25MHz Dual-channel DDS Arbitrary Waveform Function Signal Generator Specs are:
Frequency Range Sine Wave
Normal Modes: 0.01Hz~25MHz

Square Wave 0.01Hz~6MHz
Triangle Wave 0.01Hz~6MHz
Sawtooth Wave 0.01Hz~6MHz
Arbitrary Waveform 0.01Hz~6MHz
TTL Digital Signal Wave 0.01Hz~6MHz I'm using it on a old tube type 300 watt single channel ham Linear Amp