Recent content by 9C1Driver

Assuming you have a good mic and the speaker is working properly it could be a bad audio IC chip. Newer radio's have lots of settings and controls, double check those as well.

So is this an older news release or bulletin? I thought MFJ shut down and ceased its manufacturing operations back in May of 2024?

lol yup post number 10.

No. It appears you either have a jumper issue or your amp needs some work or both. It is common for Palomar and Texas Star amplifiers to not be properly matched for a 50ohm load.

https://klondikemikescapkits.com/ He is also a forum member.

That's a very nice older amplifier. Class AB with some filtering, should do great on SSB. As stated don't overdrive it. If your radio has variable power start with say a 1 watt AM dead key with the amp on Max. See what the dead key is, your shooting for for a dead key out from the amp of 70-80...

Chevy went to Blue engine paint in 1977.

The 454,455, and 3749 were all very very similar. The amp builders of that day would purchase these finals in large lots, they would build the same amp with any of the above finals. There would be no real functional difference. (note they would use the same for both finals, no running one 454...

Great little amp for SSB use. Bought one new in 1997 from Thomas Distributing for $89 lol. I'd buy 50 at that price today. Mine had the SRF3749 finals. Just don't overdrive it and if your a long talker add a fan on the top. Nice clean looking amp.

I’m sure it would be SSB capable, if the delay is not switched then it would have an auto ssb delay. That pic is a nice clean amplifier.

What antenna is it? I think an older IMAX 2000 can cover 2-3 MHz with an SWR of 2 or less.

Wow that looks like a pretty cool option. Going to suggest that to a local. HRO has them on sale right now, just add the mars mod and should be good.

I would plug in an external speaker to test the radio speaker. After that double check the radio settings, maybe the squelch is wide open or something simple.

Nice amp. Assuming you have a true peak reading watt meter on SSB I would run 8-12 watts PEP into it. It will loaf along at that drive level and run perfectly.