|8TMOT - DELCO
Currently being used only for repair jobs until we
develop the various physical adaptors to enable
the use of this motor in many different units, as well
as instructions for self-installation by the layman.
Please check back for updates
|BARRY'S 8 TRACK REPAIR
|NOS (New Old Stock) 8 Track and Cassette Motors
We regret that we have been forced to discontinue motor sales
due to limited quantities; they will be retained for repair jobs
only as of March 2013. If your unit needs a new motor, the only
option we can offer is to send in your machine for restoration.
To order a motor, you will need to know 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. If in doubt, simply
send me an image of the inside of your machine.
To determine required RPM:
If your motor still runs but speed is inconsistent and you have the apparatus to measure RPM,
simply measure the RPM while the speed is correct. If your motor is dead, we offer the BFM-1
Motor Simulator and RPM Gauge which makes this a one minute procedure, purchase it here.
Or if you like math and have patience, just use my formula to determine required RPM instead:
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 most cases, you 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 will be
necessary to get the speed 100% exact. MOTORS INCLUDE FREE E-MAIL TECH SUPPORT.
No refunds on motors - exchange only. Limit 1 per customer.
Internal speed adjustment is delicate and at your own risk.
|Brand new motors from Barry's 8 Track Repair:
|Note: All RPM ratings were derived from ACTUAL MEASUREMENT - not from trusting the specifications !
We can also CUSTOMIZE most motors, adjusting them to your exact RPM requirements - add $25 to price.
Since I don't have your machine in front of me, be sure to specify NO LOAD RPM. Most mechanisms slow
down an average motor by about 30 RPM, which is not noticeable to the average human ear. Speed can
also be tweaked by experimenting with belt tension, pulley diameter, tape retention force, etc.
To determine direction of rotation, look at motor with shaft facing you.
|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
|8 Track Motors
|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
|How 'bout the WHOLE DARN THANG ???
|Brand new (NOS) 8 Track Tape Transport Assemblies
Includes motor 8TMOT-7 with belt, pulley, playback head, track change cam, track change sensor,
tape-in leaf switch and tape spring retention device. Does NOT include the very common track change
solenoid/swing arm assembly, and was the core around which many cheaper manufacturers built their
own designs. Mechanism as a whole operates properly with 12 volts applied to the motor and the
playback signal fed to a stereo amplifier, and with correct speed. I thought this was a pretty cool find !
I've seen this mechanism in a number of non-audiophile 8 track machines; it is in fact probably the most
common mechanism I've seen. A new belt will be installed in this mechanism before shipping. The
"missing" track change solenoid/swing arm assembly can be salvaged from hundreds of popular junk
machines to make a custom-designed, fully functioning unit with the addition of a housing and a stereo
amplifier - or you can simply get a lot of good, new parts to fix up some old machines as a hobby.
New playback head and mount assembly only - 29.95
Half-inch diameter press-on plastic pulley only - 4.95 (sorry, they are rare)
|CASMOT - 1
Some weird dual motor assembly, no idea whatsoever;
My guess is that you'll know if this is the one you need!
With 2 pulleys. Manufactured by Yale, part # F54R02
|CASMOT - 2
3360 RPM @ 6 volts, 7000 RPM @ 12 volts CW rotation
Diameter 1.54" Length 1.45" with pulley
Unknown manufacturer part # 46.10.26
|CASMOT - 3
Canon part # MD39-R5CN-F 12 volts, with pulley
Too lazy to measure RPM today, please ask!
|Tips for perfect speed tweaking - non technician version
|Getting an 8 track machine to run at the exact correct speed has plagued mankind since before glaciers
covered the continents. The massive meteor that drove the dinosaurs to extinction eons ago was actually
gently guided towards the Earth by the uncomfortable strains of a slow-running 8 track machine located
in the distant galaxy of SIGMA-X3-21. I can't go back and change the past, but I can ensure a safe future.
Being a professional technician with an obsession for reliability (thus my LIFETIME WARRANTY), I always
go for the proper, at-the-root solution - take the motor apart, adjust the speed, put it back together, reinstall it
in the unit, check the speed, take it back apart, etc. However, this technique requires many years of
experience with electronics and fine mechanisms, a musician's great ear, and sometimes tons of patience.
I would never dream of forcing YOU to go to such extremes, when there are easier, less hassle-ridden ways.
Here are some handy tips I've picked up here and there, or at least imagined in my mind based on physics:
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.
|Please use E-mail only to discuss your needs in regard to a motor.
If we have a motor that will work for you, we will let you know and
you can call us make payment with a major credit card, check or MO.
ALL MOTOR PRICES INCLUDE SHIPPING IN THE U.S.
|BARRY'S 8 TRACK REPAIR
|4783 N. Glenrosa Circle
Prescott Valley, AZ 86314
|21 in stock
|15 in stock
|42 in stock
|212 in stock
|11 in stock
|18 in stock
|220 in stock
|58 in stock
|Please note that I strongly recommend paying me to replace your motor - I've had a lot more practice !
I cannot say which motor you need based on a model or part number -
Wollensaks and ALL car units must be sent in for motor replacement
|The world's ONLY source for NEW 8 TRACK MOTORS
|8TMOT - 8
3000 RPM CCW rotation
Diameter 1.81 Length 1.80 12V Matsushita Part # MYT-11KF
|33 in stock
|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 in stock
|8TMOT - 10
xxxx RPM xxx rotation
Diameter x.xx Length x.xx Unknown mfr. part # NEXD198
|10 in stock
|All 8 track motors have a shaft diameter of 2 mm (standard size)
|CASMOT - 4
With speed control board. RPM adjustable from 1800 to 2670 at 12V input
NOTE: The speed control board will not work with a different motor, as
the free-running speed of this motor is around 10,000 RPM.
|CASMOT - 5
2760 RPM CW rotation with 1-wire tachometer output
Diameter 1.57" Length 1.69"
|All cassette motors have a shaft diameter of .075 (standard)
|Manual E-mail address: BarryMusicTeach@aol.com
|BARRY'S 8 TRACK REPAIR stocks more than 1500 NEW 8 track motors!
|To maintain my standing 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!
that we no
|Motors are shown to prove that we are the
world's only shop who has them, and for the
We apologize for any disappointment.