Thinking CarlBuilt 400HD for AT6666 combo

[CB590]

Here is the SWR on lowest 3/4w dk power with amp on.

Here it is with higher 7-8w dk and amp on. Shows as 1.9:1 on the radio display. I still get about 50-60w I'd swing on PEP mode. To like 475-500w.

Starts at the 175w dk and swings to like 350w pep with the 3/4w dk.

 

[2NC995]

What’s the plan for now, CB? I think I’d be a bit uncomfortable running HGs at those SWR levels.

Do you think the amplifier is generating harmonics that give the higher reading?

 

[CB590]

What’s the plan for now, CB? I think I’d be a bit uncomfortable running HGs at those SWR levels.

Do you think the amplifier is generating harmonics that give the higher reading?

From what I can see thru messenger Carl hasn't been online in like 2 days. As my last messages are not even received yet. So I hope he is well.

Probably stick with SSB with it for now. Or run the 296 with it if I decide to do AM mode. Like you said I don't like the high SWR either. Still waiting on RadioWorldUK t send me my Sirio 2016 missing parts so I can get that up and hope it cuts my SWR issues and high qrm issues too.

 

[groundwire]

I dont know if someone said it yet but you need to put it on a dummy load and then look at the numbers. It will help rule out any variables.

 

[CB590]

I dont know if someone said it yet but you need to put it on a dummy load and then look at the numbers. It will help rule out any variables.

I need to find a nice high load. I currently have none and have to buy car/truck tomorrow as my trucks been in shop a month and I'm done with the shop. After that gets squared and I get funds I will check out getting one. Need a 300w one at the minimum. I know my A99 has had issues when the wattage goes up. Thinking it just sucks with high power.

 

[2NC995]

I use a 1kw MFJ and even the DX500 heats it up pretty quick. Of course I’m a cheapskate so it has peanut oil in it. Lol.

 

[S&W357]

Use that same peanut oil for deep frying turkey?

You could drop some chicken wings in the can and key the mic a few times. Hold the key down and say “Audio Audio Audio“ numerous times and wings be ready for some hot sauce.

 

[2NC995]

Use that same peanut oil for deep frying turkey?

You could drop some chicken wings in the can and key the mic a few times. Hold the key down and say “Audio Audio Audio“ numerous times and wings be ready for some hot sauce.

I usually just put them on the exhaust manifold, but it so happens I do prefer fried over baked...!

 

[Handy Andy]

Well, by meter alone, if you're running Class C, that would be about right - low Dead keys, if you think of it this way, are low volume signals arriving into a stage - the amplifier is just sitting idle - so there's noise in all of that (the THD IMD stuff) - so as you improve the signal transfer into the amplifier, the waves it can generate have less IMD but the THD stuff will always be there.

The Class AB stuff - the better the bias that is there - the better the signal transfer into the amp (I'm referring to the admittance) so as I can see, the AB bias kinda "Washes" out the low-level signal but as you swing power into the amp stages, it gets cleaner because it "sees" a more accurate signal to amplify.

So do you do fish, or poultry?

 

[snippits75]

Did you ever find out what was going on with the AM side of the amp?

 

[CB590]

Did you ever find out what was going on with the AM side of the amp?

Carl has been off FB for about 2 weeks. Hope he is ok. Nothing yet. Could just be my A99. Never liked power. Still waiting on my Sirio 2016 parts.

 

[snippits75]

Well, I hope it works out OK in the end.

Do you know if the amp has the HG 2SC2879 C transistors? Or does it have the lower power output HG 2SC2879's? Link below from Carl's website.

https://carlbuilt.net/shop/ols/products/hg-2sc2879-c

 

[CB590]

I have the regular HG2879 model not the C model. Was like $349 and $60 for AB bias.

 

[Highway Man]

Any new news on Carl?
Beginning to worry here

 

[CB590]

Any new news on Carl?
Beginning to worry here

appears to not have been on FB messenger since June 5 or so. I've got unseen msg since June 8th. Hope he is ok.

You can always try to call him. His # is in his videos and I think on his page.