Almost looks like the Baojie BJ-300 Plus Power Amplifier

I've had the same amp for years and thought it was just mine that had the HI and LO output wired backwards. Apparently the backward switch wiring is a systemic issue. It is a very low-drive input amplifier... it takes very input to overload the final RF stage. I use mine with an HTX-10 that normally has a 7w output. It was a chore getting the output down to about 3-watts and even that is a bit too much drive for the amp. The other thing I think about are the harmonics this thing generates. I've never had a reason to crack the case, or look at the signal through the o'scope, but I'm guessing that there is zero low-pass filtration on the RF output.

Thanks for the video. I have the same exact amplifier and it works pretty well for such a cheap and wideband amp. while i was successful in making contacts both locally and DX with it i decided to stuck it behind an antenna tuner and have had much better reports and over better results.

Nice review on the easy bake oven.

I have a later version and on AM it cant be driven by more than a 1/4 watt!!! On low, the swrs go up over a 3! Got any hints or ideas?

The 1104 is a 2 meter device ..yes it will work at 3-30 ..but it's designed for vhf... It's 75 watts .. very very low drive

Thanks alot for the upload. Ive spent a year researching the high low button being released reversed on this exact model. The box insert said one thing, the seller webaite said another. I have the same radio shack meter as you and it confirms the button is reversed. Im puting in 1.5 watt deadkey from a cobra 25. Ill have to open her and turn the output power down to 1. I saw another video by 183getdown he puts a better resistor padding on the input but i don't think he knows the button is reversed.

I'm fixing to pick up a 200 watt off Amazon apparently these do ok

What will it do on SSB? I never run Am anymore nobody's on it only SSB and I see these amps for 120 bucks on eBay I would like to get one as a backup to my 500. Great video is always brother

Do these have to be converted? On the rm Italy website it says 28-30 so would it be out of resonance on 11 meter?

thinking about getting one of these. so the left switch is power, middle switch is AM/SSB, and the right switch is padding? whats padding?

Dang, you sound like a dude I would have loved to have hanged out with back in the late 70s / early 80s. Maybe could have sat down and smoked a blunt or hosed down a couple of beers, and had ourselves a really good pow wow...LOL. When I was teen, I remember buying that red amp on layaway from a Greek electronics store on 45th Street, New York City. That store is not there any more. There were a lot of Greek electronic stores on that block back in the day. As with the rest of Times Square, everything has since gone out of business, been relocated, or torn down for redevelopment and to make room for restaurants as per city code enforcement. I am truly fascinated that they still make these things. Unfortunately, I didn't have all of the bells and whistles for testing out my hookup, so it was not long before I blew the finals on my midland radio. How did you roll it back so that only one watt goes in? By the way, what's RMS? Peace!

Carier goes up on swing modded radio. Might do better with galaxy with out swing kit. With padding on ,I can run 3 watts does not back up on mfj tuner with internal dummy load. 50 watt dead key.

Use it on ssb. Only mode worth using anyway. Fuck a carrier.

Bird

what is the output power of this amplifier on 27500 usb?

Hi Sir, I recently acquired a BJ 300 that is a copy of this or other Linear. When keying in LO my Radio (Yaesu 857) gives SWR warning in Hi no warning. Any idea why ? Pls Help.

Hey man, whats up? Do you know anything about the new ones with a fan?

I know nothing about amps. Never had one. I have a galaxy 959 that will dead key 2 watts with power all the way down and does 32w peak power. What's a good small amp for me ?? I'd like to have 200w pep or so

The Bias Pon these amps is Terrible for SSB , It's ok ish for AM , But for SSB it's awfull , A real raspy transmission that's clippy , I had to modify mine and redo the Bias , It's now much better on SSB , Still some slight raspy-ness , But much better and much cleaner on the scope .

wow)

did you ever tested a amp with a mrf 455 in it?

O, o, orio, orio😂😂😭😭

I am getting this amp with the fan option, does it work between 3 and 30 mhz as they advertise. I will use with my G90

how many amp power supply would you need to run this at home?

Just test it on fm, in fact from now on, fm

Looks a lot like a rm

Check your s.w.r. on the radio....it will be very high....pure shite!,,

I have notoced the Waveform they generate isn't a sine wave. It would generate a more peaky signal even with a lower average. (Harmonics would be the Concern).