4x LDMOS Build Pt.1 

Way to go now I can tell my wife it’s a new style of furnace for the house. 😎

Bro NO WAY!!!! I saw this title in my notifications and i about jumped for joy. Im very excited to join along and watch the progress on this one. Your the man cale and thank you for bringing us somengreat footage and i hooe to learn some stuff here....im sure i will though because you hands down are the most informative none builder on youtube HANDS DOWN !!! AHHHH thank you broooo!!!!!!!!!!!

Your creating a monster bro! I like it.

Your getting recognition now, skullcracka mentioned you in his antenna video from 4 months ago

most broadcast transmitters use some kind of water Cooling. glad you point out that thermal compound is for testing only .not only does it go bad over time . i does migrate un into pill leads and transformers coils and tuning caps. That thermal compound is re active to RF and de tune the circuit over time. I had a few amps come threw that had gray thermal compound for CPU put under 2879 Etc. and the amp failed over time just because of thermal compound migrated and de tuned circuit . don't forget outher copoints around the pill will heat up as well and the combiners also. 73's

Looks like something that is going to evolutionize linear amplifiers, so that this continuous operation can be achieved by us all in the future. I am wondering how the phasing of the power supplies are going to have to be changed for continuous duty as well to be able to keep up with the voltages this is going to require them to have as well.

Not sure how much its going to matter but a better way to flow the water through the block is to center feed it and have the outlets on the sides. It balances the temperature across the heat source.

Wow, even though I got a good reputation distroying LDMOSes , I never tried more than one pill. Used BLF189 in my last touch screen project and is far more resilient than 188. Good luck and waiting next movies. Gabriel yo8rxp

Grate video! Got a question. Are you got to restic the out going flow of the heat sink a little to help with heat transfer... just thinking of my younger day of racing and pulling the thromostat out and having the engine over heat had to install a restricteor to slow the coolant throw the engine and ran much cooler...🤷‍♂️

Sharky I wonder if you could use a hot plate and just keep the copper right on that ..

good video

Sharky, with your water cooled design, I think you could use aluminum for the lower half with almost no change in efficiency. Those fins are great. Deep slots in copper, very impressed.

Invest in a temperature controlled hot plate to install the devices. Heck, even an electric griddle would be better than a blow torch.

Gate thershold voltage or Vgsth is temperature dependant, about -5mV/°C at such a low current, so the only way to know whether the threshold voltage has changed or not, is by keeping the device temperature exactly the same before and after. The LDMOS might have been a bit hotter after soldering, hence lower Vgsth, which does not mean the soldering altered it. Nice watercooler block, however the 1st half will always run colder than the second half, not sure by how much.

i run my amp with 2290's at about 75% output with a overkill cooling fan and for 15 minutes or better. been using same amp for over 10 years. i am a firm believer in running my amps at 75 % or less. think of your car. it can probably run over 100 mph but for how long? if its a radio drive 4 watt amp try running it with 2 watt deadkey but not going over 4 watts. same with multi pill amps that you drive with a smaller amp.

Are all these LDMOS amp. U do just for CB or will they work on ham bands

One word 'Hotplate'

Great Job, Cale!

superb!! 73's from israel

It appears you're not using a grounded workstation or taking any anti-static precautions at all. You can injure those devices... and you're asking for premature failures.

Hey which mrf is that? Is it the one they have at fatboy ?

Hi, first let me say then you are doing a great job. Me and one of my friend are looking to built a ldmos amplifier but we need your help with the cooling so Is it possible for you to sale us few waterblock for our cooling system. We are amateur radio operator in Quebec and ready to pay for this waterblock. Thanks! André VA2WR

Everything goes better with Coke Lol

Ask your builder if your amp is legal or if you might lose your home paying fines or in some country go to prison.

Can you build me one ?