Hello Phil: I wondered about replacing all eight trans myself, but Gary at TT says that is the only safe way. I gather the reason is that (I am told) the trans must be matched in current drain or tro
Hi Sam... Gary and I almost never disagree, so there is probably something here that I am missing. But: The transistors are graded into beta (gain) groups as they are manufactured. The transistor cas
I have seen RF transistors that check OK for continuity and will even make full power on 20 meters, but they drop off on the higher bands and sometimes on the lower bands. These transistors have a mu
Hi Dave... If that is true, and two vastly different transistors found their way into the same beta group, then it would also be true of not only the transistors already in the amplifier, but any can
I have repaired dozens of GE Mastr II 100 Watt UHF PAs, and a few VHF ones too (the VHF ones have reverse power protection and do not fail as often). I have opened up the PA transistors (not recomend
Just to keep the record straight...I did not suggest replacing only the one that went bad, but also its mate in the p-p amplifier as well, being mindful that they should be matched and in the same be
Hi Phil, The amplifiers I was working on had 4 final PA xsistors. All four were driven from a single power divider and their collectors fed a single power combiner AND all four had a common bias. The