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Selecting Proper Transistors for IF Amps

Jul 8th 2021, 00:27


Joined: Aug 25th 2016, 23:32
Total Topics: 0
Total Posts: 0
I have decided to build up some IF strips. I've never done this. I would like to see a discussion r.e. choice of transistor (what, aside from Ft determines a good candidate?), and I would like some recommendations of various types (i.e., some BJTs, some mosfets, or other types) so I can look up their specs, and maybe buy some.
Oh, and if there are other comments r.e. IF Amps, I'm interested. Also feel free to PM me at
Thanks, Bob, WB5EMX
Jul 8th 2021, 07:29


Super Moderator

Joined: Apr 4th 1998, 00:00
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Total Posts: 0
From what I've heard, you ideally want vintage junk box transistors, as their are a lot of counterfeits on today's market. Alternately, you may want to buy in quantity from a reputable electronics distributor.

Sometimes distributors will have great deals on parts they are closing out because they are no longer suitable for use in new designs.
Free parts--just send an SASE with $5 postage!
Feb 4th 2023, 17:36


Joined: Apr 2nd 2013, 18:33
Total Topics: 0
Total Posts: 0
RF transistors have evolved forward from the old 2n5109 that was developed for CATV amplifiers. NXP has a series of best transistors with much lower noise and higher frequency response and gain. I prefer their BUF520 for all receiver amplifier applications such as pre amp and if amp. see
If you want more specifics I contact me and I will send a schematic or gerber file for printing a circuit board. AK4VO

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