<Screen voltage is well regulated so i am thinking IMD is from tube.? 4CX1500B swap will be possible but very <expensive ...? much more better amp is around and make here with full service support.
<Dont waste a buck on this.
<This is my opinion..
<Guillaume VA2NA
##? Nothing wrong with the pair of? chinese? FU-728's.? ?The? OM-4000? also uses a pair? of FU-728's, and when used with an ANAN- 8000,? IMD is? -70dbc? ? for? imd? ?3-5-7-9-11-13 .... and that's at? 4+ kw pep out.? ?But that is when .....' pure signal'? is? being used.... and the? sample is? derived from the linear .? ?KA0KA has the anan 7000 /? om-4000? setup. On the waterfall display,? on ssb / essb .... it drops off over the cliff asap.?
## But? really,? if? you want to run? 4+ kw pep? out, use a real tube, like a 3CX-3000A7.??
