| 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. |
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| 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. |
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| 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: BarryMusicTeach@aol.com |
| 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) |
