RF-403 VHF FM RADIOTELEPHONE

[n4rrh]

I have three of these radios, RF-Communications VHF FM. 403. one new in the box. I was told they are commerical type radios. They are black and a nice size radio. 13x13x5. Has in print on the back, fcc no. RF-403-2 Made by RF communications. I have no idea what they may be worth. Any help would be appericated. Thanks Reggie

[N9MS]

I was given an RF-403 but it is missing the final amplifier tube. What is the final in this thing?