Hi I have this amp , is use gi-7bt http://www.qsl.net/yu1aw/1xGI7Bshema144.gif But i would like to replace for gi-46b Is just plug and play or i need mod ??? (except this tube is not same size .socket cheminey .) Is need mod in RF ??? Pascal Carrier VE2WHZ www.hamantenna.com Po box 151 Amos, QC J9T 3A6 Canada