On Wed, 17 Oct 2012 23:49:08 +0200, Theo wrote:

HI,

I've several VHF transistor that could run about 50W.
I wonder if they are able to work under 3,5, 7 or 14 MHz ?

Thanks a lot for your answers

Teo

Generally, a transistor designed for VHF will work well on HF, and with (much)
higher gain. When that is ignored, it could be a reason for instability though.

Jan