- Power output:
- Mode: CW
- Frequency: 500 kHz
- Status: Display only (parts missing)
The 666 transmitter was used by the New Zealand Post Office for 500 kHz CW.
It was later modified for AM in the broadcast band.

The 666 transmitter was used by the New Zealand Post Office for 500 kHz CW.
It was later modified for AM in the broadcast band.