QRMs and Professional Rack-mounted HF Receivers vs. Hobby Grade Ones

[yahya]

I am interested in your experiences in combating QRMs, especially in agglomerations and how the selection of receivers and ancillaries helped to mitigate that problem. How would you compare older professional-grade 19" rack-mounted HF receivers used with preselectors to what is currently available on the marked as moderately priced equipment addressed to HAMs and enthusiasts, including SDR receivers?

I always thought that the professional rack-mounted HF receivers outclassed in most cases the cheaper but contemporary rig addressed to the amateur market. Since the QRMs became a serious problem to many SWL and HAMs in big cities in the recent decades, I wonder if looking for such a professional 19" receiver with and an external preselector is worth the cost considering the possibility of equipment failure due to the aging. Collins, Harris and many other 'big radio' companies made professional external preselectors, both manual and, later, controlled from the receiver.

What in your opinion would be a match to such a 'professional' 19" set from the contemporary array of amateur market products available today?

 

[merlin]

It is very hard, even with the high end rack and Mil receivers. Where those are employed, most have extreme antennas like the full HF log periodic 100 foot up or the T3FD at 80 foot, possibly even full wave Rhombic. These pull in even the weakest of signals, enough to get a decent signal to noise ratio.
When you say 'outlast', there are 50 year old tube radios, like the Hammerlund and R390-URR still being used.
My main SWL receiver is my Kenwood TS-440S, bought used in 1981. It sits here now, listening for a SW station in Germany.
Wish I still had my R390 and FRT-24D
Maybe look into some of the better AOR receivers.