B.T.S. Indirect Drive Disc Television Kit K13

The B.T.S. Indirect Drive Disc Television Kit was a well-engineered, user-friendly mechanical television system, designed for home assembly and based on the Nipkow disc principle. Its indirect drive mechanism for the scanning disc offered technical advantages over direct drive systems, making it a reliable and accessible option for early television enthusiasts. The kit included all necessary components for immediate assembly, such as the motor, scanning disc, lens, lamp, and a pre-marked chassis.

Key Features
Indirect Drive Mechanism

• The scanning disc is not mounted directly on the motor spindle but instead uses a separate spindle running in moulded bakelite bearings.
• The drive is transmitted via an endless rubber band of circular cross-section, which acts as a mechanical filter to reduce vibration and noise.
• The use of pulleys allows for gearing down the motor speed, enabling the motor to operate more efficiently and within its power capabilities.

Motor

• The kit includes a specially designed motor with a heavy cast aluminium frame and ball bearings for durability and smooth operation.
• Two motor types are available:
  • Type K13: For 6-volt battery operation.
  • Type K12: Universal motor suitable for A.C. (40–60 cycles) or D.C. mains (200–240 volts).
• Motor spindles have extensions for adaptability to other uses.

Scanning Disc

• The disc is of conventional design with eight spokes and a central eight-ribbed boss.
• Either the spokes or the boss ribs can be used as a stroboscopic indicator for synchronization.
• The disc diameter is 16 inches.

Optical System

• A large-diameter single lens is mounted in a U-shaped clip for viewing the image.
• The lens holder and lens are included in the kit.

Lamp and Illumination

• The kit includes a specially treated beehive-type neon lamp ("TELELUX NEON Lamp") with a mask and special reflecting surfaces to maximize light output and conserve light.
• The lamp holder is made from bakelite.

Chassis and Assembly

• The chassis is made of laminated wood, with all component fixing holes pre-marked for easy assembly.
• The kit includes terminal blocks, mains plug (for mains versions), and both fixed and variable resistances.
• The synchronising gear is fitted and supported by an extension of one spindle bearing, ensuring alignment accuracy.

Instructions

• The kit comes with a full-size blueprint and detailed assembly, wiring, and operating instructions.

Performance
Motor Performance: The motor is robust and remains only slightly warm after several hours of continuous operation, indicating it is well within its power capabilities.

Reception Quality: When used with the Standard Television Receiver (as described in the February 1934 issue of Television magazine), the kit produced excellent pictures with effective synchronization, holding the picture steady for long periods.

Value: The kit was considered to offer remarkable value for its price, with the battery version priced at 78 shillings and the mains version at 84 shillings.

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