Electronics > Beginners
are there counterfeit power rf transistors
OwO:
If you are just looking to build VHF power amplifiers then I would go for more modern cellular base station MOSFETs like the MRF9060MR1 or MRF5S9070NR1 (search M9060M and M59070N). They are usually refurbished parts and go for ~$3, but can operate down to VHF as well (internal matching becomes no-op at VHF) and are rated for 60W. At 12V you should be able to get around 10W.
CJay:
I would want the TO-220 parts for refurbishing/repairing old equipment than building new, there is little point speccing obsolete parts for new builds so sources of reliable and cheap parts are always useful
bd139:
Can't really win with that. Everyone knows that scarcity makes money now and what stuff is worth looking at ebay sold listings. Opportunities arise if you look at parts now. For example, about 25 years ago I saw a box of about 40 Eimac tubes for £20 at a hamfest. I just skipped over it. Meh tubes. Not interested in that. Now about 40-50 quid a go :palm:
I'm hoping IRF510 will go obsolete as I have over 200 of them :-DD
CJay:
FQP13N10 for me, I've a stash of about 200.
daedalux:
I think power RF transistors are the most counterfeited of them all. The TO-92 (small signal) and TO-220 formats in particular if the supplier is not reputable can be any crap, and many times you'll drive yourself nuts because the fake thing has the same junctions as the original and it could possibly half work for some random time.
Other packages may also be counterfeited, but most of the time they tried to build it and they may be working fakes or quality control rejections. Or it may just be the part code made to spec by some proper factory. Be very aware with any final power transistor for a transceiver, as they are on high demand for repair work at the lowest price.
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