8TMOT - ADJ

Our universal adjustable speed motor and speed control board
was roughly one full year in development, and is the motor we
most commonly use due to its adaptability to almost any unit.

This motor is included with all Ford, Mopar, AMC and Wollensak
restorations, and is offered as a quality and reliability upgrade
on many home units for higher torque and less wow and flutter.
BARRY'S 8 TRACK REPAIR

Anticipating future failure trends, we've spent the last several years
"sweeping the floors" of the few remaining 8 track parts sources
and purchasing all motors that were available.  Unlike other parts,
there is no modern substitute for the motor in an 8 track machine.

To replace a motor, we must first determine the DIRECTION OF ROTATION and REQUIRED RPM.
If your pulley and flywheel are on top, you will need a motor with CCW rotation.  If the pulley
and flywheel are "upside down", you will need a motor with CW rotation.  Then we figure RPM.


To determine required RPM:

If your motor still runs but speed is inconsistent, we have the apparatus to measure RPM and
simply measure the RPM while the speed is correct.  If your motor is dead, we designed the
BFM-1 Motor Simulator and RPM Gauge which makes this a one minute procedure,
Occasionally I prefer a mental challenge, and have devised this formula to figure required RPM:

1.  Determine capstan diameter.  The capstan is the vertical steel post to the right of the playback
head.  It will be either .25 (large) or .18 (small).   Multiply this value by 3.14 to arrive at your
CAPSTAN CIRCUMFERENCE.  Note that a cassette capstan will be much smaller than above.

2.  Divide 3.75 (or 1.875 for cassette) by CAPSTAN CIRCUMFERENCE, then multiply
that result by 60.  This will be your CAPSTAN RPM.

3.  Divide FLYWHEEL DIAMETER by MOTOR PULLEY DIAMETER.  Call this result X.

4.  Multiply CAPSTAN RPM by X.  This is your REQUIRED MOTOR RPM.


In about 75% of cases, we should arrive at something very close to 2000, 2460 or 3000 RPM.  The vast
majority of 8 track motors operate at 2000 RPM, but not all.  Keep in mind that actual RPM will usually
be 30-40 RPM lower once motor is installed and loaded down by the drive mechanism.  In most cases,
RPM is correct "as is", but it is possible that internal adjustment of the centrifugal switch is necessary.

To save time, we often substitute an adjustable speed, tachometer controlled motor which is adaptable
to almost any machine.  A new motor is INCLUDED with all Ford, Mopar, AMC and Wollensak restorations
and is considered a quality upgrade - outside of our flat rates - on most other 8 track machines.  Below
are pictures and descriptions of the motors stocked and installed ONLY by Barry's 8 Track Repair.
8TMOT - 1

2000 RPM    CW or CCW rotation with internal pulse generator

Diameter 1.75"        Length 1.95"        12V, 50 mA

Matshushita part # MYF-15AF3
8TMOT - 2

2460 RPM        CCW rotation with Fast Forward

Diameter 1.62"        Length 1.80"        12V, 100 mA

Unknown manufacturer,  part # 440417N
8TMOT - 3

2400 RPM        CCW rotation

Diameter 1.59        Length 1.48        12V, 100 mA

Audiovox type M4 for home and car units, part # 279-04
8TMOT - 4

2000 RPM        CCW rotation with Fast Forward

Diameter 1.80        Length 1.60        12V, 80 mA

With pulley,
exact motor for AkaI CR-83D
8TMOT - 5

3000 RPM        CW rotation

Diameter 1.82        Length 1.90        12V, 50 mA  with grooved pulley
8TMOT - 6

2000 RPM        CW rotation with Fast Forward        Nippon part # NAM - 3A

Direct replacement for some Lloyd's, Realistic and other models.
8TMOT - 7

2400 RPM        CW rotation

Diameter 1.625        Length 1.50        12V, 80 mA       Mitsumi  M40A2-2S
We Even Have Complete, NEW Transports
Tips for perfect speed tweaking - non technician version

1.  First, look for a speed adjustment.  Some better units with onboard speed adjustments are Pioneer,
Wollensak, and some of the classic Delco 8 track machines.  They're usually not labeled, but are almost
always the control closest to the motor.  It never hurts to "adjust and return" an internal control; in fact,
it cleans them and eliminates noise from an old, oxidized internal connection.

2.  A tighter belt will slow down the motor, but place more wear on the motor and capstan bearings.
Cheaper manufacturers generally used a specific belt tension to set the speed.

3.  A larger diameter motor pulley will speed the machine up.  Wrapping layers of tape around a
pulley can increase its diameter in tiny increments.

4.  A larger diameter flywheel will slow the machine down.  Tape can work here too (I've never done this!)

5.  If you have access to a lathe, you can reduce the diameter of a pulley or flywheel.
BARRY'S 8 TRACK REPAIR
4783 N. Glenrosa Circle
Prescott Valley, AZ  86314
928-533-9666
(21 REF)
(15 REF)
(42 REF)
(200 REF)
(11 REF)
(18 REF)
(220 REF)
(58 REF)
The world's largest stock of NEW 8 TRACK MOTORS
8TMOT - 8

3000 RPM  CCW rotation

Diameter 1.81        Length  1.80   12V   Matsushita Part # MYT-11KF
(33 REF)
8TMOT - 9

3000 RPM    CCW rotation

Diameter  1.53         Length  1.96    Matsushita Part #  MYT-15MF

Has slightly more torque than 8TMOT- 8, otherwise similar
(315 REF)
8TMOT - 10

xxxx RPM      xxx rotation

Diameter   x.xx         Length  x.xx    Unknown mfr. part #  NEXD198
(10 REF)
All 8 track motors have a shaft diameter of 2 mm (standard size)
Manual E-mail address:  Barry8Track@cableone.net
BARRY'S 8 TRACK REPAIR stocks more than 1500 NEW 8 track motors!
To maintain my claim as the world's best-equipped 8 track repair facility, I have purchased the entire
known remaining world stock of new motors for 8 track machines.  You won't find them anywhere else!

Image

coming

soon
Our Inventory of NEW 8 Track Motors
A NEW
motor is
INCLUDED
on all Ford,
Mopar,
AMC and
Wollensak!
Sorry, we
are unable
to sell
motors
due to
limited
quantities
(360 REF)
.
NOTE:  By engaging our services, you are ALSO agreeing to our  TERMS AND CONDITIONS