The T4X and the T4B differ very little, except mostly in the PTO dial plates. The T4C functionally was not much different from the T4B, except in areas of operator convenience. The T4C is noted for the following major differences:

• Separate BFO Line
• FETs in the BFO oscillator
• Different method of ALC detection
• VOX on/off from front panel
• Controls moved to back of set
• Dual concentric PTO dial plates
• Plain chassis
• Meter switch activated by pushing LOAD control shaft
• Active PTO indication by dial light
• Blank RCA jack holes for VHF transverter drive kit
• Separate VOX delay controls for SSB and CW