Pete, I guess it simply comes down to what power output for filaments and which tube you have! Otherwise I see no difference! On 3/23/2011 3:31 PM, Pete Lancashire wrote: > a side question. If one was building a 40 M xmitter from scratch for > fun would one want to use a 807 or a 1625 ? > > any reason one over the other .. I can't think of any. > > -pete