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i nned to ask have you done any grid driven box with 4cx800 / gu74b tubes

THIS VIDEO IS FOR WIRE ANTENNA and IS NOT FOR COAX...or this is my mistake?

Great video if you want to make 1/4 or 1/2 wave elements for vertical arrays. Even easier than nanoVna. Remember to leave a little long for connector installation trimming. I try to measure the normal trimming of your PL259 solder connections and compensate for that as the last trim. Make a log of your trim lengths and how much it effected Freq. so you know what to make the last trim. K6RAD

How much $

I will be purchasing one of these in the next month or soo. Very clean layout. Can you led the meters?

I just found your channel and see you are using the GI-7B. Have you ever built a four or five tune GI-7-B amplifier?

Don't "solder" coax with a foam dielectric. Use a clamp or crimp style connector. If you solder the shield, you will melt the foam and the coax is no longer "50 ohms" by design.

Unless your RG-213 is using PTFE for a Dielectric, the V.F. isn't 69.5. If it is "normal" RG-213 and uses Nylon as a dielectric, it's V.F is 66%.

Yeah Guys, quit sweating the petty stuff, start petting the sweaty stuff!!!...🇺🇸🤠👍

Good thumbnail gain rating for the tube, roughly 10dB, and a touch more depending. I run a Henry 2KD Classic which is 2 3-500Z tubes in grounded grid and i get about 10dB. Closer to 11 or 12dB depending as i run it all over HF. But since an S unit is 6dB that extra 1 or 2 dB doesn't mean diddley in the real world.

High drive amp people......................................

Why you don't use rms to start, than go to pep 🤔

Does the GI 7B work on 11 meters?

PA0FRI gives superb 'tube re-activation' guidelines. HT isn't really needed. It's all about Preparing the tube for the HT by restoring a good vacuum. Stick the heater on for a while, like a few hours or a day. Cooling is Required ! Inside the tube there is a 'getter' chemical that Only works when it gets hot. Barium was often used, so avoid smashing old tubes and breathing the stuff (toxic). Typically the chemical is a solid next to (or on) the heater. Some tubes have it near the anode. When Hot, this chemical reacts with the few molecules of air left inside tube, converting them to Solids, which sucks the vacuum down harder. To test if it's working, short all the grids to the Anode and apply about 15V dc between anode and cathode. This makes the tube (any tube) a Diode. Watch the Current flowing - it will increase as the vacuum inside the tube gets back to a functioning level. Care must be taken to make sure the current does not exceed the tube/valve's maximum rating, which it Will if it works as a diode and the juice is available, even at 15V.

Do you have any of these left? Is it $1000 plus shipping? I’m interested. Thank you.

Very Nice piece of equipment! ~73s

Yeah, but how many watts does it do? 11111111111 auuuuuuuuuudioooooooo

Very cool 😎 73

Very nice! Out of curiosity how did you learn to build amplifiers, formal instruction, mentor?

Very nice work 👍

That is really slick my man . I would like to have a tube tester for the 3-500Z

Good evening, my dear friend, and I wish you success and prosperity Thank you for the wonderful and beautiful participation, and I wish you eternal happiness, God willing

There is merit to this. What about a multiband compromise say 10=-40 meters?

Isn’t this illegal?

You never say what bands this works for. Is it an 11m CB amplifier?

In my dreams...

What band is this tuned for?

Nice!. Thanks for sharing that with us.

Great looking amp!

Thanks for the simple explanation. Your method works great. I usually talk on some lower frequencies below 11m channel 1 so I implemented your advice when I made my next jumper but made it a little over 6' (6'-5") and it came out perfectly, in fact I was able to cover the entire 11m band up to 27.425 down below 26.865 and my SWR never went above 1:1.2. During my years in the radio game some have told me it doesn't matter and others have said differently but now I know it does. Thanks again, I'm off to make a few more jumpers.

Like to see the inside of amps more than the outside.

Very Nice 👍

I would love to see a video on a 4 tube build

Ac Sky Is The Best .Nothing Like it

Very nice!

I would love to have a 4 tuber ⚡️💥

thats a nice one..can you do a 3 tube in 1 unit or that has to be 2? I have a peter dahl 1.75 amp ccs xformer kicking around from my amp supply lk550.

Конденсатор разделительной made in USSR

Why would you want the coax resonant? It then tends to radiate making the coax part of the antenna Coax resonance is a bad thing

Seems he is tuning up with his exciter set on AM not SSB or CW?

Whats the price shipped to California?

ya build some nice stuff sir! 419 in boston got downnnnn!

Blessed love my brother, Great video as usual bro, how much does a box like this cost, can a single 3-500Z pre drive a box with 4, 3-500Z tube, and how much will the final wattage be, watching from Jamaica west Indies !!

Blessed love my brother, Great video as usual bro, I have learn a lot from you, is there a higher wattage tube than the 500Z you can use in a box to use with my cb radio on 11 meter AM, and LSB, watching from Jamaica west Indies !!.

Blessed love my brother, Great video as usual bro, how much does a box like this cost, wat do you recommend to drive a tube box like this, a transistor, or a tube amp, watching from Jamaica west Indies !!.

You do great work nice clean and thorough if I wasn't so far away from you I would have bought a box from you

Its A SIN That You Did Not Open It Up And Did Not Show Us ;D