Amp's: Linear vs. Mosfet?

my 8 tube with 50 plus year old tubes runs perfect every day

 

FWIW
X force mosfet amps are filtered and an biased.
The thing that I have noticed with mosfet amps is they tend to be overrated and they drop power as they get hot.
I believe it's very important to choose the right one for your radio. I don't get on here much so if you need to ask, call me.

 

I don't know what you mean by filtered, not one of these CB amps are properly setup or made.

As for overheating and power dropping, that proves my point about a bad design.

 

Mosfet has been in use for CB "exports" for almost 10 years. Uniden is now using mosfet final transistors. Toshiba going out of business and copies being marginal at best leaves the affordable amp world for the avg consumer left little alternative for a DC mobile amp but mosfet or the Toshiba copies. Mosfets are here to stay whether we like it or not. All of the amplifiers on the market for the "10-11 meter buyer" using mosfets, as well as the radios using mosfets drop power to a degree the hotter they get. It is what it is, no need to argue about it.

Heard of Cheyschev filtering?
View attachment 53731
Back in the 80s, original Palomar amps (DC mobile) then later called Magnum, Elite, Cobra XL all were designed by the fine folks at Clear Channel utilizing muti-pole Chebyschev filtering and AB biasing for the cleanest possible DC amplifier.
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The same people designed the amplifier engine for the XForce mosfet amps
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NOT like the current named Palomar amps that have no filtering at all
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So back to the topic, yes there are decent mosfet amps available. They are reasonably priced. It is important to choose the right amp for your radio.

 

I agree with what you are saying, yes there are good things about Mosfets and I don't know much about the Toshiba issue, they were not the only supplier of transistors but that's not what I'm saying so to explain it while being obvious seems to be futile to me.

I have a kw sitting here on the desk that is all mosfet, I use it at a 100% dc and it doesn't over heat or degrade in power. I could even push it to 2kw ( done that when I was testing it) and it won't have any problems. I have two radios sitting here with Mosfet finals, not CBs but they have mosfets. The one reason why Uniden is using them is because of costs.

By the way, the American CB consumer looking for 11 meter amps is stuck with what they get, seeing that external amps are illegal. There are no consumer protections nor are there any recourse if the design is junk.

Of course I have but that doesn't mean much when today's amps are but copies and filtering doesn't reduce splatter, or being a dirty amp to begin with, there is a lot more to it than just the filtering.

Palomar was a good amp, I had a lot of them but I don't remember much of filtering done on them.

 

No offense but palomar is the bottom end of amps even texas stars are better but draw more amps sucks cause toshiba 2879 pills are the best thank you epa like you haven't screwed up this country enough.

 

Lord have mercy.
To dude 1969, hope you got a little insight as to your question. Over and out.

 

Just wondering, why do you consider Palomar the bottom end of amps? Because they run SD 1446's?

 

i agree the mosfets one are going to be easier to do tubes are way too expensive to fix in a amp

id rather buy a pal 250 fet amp and be done with it these amps dont come with filters anyway

too many people get their radio hacked by some guy that thinks he peaked your radio by clipping

audio limiters out then adding a swing kit.swing mod is fine but that plus a clipped amc pot sounds horrible