That's a class C amp.
As it says on the web page you pointed to:
>? ??This amplifier is not intended to be a Linear (for SSB use) - it is designed for single-band CW operation only.?
Jerry
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On Thu, Dec 12, 2019 at 08:49 AM, Arvo W0VRA wrote:
Anybody considering using a QRP Labs 50W PA with their ?BITX?
There's no band switching yet.