Here is a link to the Manufacturer's info on the RM Vla-150 Amplifier. RM has a good reputation, and I've used their HF Amp with great success & no problems. They are based in Italy. Hope this helps & here is link http://www.rmitaly.com/scheda.asp?IDGr=1&cat=0&tipo=210 Yours in the Hobby, Dave Walton - W7CAR Rainier, Oregon