[1000mp] MPV Driving Amp

[Win]

I have heard, or read on this list, that you should not drive an amplifier with the tuner in line. I am sure that there is a good reason for this, but I can not, for the life of me, figure out what is is.  

Yesterday, when a DX station I needed appeared on 15 meters, I switchewd the amp over and started tuning.  The SWR going into the amp was 2 to 1, limiting my drive.  This is probably because of some mods I made in the amp.  In any case I turned on the tuner and matched to the amp, and made the contact.  

Correcting the problem with the amp is nothing more than adding a cap to the input circuit the nexty time I am into it..  I still ponder, however,  why I should not use the tuner into the amp.  I have done this before many times with other rigs using passive external tuners.

Win