Hey everyone what’s your opinion on this amp. Is it good to use on 20-40 meters or is it garbage good only for Cb type use?
Although I have not seen this operate with the aid of tools like a spectrum analyzer, I would bet that it says 80-15 because when you transmit, you're on 80 through 15. I would use it to learn about solid state amps, but only with the assistance of a dummy load.
It's a CB amp. Schematic is here. With some work in the bias section and an external low pass filter it would probably be ok for 10m, maybe 12m. My guess is that the input tune wouldn't be any good much below that unless you rework it a little. It's good for maybe 150w or so clean. NCR is right, good project amp to play with and see how they work, maybe boost up a QRP rig to 100w or so, that's about it.
That's cute, and funny! Yes, if it doesn't have a bandswitch or some form of automatic band sensing, it is extremely unlikely to meet Part 97 requirements for harmonics since any filtering it has will be a low-pass filter with a cutoff above 30 MHz; so harmonics from 80, 40, 30, 20 and possibly 17 meters will just flow right through. It may meet spectral purity requirements on 10, 12 and 15 meters. Maybe. I wouldn't use it.
At least not without proper bias and additional (external) filtering. IMHO, probably NOT worth the time and/or effort.
I see the OP created a duplicate thread about this amplifier here: http://www.eham.net/ehamforum/smf/index.php/topic,126723.0.html. The root directory (http://www.cbtricks.com/Amp/messenger/class_ab_model_350/) has this note posted: FWIW, the schematic shows there definitely isn't ANY harmonic filtering. See my reply to your question about posting images... in your duplicate thread.
