You will get more helpful suggestions if you can post the model of the Fisher as well as the rest of your system.
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Clipper, you may want to contact tubesforever on audioasylum/vinyl.
I think he is a big fan of the Cornet and upgraded the caps and built a separate power supply.
In any event, he should be able to help you with the hum issue as I believe that is why he played around with it.
Take all the above with a "I think". The memory is getting scary.
An obvious move as you yourself have noted is to get a linestage to compliment the Hagermann Phono strage or better yet get a full preamp that has a phono stage built in. The best sound however will require a tube power amp as well IMHO.
I have just read an ad from Music Direct. They have a Demo Super Amp Mark 2 by Audio Electronics the Cary subdivision for sale. It develops 40 wpc in a PP configuration and uses EL-34 power tubes opposed to the EL84 tube or variation thereof that the Fisher has. The best part is that it is priced at $995 and being a demo you get the benefit of a factory warranty.
I am a big fan of AE. I found my Nirvana using there octal tube based preamp. You can still get the preamp in the basic model from Upscale Audio brand new. The only issue is that the only AE-3 mark 1 preamps he has left, have the remote volume option which adds up to approx $800 with $300 of those dollars being eaten up by the remote option. The power amp also uses 6SN7s and a 6SL7 for input tubes making it very easy to afford tube rolling if you wanted to . I highly recommend rolling the tubes you will be surprised how much impact that different tubes make.
The Klipsch will thank you for the more powerful amp because despite the high efficiency the woofer will take all the power you can give it and the added bass is obvious. In turn this yields better tonal balance than very low powered amps give you with Klipsch. Yes you can make the speaker painfully loud with a low power amp but the sound is almost all squaker and tweeter.
Even if you don't care for AE there are many amps being offered these days on the used market that are in the affordable bracket for most audio nut heads.
Best of luck