I finally found a resistor to match this one but geez 60 bucks? Any leads on a cheaper one?

You didn't screw down the transistors!! I haven't watched the whole video and hope you didn't blow those $$$ expensive parts. They need to contact your Copper heat spreader, with just the tiniest amount of thermal compound between the transistors and the Copper. And screwed down, but not too tight!!!

Timely video for this old guy! Is that quad a home brew?

Boehm Prairie

Alysson Square

should be 3000

McDermott Lodge

Shayna Key

Bergnaum Cliffs

Ettie Extension

Rick Shores

Wilfrid Cliffs

Zakary Turnpike

in your video, you said 'key it'. what exactly did you do? I do not see an rf in hooked up but you used a dummy load. how did you do this?

What is the lowest band that it will tune and how much power will it sustain on transmit?

Hi: I like your videos and the quality of your builds. What kind of material do you use for the transformer connections panel ? the one in the video is a red color fiber panel ? Where I can buy that material ? please advice. Thanks.

nice work! Did you try operating it at 75V?

I didn’t know the way to read the MFJ was to interpret X as inductive reactance and varying R as capacitive reactance. Thank you! Question: can it read capacitive reactance as a -j number in “advanced” mode?

Are these devices sourced from AliExpress or somewhere similar? I am asking as I do not see NXP on these. If yes, what's your experience with these suppliers? BTW, like your neat construction technique.73's

fabtastic

❤❤❤🎉🎉🎉

Very nice! Subscribed.

🌹🌹🌹🌹🌸🌸🌸🌸❤❤❤❤

Lindo trabalho, bem limpo a montagem, 73 PY1FI

❤❤❤❤🎉🎉🎉🎉

❤❤❤❤🎉🎉🎉🎉

schematic diagram... pls

ciao mi chiamo Gino IZ3QWE stavo cercando uno schema elettrico per costruire un amplificatore per le HF con una valvola 3cx3000a7 come quel bel video che vedo ,eventualmente ti mando la mia e mail Grazie

How much of that 2kW is lost through the filter in your HF amp?

Greetings! Where can I see the schematic diagram of this amplifier?

Now.... Why are the penta labs version like 1500 bucks a pc seems crazy high

Mike, I saw in your other video with the single ART2K that you saw 2kW at only 53V which I thought was impressive. Is the output of this dual 2K limited by the current output of your PSU or did you strap two supplies together and have you seen the magic 4kW?

Might be possible to have a wiring diagram of this interesting amplifier?

so nice

Good to see you making videos and working . 73’s

Thanks for the video on the filter- I have never seen one like that. 73

sorry for commenting 5 years after the post. I'm wondering if a threaded connection in a copper bar is considered reliable for fastening e.g. cable lugs. Reliable mechanically and electrically.

How many takes did this take? Lol

Are you running these on 55 volts? I’m curious of the power out and efficiency.

I did likewise with old Drake lpf and TinySA spectrum analyser.

what about microdrilling and tapping, i have to do 1mm dia tap

Nice build. W5DN

I looked at the posting date to see if it was April 1...

A nano vna would make your tuning even easier. The abity to see it directly on the smith chart and see if it's + or - johms and not just inductive reactance

Very Very Nice. So no need for the 3000 Meanwell power supply...? Your using the 1500-48 successfully and adjusting voltage to 50 vdc or leaving at 48vdc output?

..-. ..-

Congratulations on your project and thanks for sharing the information. I can't find the Tc - 18 coaxial cable, I could use the Tc-12 or the Tc - 25 instead, thanks

Congratulations, a job well done. I would like to know if the length of the coax T-12 and t-18 is critical ,or do you have a length to recommend? Thank you

Hi. I like your works very much. I am also a HF builder (homemade!!). I have a 2 x MRFX1k80H amp in the works. I can't find TC 24 cable. Can you help me with a source to buy this cable?? I do not want from the Chinese people!!! Good day!! YO8WTW, 73!!

Are you still doing any builds ?