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Reviews Categories | Ham Shack Accessories | MFJ-216 Help

Reviews Summary for MFJ-216
MFJ-216 Reviews: 4 Average rating: 3.0/5 MSRP: $90
Description: AmplifierSaver is supposed to allow safe tune up of a linear amplifier for full power output and best linearity.
Product is in production.
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HB9PJT Rating: 5/5 Oct 31, 2017 01:17 Send this review to a friend
Will work with Negative Key Volts  Time owned: 0 to 3 months
W9JCC's review is another example of "real hams never read a manual". Of course MFJ-216 will work with negative key voltage when connected as written in the manual. Just do it exactly as written there. Better read a manual than bashing MFJ.
N0JDN Rating: 5/5 Oct 30, 2017 01:11 Send this review to a friend
Worked good for year's  Time owned: more than 12 months
I have had one for around 9 years and they work great with several of my Kenwood radio's
W9JCC Rating: 2/5 May 6, 2012 13:16 Send this review to a friend
Won't work with negative key volts  Time owned: 0 to 3 months
My application requires keying an old SB-401 which uses ~ 15 volts negative at the key. One look at the MFJ-216 schematic will tell you that applying the 216 to a negative keying circuit will immeadiatly key the transmiter(Note D4 diode directly accross the output connector)I designed a new output stage (2 diodes, one resistor, and one $4.00 IC) capable of handling +/- 100V at 0-300mA at the key. One cut is required on the PC board. Would put the details here if I knew how to input the schematic, BOM, and pix. Anyone wanting to salvage a 216 for negative or positive keying can e_mail me at for the mod.
The cable provided has an RCA plug at both ends. OK for plugging into the 216, but not great for the key jack of the Xmitter. I cut one end of mine off to find the wires extremely light and hard to strain relief.
The PWB and box were well built.
VE6XL Rating: 0/5 Mar 22, 2007 22:03 Send this review to a friend
Stay clear  Time owned: 0 to 3 months
Puchased this item thinking it would be a good idea to extend the life of my amplifier. Found it did not work despite being brand new out of the box.

There really is no excuse for poor quality control like that. Far over priced considering there are less than 20 components in the whole box!

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