Hi Jim,

MFJ does have quality control problems, but if you get one that is in 
good working order you will have a great tuner.  MFJ does stand 
behind their units if you find a problem under warranty.  I had no 
problem with mine.  If you are running a Kenwood and have the right 
cable, the antenna button on the Kenwood will cause the power to drop 
while tuning and tune the MFJ to resonance.  A button on the MFJ 
allows you to switch between two antennas, so if your transceiver has 
two antenna jacks you would only use the one that runs to the 
tuner.  The manual is available recorded if you would like to read 
more detail about it.    If you have specific questions, I'll try to 
answer them.

73,

Dave, W7OQ

At 06:10 PM 12/8/2015, you wrote:
>Dave, I also use an ALS 600 amf which I got used and like very
>much.  I would  like more information about the MFJ-998 tuner.
>HRO recommended me not to buy that one so I ended up with an
>LDG-AT600 which I used for 5 minutes and found it not very blind
>friendly because it used a series of LED's on the front panel.  I
>think they also said the quality control of the MFJ product was
>not very good so I am tunerless at least when I use the amp.
>Fortunately, the amp as you know has good protection against too
>high an SWR so it just clicks off if it doesn't like the signal
>coming back down the coax.  Would like to hear more of your
>observations about the MFJ-998 tuner.  What is the price for it?
>Thanks and 73, Jim WA6EKS