Palomar 450 FET

[Mudfoot]

What's the verdict on this amp. My research shows it's been around, but DNJ acts like it's new one the scene.

Just wondering for now.

http://www.dnjradio.com//product_info.php?products_id=49

 

[TIN_CAN]

I hade a LD model for about a year...it was a good liitle amp would see 500 watts out of it driven by my HR2510, gotta run a fan on them as they do get warm.

 

[fnkycoldmedina]

i believe it is newer being that it has the 7530`s in it .previous palomar fet amps did not use this transistor.
we start to see alot of this fet being used now .

 

[TIN_CAN]

i believe it is newer being that it has the 7530`s in it .previous palomar fet amps did not use this transistor.
we start to see alot of this fet being used now .

What was in them before? as mine is over a year old and has the 7530's in it.

 

[Mudfoot]

This thing is supposed to digest 80 watts or so.

 

[9C1Driver]

Hey there M42duster, I notice X-Force has expanded their mosfet line as well.

Mosfets

 

[Mudfoot]

Might have to experiment with them next. Are they decently biased?

Thanks!

 

[Watergate]

Hey there M42duster, I notice X-Force has expanded their mosfet line as well.

Mosfets

Aren't they biased class B?

 

[Mudfoot]

Aren't they biased class B?

That's what I always thought. I was wondering if their expanded line included proper biasing. Can't remember if you can order one custom or not.

 

[9C1Driver]

Aren't they biased class B?

I am not sure. I know the TnT line is class B and the Midnight Special's are class C. If they were B or AB with a switched delay that would be super.

 

[ExitThirteen]

The bi-polar transistor versions of their amps can be biased class B upon request. But it's not worth it. If you plan on running SSB, class B isn't enough biasing. That's why I re-biased my 2x4 X-Force base amp to class AB. I'm not real sure on their mosfet amps tho if they kept it the same as bi-polar transistor versions. Be interesting to find out if they do.


~Cheers~

 

[Mudfoot]

That's why I'm a little Leary of this 450 FET. I'm wondering if its only B biased.

Find out next week when I pull the top off. I emailed DNJ, and they flat out said it's AB1 with a tuned input.

 

[Mudfoot]

Got the amp today (450 HD FET) and hooked it up to the trusty little Optima.

SSB sounds like SHIT. Input SWR is 2.5:1.

Supposed to be a tuned input and AB1 amp.

I can't open the case to take pics and gander yet because of warranty. Dunno what their posture will be yet.

 

[Mudfoot]

8 foot jumper, lol.

 

[Robb]

Got the amp today (450 HD FET) and hooked it up to the trusty little Optima.

SSB sounds like SHIT. Input SWR is 2.5:1.

Supposed to be a tuned input and AB1 amp.

I can't open the case to take pics and gander yet because of warranty. Dunno what their posture will be yet.

Man, you sure do have poor fortune when it comes to equipment. Sorry to hear about that. Thought I had it tough.

The two local ops I know that have/use this amp didn't have any problems that didn't get sorted out. The problems one had is that he didn't use a big enough supply. He also had the ALC in the radio up too high. Maybe that can help you.

These MOSFET amps will draw a lot more than 40-50 amps as that sheet said. No way 40 amps. On peaks, it will likely draw closer to 60 or even possibly 70 amps. We are talking about MOSFETs and amp efficiency here @ the 500w mark.

You might try the Low Pass filter BETWEEN the amp and radio as an experiment to see if the radio is giving off some harmonics in the amp. I would. If so; then the ALC adjustment would be my first guess for the cause. If all else fails send it back to the seller; I would.