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Driving with 75 watts? I have 811A tubes in my AL-811H amplifier. When I tune I use 20 watts to start and my grid is a t 50ma and the plate is around 100 ma. Once tuned the max I ever drive with is 35 watts. My plate is 450ma and my grid current is around 100ma and my out put meter reads 600 to 800 watts depending on Band. seems like he was driving with a lot of power.

looks like that maybe not a stock amp. I see the resistor mod right on the first tube. I could be wrong.

That lamp looks like its from this side of the pond. ;-)

I would say the 811As were no good. I get 400 to 500WATTS with 40watts drive from my 811As it shows 500 on mfj 962d and 400watts on Revex W500

Thank you.

Tom, did you have to do anything with the 572B tubes or were they just plug and play?

60 watts input is the most I ever put into mine. Don't forget to fine tune each band coil on the rear of the amp for whatever your favorite frequency is. I use a Bird and Daiwa large face meter to see exact results.

i did rebuild my 811 to 4th tubes so gives now 600watt pure out.. But to place 572b ?? No way i would do that

waiste of time and money. Voltages are -+1500volts so 572b never comes to full potential. I have SB200 and with 2 tubes gives 600watt with no sweat.. If you want more power just buy better and bigger amp bro. Your transformer is weak for those tubes.. You will kill transfo bro. There is no cheap breakfast in 5star hotel oor cheap whore that you want need docter after.. 7'3 and stop doing bs PLEASE

diference between 800w and 1000watt is only in head 😅😅👍

Gezzzzz man, NEVER stick your hands in something like that with a ring on.....I lost a good friend that way

What line voltage, 120 or 240 volts?

A total waste of time and money. 572 has the same curve as an 811 except the voltage goes higher. Multiplication Factor of 811 is 160, 572 is 170. You have to increase the plate 1000 volts and pay more per tube for what? An extra 150 watts? And at what frequency? I rebuilt a Gonset 101 with a better HV supply and get more out of 811A without stressing the tubes.

These amps should never be driven at 75 watts or more. You're overdriving the tubes. Max power out on cw is 400 watts for the AL-811.

Hello, I am KC4ZZE, This is what Ham radio is about, sharing experiences and knowledge to advance the art. I needed a way to rotate the hexbeam remotely 200 miles away from the shack using a RCA VH226E antenna rotator. I came up with a solution after giving it a lot of thought. I purchased a WIFI IR hub and manually programmed the hub training it with the VH226E’s RCA handheld remote control as an experiment. It worked! I can now rotate the hexbeam from my cell phone turning it North, East, West, and South controlling the VH226E Antenna Rotator from my android cell phone using the Tuya App. The IR hub is freely supported by the Tuya app. I watch from two remote cameras to see the inside rotator box and outside antenna rotator operate and turn as I use the Tuya app. The AC power to the inside RCA VH226E box is a manual switch on the side of the box. I set the switch to permanent on position and plugged into a Kasa AC outlet. Now I can rotate my antenna from any where in the world with WIFI connection.

are the tetrode pins on the 572Bs keyed? how are you making sure they are correctly inserted?

You're the only channel to show taking the tubes out and putting new ones in. Thank you N7ECV

So it's now Oct 2022. How's it working for you now ? I'm interested to know if it has held up for you over these last several years. How did you bleed off your voltage before doing that work? You didnt show that part .

Amerijunk, burn it up OM

That must be a newer amp than mine. Yours does look like they put the W8JI mod in it to prevent occilations. Looks like the resistor and capacitor on the floor of the amp next to the last tube. Mine an 1985 vintage 811 amp has the American made RCA's tubes with fins. I get 400 watts with 36 watts drive at around 300 plate and 140 grid. You are limited by the power capability of the transformer. You could burn up the transformef if you push it too hard! I would love to have 572b tubes in mine. But a new set of tubes wuold be more than i payed for the amp used. I have thought about putting some Chia 572b's in it but even then quite expensive. I love my 811 amp. I also agree on the power meter i have a MFJ Versa Tuner V and i think the meter is generous.

Great video, thanks, W5SRT.

I had the 811H for about 10 years and I tried one set of 572B tubes and it was a Waste of Money. They ran cooler than the 811 tubes but they produced No output power difference and they cost over twice as much as the 811 tubes. It was a very Poor investment.It’s not the tubes that will increase the output power unless you modify other components.The power supply is only good for so much so the best thing you can do is Upgrade to a larger output amplifier.I went to an ICOM PW-1 and sold the 811H though it had been a very dependable amplifier.I don’t regret the change because I love the extra output power on HF & 6 meters. Ameritron sells the 811H with 572B tubes and it’s rated for 800 watts just like the 811 version.

KYJ 9811 THE BALTIMORE BEAKEN

Is there anything that goes into the rotator itself to turn like a cord connected to the digital box inside the home or do you put batteries in the rotator itself? thanks

Bought the RCA VH226E Outdoor Rotator with Remote Dec. 2020. Lasted until we had strong (but not too unusual) winds from a thunderstorm. Stripped the gears of this rotator. If you will check on Amazon, that has happened to many folks that have purchased that and the RCA VH226F rotators. Those are typical cheap, Chinese made with poorly designed rotators with plastic gears. All other rotators that I have found are much more expensive - all made by Yaesu. Those too may be Chinese, but I strongly suspect that they are made of better stuff.

Ive seen these amplifiers with good 811 tubes with only 40 to 50 watts drive power easily produce 600 watts output from 160-15 meters and 550 watts output on 10 meters.

if the Ht voltage is 1700v like 811a's require an 572B can never equal the power of the 811a at that set voltage... the 572B is more rugged and powerfull at 2400v HT. after each RF increase you need to dip the amp again. maybe the 811a\s were (soft) but i reckon they would have easily topped 600watt if dipped correctly, as i have never had them go weak, ratrher they go poof! if driven to hard due to heat failure of the anode shorting out on the grids (metal gas flakes of(redhot). so if you were to use the 572B's they will last forever as they will be used 60% of there capability running 1700v HT and not 2400v as they were intended. just my 5cents.. we all do as we please :)

Azle is very haunted by demons, over ran with methamphetamine, cops are terrible do nothing good old boy mentality and if you have problems with the methheads prowling your property at night, remember it's cats, deer, bag worms anything except the truth. Azle and Springtown have the same problems. No shopping of any kind, ok Walmart, which is picked over all the stores in the area are that way. Only dollar stores around this area. It's not going to change, real-estate agents will tell you different to sell you a home. People move in and quickly move out!!! This area is slow slow growth near to non existence. Death on 199 and other hwys and back roads very common. Dangerous area for teens. People can't drive here they drive 50 in left lane get their feeling hurt bc you are behind them. Helicopter rides are common, but it might be your last ride, so enjoy.

Thank you !

Man it’s a miracle you didn’t get lit up! Never ever trust a bleeder resistor to discharge the caps! Please all those you do this make sure to bleed off the HV caps before getting into the HV section of any piece of equipment. It can be fatal!

hai thomas is it work for yagi 2x12 element

At least your MFJ watt meter is a valid point of reference for your experiment.

Hallo Thomas does this unit work with EU 220V?

A shit hole

And you made a video for this?

first thing i saw was the ring on the finger. couldn't watch after that

You need way more plate voltage at the same current to get those 572b tubes to honk. I'd recommend you not drive them with more than 50 or 60 watts, but others will surely disagree with everything I stated. ;)

Regarding cost, would it be better to buy the correct model or upgrade? Thanks.

I really miss being able to go down to Radio Shack when I needed a 5 or 10 foot mast for an antenna. They were reasonably priced and always had them in stock. Now, it's hard to find a mast anywhere. Home depot and other places seem to have discontinued handling them, No wonder you had to use a shovel handle! When I do find a mast for sale, they're selling at about three times what Radio shack charged!

Does this rotor have a brake to keep it from rotation when it’s not activated?

7.5# or slightly less depending on sources. Ive seen it reported as 9 and 25# believe it or not. But consensus is 7.5#. No thanks to RCA for their lack of specifications.

1st thing I SAW WRONG was the ring and watch..........

Go hornets

I’m from azle. I grew up there. Went to high school there. Azle is unique.

Drove the snot out of the 572bs to show what you you can get out of it. Shoulda bought the 811h will do 800watts with the stock tubes 572bs are more forgetful tube hearty mainly.

It only gave you one s unit

hey Thomas how is the rotor holding up with the mfj-1886 loop on it .....i am doing the same thing here with a mfj-1886 loop and that rotor

I recommend changing the power cord to a 12/3 or 10/3 power cord. Then put the bigger caps in it. The power cord they send them with are 16/3 which is not big enough to power a lamp much less a 811 3 tube amp.

I put up a 45' tower and figured I would include this RCA model rotator. It always rocked back and forth a little from the gear spacing. I used it twice to tweak reception and never use it again for 3 years. The rocking finally stripped the gears and it free wheeled with the wind. I dropped the tower and pointed my antenna 38 degrees to Chicago where all my channels but 1 come from 48 miles distance. It was an experience dropping the hinged tower for the first time all by myself and I hope the last. I get 1 PBS channel from Gary, Indiana. All my channels come in at 72 on my LG TV signal test. I know I need at least a 40 to receive a station from past test. I cut the cable years ago.

So how has the Rotator held up? It looks suspiciously like my Radio Shack