3 3/ 4" Speed 7 L/ 2" Speed

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Reel Size

5" (600 ft. )

?" (1200 ft" )I hour

2 hours 1/ 2 hour

I hour

FF?5 Series is designed to operate on 60 cycle, 105-125 volts, AC supply only"

Manufactured by:

Viking of Minneapolis

3520 East 43rd Street

Minneapolis 6, Minnesota

fhis moteriol compiled ond published by

HOWAnD W. SAmS & CO., lNC., tNDtANApOItS, tNDIANA

Copytight 1957 . All Righh Rcscrved

lllTt I - 57 stt 344 totDER l5

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FIGURE I

SPECIFICATIONS

Power Requirement: 110-volts, AC, 60 watts.

Tape Speed: 7-L/ 2 ips. (3 3/ 4" ipsspeed is available

by changing belt to smaller groove on motor pulley.

Not recommended for reproduction of frequencies

higher than 7500 cps.)

_Frequency Response: 50 to 15,000 cps plus al7-I/ 2

Ips Tape speed.

Signal-To-Noise Ratio: 45 db or better. (This char-

acteristic can be adversely affected by location of

transformer or other sources of strong magnetic fields

within 12 inches of the playback head or heads. )

Flutter: 0.3 per cent or less.

OPERATI NG I NSTRUCTI ON5

1. Plug in the AC cord at a 110 volt, 60 cycle

receptacle.

2. PlacetheTape Motion Control in the I'Sil stop

position.

3. Turn the AC switch on.

Threading The Tape-

1. Place a reel of tape on the left reel piate (27)

and an empty reel on the right reel plate (15) making

sure the reel slots engage the pins on the reel plates.

2. Unwind about 10" of tape frorn the reel. Hold

asectionof thetape straight with both hands and insert

the tape in the tape slot making sure the dull coated

side face in toward the head.

NOTE: This recorder uses Type I'Atr wound tape,

i. e. the dul1 magnetic coated side faces in-

ward on the reel. If the tape used is Type

"8" (coated side facingoutward) the recording

will be made at a very low sound level and

the playback will be almost inaudible.

3. Insert the free end of the tape into one of the

three radial sl.ots in the hub of the empty reel. Turn

the reel several turns, counterclockwise, until the

tape is secured to the reel and all slack is taken up

between reels.

To Record From Microphone-

l. Turn the On-Off control clockwise on the

Weight: 11 pounds.

Record Head Characteristics :

Track width

Gap width

D-C resistance

Inductance

Erase Head (if used):

Track width

Gap width

DC resistance

Inductance

Impedance

0.009 in.

0.0015 in.

300 ohms

290 mh at I kc

0. 125

0. 008

125 ohms

30 mh

10K at 30kc

39K at 100kc

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FI GU RE

amplifier used, and allow about thirty seconds for the

tubes to warm up.

2. Insert the rnicrophone piug into the I'Miket'

jack.

3. Place the Play-Record switch in the record

position.

4. Move the Tape Motion Control to the rtFt'

(forward) position.

5. Hold the microphone about six inches from

your mouth and speak in a normal voice. Adjusting

the "Volume" control causes the electronic eye i.ndi-

cator to respond. Check to be sure that the maximum

peaks do not cause the eye to close entirely. This

will. avoid saturation or overloading of the tape with

consequent distortion. Good recording is obtained

when the electronic eye indicator closes less than half

way on recording peaks.

To Record From Radio-

Recordings from a radio may be made by one

of three ways:

1. Place the microphone about 6rr to l2!t in front

of the radio speaker. Turn the radio volume control

to a normal level. Setting it to high will cause dis-

tortion. Turn the radio tone control to maxirnum

treble. Set the recording level and proceed with re-

cording as described under 'tTo Record From Micro-

phone". Thistype of recordingmaynot be .satisfactory

as other sounds may be picked up by the microphone

which as a result will be recorded on the tape.

2. Have a shielded cable made up 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 on the radio speaker and

insert the cord plug into the ilinput jackil. Set the

radio and Volume and Tone controls as described

above. Set the recording level and proceed as des-

cribed under "To Record From Microphone.'r

3. Have a shielded cable with a two conductor

phone plug on one end and the other end connected

across the radio volume control. Insert the phone

plug into the "input jack". Set the recording leveL and

proceed with the recording as described under "To

Record From Microphone". The position of the radio

volume and tone controls has no effect on this set up

and may be set anywhere.

To Record Frory_.Phonograph-

1. If the phonograph being used has a standard

pin type plug on the pickup leads, insert it into the

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

ceedwiththe recordingas described under "To Record

From Microphone".

To Record From Television-

1. Use one of the three methods described under

"To Record From Radio" andproceedwithtHe record-

ingas described under ilTo Reoord From Microphoneil.

Fast Forward And Rewind-

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High-speed forward or

by moving the control knob reverse can be obtained

(6) toward the head for

Page 3

rewindand all the way from the head for fast forward.

Movement of this control will wind the tape on the de-

sired reel at a high speed as long as the control is in

this position, This control is primarily used in 1o-

catingadesiredportionof arecordingin a few seconds.

To Play A Recory!!4g-

l. Thread tape as described under rtThreading

the Tape".

2. Turn control knob (6) to I'Forward'! and ampli-

fier to playback.

3, Adjust tlte t'Volumet'and t'Tonetr controls for

desired listening level.

To Edi.t And Splice Tape-

NOTE: Since it is impossible to edit and splice one

track without affecting the other, recordings

which are to be edited should be limited to

one trdck only.

l. Thetapemaybeeditedby cutting out unwanted

portions, or by joining selections into another sequence.

Announcements may be inserted between selections,

etc. Unused sections of tape can be spliced together

for re-use.

2. Forbestresults, cuttape at a slight diagonal,

join ends together with splicing tape on the glossy side

and trim off any excessive width.

Erasing Recorded Material-

Units having erase head the tape is erased auto-

matically when unit is in the record position, ff it is

desired to erase a recording without putting anything

on the tape follow the normal recording procedure,

but leave tJre "Volume" control set at its extreme

counterclockwise position.

ADJUSTMENTS

Removal Of Main Escutcheon-

To remove front panel, remove "tape feed com-

pensator", tapelifter (if used), the four panel retain-

ing screws at top and bottom edges and remove knob

from tape motion control (6). With motor turned off,

place tape motion control in forward position and lift

off panel (24).

Takeup Drive Belt-

If the takeup reel (20) does not drive properly,

loosen the idler bracket mounting screw (46) slightly

andmovebracketto right, increasing belt (13) tension.

NOTE: Tootighta belt will cause undesirable tension

on tape during play. Do not move arm so far

to right as to cause the lower corner to dig

intothe takeup reel hub when the Tape Motion

Control is placed in the rewind position.

Supply Reel Brake-

Place Tape Motion Control (6) in "Rewind" po-

sition, loosen brake bracket mounting screws (4?)

Blightly and so adjust bracket that pad (28) is just

clear of supply reel hub (2?). Tighten screw. With

this adjustment properly made the brake spring will

Page 4

be forced away lrom the bracket approximately L/ 64

inchwhenthe Tape Motion Control is in "Stop" position.

Rewind Drive Adjustment-

Set rewind drive adjustment nut (25) so that

spring (26) does not bear on bearing bracket when

Tape Motion Control is in "Stop" position. (This

adjustment must not be changed after setting supply

reel brake adjustment. )

Takeup Reel Brake-

No adjustment is provided or necessary. Fail-

ure could oceur only because of excessive wear or

damage to pad (18).

IIead Adjustments-

Head height is determined by fixed spacers.

(A thinner spacer is provided for erase head (21) be-

cause of added track width. ) Each head is factory

adjusted using a very high frequency alignment tape

and special indicators. Do not attempt azimuth ad-

justment unnecessarily.

To adjust head face parallel to tape, loosen

retaining nut slightly and, using constant frequency

tape, turn head (22) to obtain position providing maxi-

mum volume oscilloscope, or meter indication.

(Adjust azimuth before completely re-tightening nut. )

To adjust azimuth use a suitable allen wrench

andadjust.thetwo set-screws alternately for maximum

indication. A high frequency tape (at ieast 7500 cps)

is necessary for precise adjustment. Tighten retain-

ing nut and check to see that no reduction in output

results. Use of an oscilloscope or output meter is

essential. The procedure for adjustment of binaural

heads is indentical. An erase head requires no azimuth

adjustment. Merely position the head so face is paralLel

to tape.

Adjustment Of Tapelifter And Pressure Pad

Assemblies-

NOTE: Pressure pad assemblies can be used only on

binaurai or erase record head assemblies

(two heads). Thetapetifter mechanism, how-

ever, is adaptable to single head unit.

Adjust cam (53) on shift rod (14) so that it is

barelyin contact with lifter when Tape Motion Control

is in forward position. See that lifter assembly (in-

stalled after front panel is in place) is bottomed on

mounting screw. Bend tapelifter support slightly if

necessary to bring tapelifter fingers parallel to face

of head and approximately l,/16 inch above top of head

bracket (20) when Tape Motion Control (6) is in rtstop'

position, When installing or readjusting a pressure

pad assembly (5?) it may be necessary to bend the

pad holder spring (59). With the tape motion control

in the I'Forward" position, the pad rest squarely and

very lightly on the face of the heads and on the tape

path. No appreciable flexing of the springs should be

noticeableasthepressure pads are raised to the lifted

position. The mounting screw is accessible after the

panel is in place only if the tape motion control is in

the "StopI or t'Rewind" position,

Adjustment Of Tape Feed Compensator-

The purpose of the "tape feed compensatorl is

to absorb and average out the slight variations in tape

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speed which can result from tape - sticking, cracked

of warped suppiy reel, or an unbalanced winding of

tape. Adjustment is not critical. The position of the

compensating spring (9) should be such that it clears

the supply reel (2?) bV approximately l/ 8 inch at its

unsupported end. The "tape feed compensatortt must

be installed after the front panel is in place.

Capstan Drive Belt-

To replace th.e drive belt (32), remove the three

nuts in the triangular capstan rear bearing plate (3?),

remove plate and loop new belt over motor drive

pulley (43). The large diameter groove is used for

7 L/ 2 ips and the smaller groove is used for 3 3/ 4 ips

operation. Place belt (32) over capstan flywheel (31)

and replace bearing plate (37). If capstan rear bear-

ing plate (3?)has been bent or is improperly installed,

binding may result with loss of proper playing speed.

TROUBLES

Fails To Rewind-

1. The small rubber ring (42) loose or broken.

To replace the ring, insert a small screw driver under

ring and slip it over drive ptrlley (43).

Wow-

l. Check for flat spots on pressure roller (3).

To replace pressure roller, pull off cap (1). If

additional grip ring is provided, rernove ring by

spreading with screwdriver. Take off felt washer (2)

and replace pressure rolter (3).

Fails To Takeup-

1. Takeup belt (13) loose or broken, replace belt

if broken.

2. If takeup reel (15) does not drive properly,

loosen the idler bracket mounting screw slightly and

move bracket (10) to right, increasing belt tension.

Recorder Fails To Playback-

1. Checkplayback-recordheadfor proper align-

ment.

2. Check the recorded tape to see that the dull

side of the tape faces the playback head (22).

Poor Frequency Response-

1. Accumulation of tape coating residue on the

record-play head.

(a) After the "Viking" has been used for

sometime, themanythousands of feet of tape

passing over the heads may have deposited a

film of gum dust and dirt on the laminations.

This film will reduce the efficiency of the

recorder. This accumulation of tape coating

residue and foreign rnaterial should be

periodically removed by the use of a small

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6X4 12AX7

5879

CHASS IS P860 PREAMPLIFIER

:'.

P860 PREAMPLIFIER

RP61 RECORD.PLAYBACK AMPLI FI ER

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Page ll

cotton swab on the end of a toothpick and require no further attention.

carbon tetrachloride as the cleaner. Be

careful not to mar the laminations as they An occasional cleaning out of foreigrr matter

should be smooth to operate properly. under the Main Escutcheon (24) is desirable. and a

small drop of oil on the sliding lever members is ad-

2. To much or too little bias. visable.

(a) Thiscanbecausedbythe frequency vary- CLEANING

ing from the desired 60 to ?OKC. Check and

replace the faulty components. The record head (22), capstan (31) and pressure

roller (3) are subject to an accumulation of tape coat-

LUBRICATIQN ing residue, which is worn off the tape as it passes

these parts. Use a soft cloth and alcohol to clean the

All rotating parts are provided with generous head surfaces, capstan and pressure roller.

size oilite bearings, which are factory lubricated and

MECHANICAL PARTS LIST

Ref .

No. Part

No. Description Ref .

No. Part

No. Description

D346

D35?

D3I2

D35?

D-3428

D3I4A

D3l5

D339

D316

D332

D334

D36l

D34OB

?5 -5

75 -1

D33l

D318

D335XA

Retaining Cup

Felt Washer

Pregsure Roller

Felt Washer

Head Cover

Tape Motion Control

Tape Feed Compensator Includes

the following (?, 8 and 9)

Cover Retaining Screw

Spri.ng Cover

Compensator Spring

Idler Pivot

Idler

Spring

Takeup Belt

Control Link

Takeup Reel Hub

Takeup Reel Bearing

Control Arm

Brake

Spring

Bracket

Erase Head

Record-Playback / Monitor Head

Head Support Post

Main Escutcheon

Control Adjustment Nut

Control Spring

Supply Reel Hub

Supply Wheel Brake

Base Plate

Switch Cover

Capstan Assembly

D359

D325

D362CA

D333

D-368AA

D36BXA

Motor Belt

Motor Mounting Bracket

Shock Mount (3)

Washer No. 12 (6)

Nut No. 12-24 (3)

Outer Bearing Plate

Washer No. 12

Nut No. 12-24

Motor Assembly (Inctudes 33, 34,

35 and 36)

Fan (with set screw)

Drive Belt

Pulley

Supply Reel Bearing

Spring

Idler Mounting Bracket Screw

Brake Bracket Mounting Screw

Tapelifter Assembly Includes the

following:

Lifter Slide

Slidewasher

Lockwasher (2)

Slide-Mounting Screw (2)

Lifter Cam and Screws

Slide Tension Spring

LiJter Attachment Screw (1,

Tapelifter

Tapelifter, Pressure Pad Assy.

(Same as Item 48 except (56)

omitted and add the fotlowing: )

Lifter and Pad Holder Bkt.

PadHolder (Spring & Pad)

Pad Holder Mtg. Screw (l)

Pad Cover

Page 12

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