Eminent Technology LFT-8b in Harry's system

With the Covid stay at home order in MI I decided to play around with the .6MH inductor.  I tried the new Jantzen copper foil in wax 14 gauge, which is all the rave.  Sadly, it thinned out the mids with maybe a slight increase in detail.....btw I hooked them up in both directions and they were worse than Bruce's stock 18 gauge magnetic wire air cores which are very good. I debated on ordering the 12 gauge copper foil in wax but decided to go with the Erse XQ 14 gauge perfect lay air coiled inductors.  I'm glad I did as the moment I hit play the mids sounded rich and full like a good tube amp.  The detail was all there and so were the highs.  I did A/B Bruce's inductors and easily identified the Erse's every time.....by the fat juicy midrange.  If you have a large room and are looking for more meat in the midrange than the Erse's are the ticket.   Funny how the change in wire gauge(DCR) can make such a big difference in the mids.  I think the inductor switch is just as significant as changing the 470uf and 4.7uf cap.        

Great thread !!!!

Thanks @brucefrederick. I myself am considering sending the LFT-8b x/o schematic to Danny Richie at GR Research, seeing what he recommends as an upgrade. One can send him a loudspeaker for a free complete evaluation (he measures the speaker, including spectral decay---aka waterfall plot, phase relationship between drivers, frequency response, both on-axis and off, etc.) but the ET doesn’t require that, just upgraded x/o parts.

bdp24

I read through many threads regarding the copper foil wax inductors before pulling the trigger. Actually Danny was a fan of Erse inductors FWIW. The Erse’s are a stock item at parts express and cheaper than the copper foil in wax . I forgot to mention that the ET’s sound a lot fuller at low volume levels..... also the new coils tamed the slight harshness in the treble with female voices in many of my cd collection.