40A/B Transmitter

THE COLLINS 40A/B TRANSMITTER

The 40A/B was Collins’ first desktop phone transmitter. Based on the 30W, it added a 9C Amplifier-Modulator and antenna tuner unit. Plug-in coils for 160, 80, 40, and 20 meters were available, with the coils for one band being standard. The unit was priced at $235.00 including either a 34″ table rack, or standard 60″ floor rack. It first appeared in the Collins QST ad for October 1932. The 40A was cw only.

The 40B ran 30 watts and covered the frequency range of 1,715 to 14,300 kHz.

An external input amplifier, the 90C, provided the necessary gain to drive the transmitter with a condenser or double-button carbon microphone ($32.00). It used two type 56 tubes resistance-coupled and had a flat frequency response from 80 to 8,000 cycles. Power for the 90C was obtained from the same batteries as used for the receiver or condenser microphone.

A model 5A Broadcast qualilty Condenser Microphone was also offered. It used a pair of 864 tubes and came with 20 foot shielded cable and steel battery cabinet.

The 5A was priced at $125.00 and the 90C amplifier at $32.00.

• CCA COLLINS HISTORICAL ARCHIVES
• The Pre War Years
• 150 Series Transmitter
• 2A, 2B AND 2C TUNERS (ATU)
• 30FX Transmitter
• 30FXB Transmitter
• 30FXC Transmitter
• 30FXR Transmitter
• 30J Transmitter
• 30W Transmitter
• 32 A/B Transmitter
• 32F Transmitter
• 32G Transmitter
• 40A/B Transmitter
• 45A Transmitter
• 4A Transmitter
• Bulletin 100
• Bulletin 101
• Bulletin 105
• Bulletin 200
• Bulletin 200A
• The Lost Decade
• The War Years
• Post War Broadcast / Commercial
• The Black Boxes
• The Grey Boxes
• The “S” Word or Solid State