[Jay Thomas]

I have an SSTRAN, which I use to transmit to my old radios.  A few of them, all with RF amplifier stages, distort when listening to the SSTRAN but not when listening to a "real" station.

I partially solved this by dialing back the modulation control on the transmitter.  All of them sound less distorted now.  I don't know if you have a modulation or gain control on your transmitter.  If not, maybe you can play around with your transmitter antenna length and placement.

It could also be that your transmitter is distorting the signal.  How does a modern radio known to be good sound receiving your transmitter?

My transmitter is an SSTRAN also.  I dialed back the modulation control, but the signal seemed better to raise it a little.  I am sure the transmitter is causing the distortion to the three cathedrals.  I have about 45 other radios that I have restored (1939-1952).  These all sound great with no distortion.  Just seems that the problem is with my 3 early cathedrals.  I have two of cathedrals in the same room as the transmitter where all of my radios are on display.  I may try to relocate the antenna like you suggest, or one of the radios into another room.
Thanks for your suggestions.

Jay