The RM HLA300 plus is a very good amplfier. I worked on Motorola radios for over 40 years. When I saw the original 500 amplifier used Motorola transistors. I was impressed.
It was a 60 watt transistor for class c. For AM this would be about 240 watts. The 501
amplifiers are 1446 are 70 watt transistors. The HLA300vplus will do about 500 watts ssb before the filters or on 10-12 meters. It will filter anything above 50 mhz. If you have
equipment to check harmonics you can run 500 watts. If you use the filters for 40 or 80
meters you will have 400 watts. I use a MFJ 75 amp power supply set for 14.5 volts. If
you use 12 volts or 13.8 volts it will not put out as much. I run 20 - 25 watts in. It does
have input protection and swr protection but if you put 100 watts in you will probably
damage it. I dont think they will ever use 2879 100 watt transistors because it takes a
lot more drive. The Ameritron amp uses these transistors. If you look on Eham you will
find some people have no trouble with the Ameritron 500 but others have nothing but
trouble with it being returned DOA. The Ameritron is about $300 more. I know RM Italy
makes alot of stuff for cbers but I dont think they would pay $200 more for ham filters.
I have a home made amplifier with a home made filters, but forget to switch bands and
have damaged it more than once. The RM Italy has auto switching and I like it a whole lot.
Don Johnson KC6SPU
