Hello, I own an old and very cool trace elliot gpx 250. I love it. I'm looking for a second bass ( and double bass ) head amp. I don't need a high end amp. I want a back-up head for my Trace elliot and left it at home and use the second amp for little gigs etc I want to preserve my old friend. I'm considering 3 models : eden terra nova https://www.thomann.de/fr/eden_terra_nova_tn501.htm TC https://www.thomann.de/fr/tc_electronic_bq500_bass_head.htm Warwick lwa 500 https://www.thomann.de/fr/warwick_lwa_500_black.htm They offer similar options, watts power etc... I notice that the tc is build with a mosfet preamp ? Is it better than the others ? Thanks for your tips and advises. Have a nice day.