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I read your intro. At the end : what is a TOF please ? By using Google translation some terms are weird. When you Say " Dipping the plate" do you mean, as I was told " you must look for maximum HF in the "hollow" plate current"? I did that with my FT-102. I see on the "user manual", on 40M, the load must be around 3 or 4 ( I have not the manual, I write from m'y memory). On my Al-811, the load is on 1 and below. If I go on 3 or 4, the HF power goes down. I also read something like : a little number for load is bad for intermal parts of the AL. ( Why ? ) I ran out of the barn yesterday the AL. I didn't use it at least since 20 years. I opened it to check if something , like capacitors... , was wrong. I use an extend to feed the 230v, to have enough distance in case of😊... All was ok Sorry about my poor english, I hope you can understand it.

Max gain has awesome connectors. You can put a torch to them and they will not melt. I know for a fact because I tried it. I have a video of it.

Is this 100 wat drive with all 811h models

Should I just simply remove the MOV’s? Just clip them? They don’t need replaced with anything else?

Such an intuitive understanding of RF, national treasure for sure.

Tom is it possible to obtain those graphs you presented on line

After having taught soldering techniques in the USAF a lifetime ago, this factory soldering looks pretty sad. Once you have soldered enough connections your flow (pun intended) should be pretty smooth.

Sure looks like bad QC department..obviously no trained QC folks. The QA department sorta let loose a horrible production scheme.

Is there 1 thermistor or 4?

Thanks! My grid current looked strange. Reading high. Did a check, as you described, and the grid current moved. Replaced it (the diode I removed was shorted), and its working properly now.

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Tom, I have not gotten anymore RUclips notices of upcoming videos from your channel. Now that MFJ has ceased production your videos are more important than ever. Unless someone else is taking over MFJ it looks like DIY is another way to go if parts hold out. Hope to hear from you. Dan

Hi Tom - How do I purchase the "board you have that will fix this ?" Thanks for sharing your knowledge with us ! BTW - your troubleshooting tips for the AL-572 were very helpful converting mine to GI-7b's.

Great video, learned a lot! I'm still classified as a "newbie" to electronics, but it's videos like these that go a long ways in teaching the skills needed for ham radio operations. Thank you Tom!!!

what should be the setting of the loading capacitor during the passive test ? should both plate tune and loading be varied first until maximum feedthrough is obtained ?

Thanks for the video, what is the torque for the FET screws?

Thank you for clearing up so much of my confusion with tuning my LA! I was intimidated by it and always worried about damaging the tubes. Your clear explanation has saved me a lot of worry!

Some of us still like to play with AM. What can we do?

whats next best if you dont have a tuning pulser

I found your video while researching an issue I'm having with a new ALS-500M. Powered by the Ameritron SPS-75MV, its meter registers nothing at any power setting, on any band, when the IC-7300 is keyed, even though the ALS relay clicks clearly. Any ideas? I would be most grateful.

Thanks Tom. Is tuning a Tetrode tube amplifier done the same way?

Effective demonstration. I always doubted those flaps of metal in the tank but seeing is believing.

Was the TOF always in the AL-80B? I had one about 14 years ago, but only for about a year, and I don't recall ever seeing a red light come on. But having owned two AL80-A's if many years, I always kept an eye on the grid current when tuning and stopped before hitting max. I pulsed mine with the CW keyer for tuning. 73 DJ0IP

I can't not express how much knowledge I've learned from you over the years, sir. Nor can I thank you enough for the patience in which you teach, especially with "dummies" like me, or "newbies". 73 DE N4ZAW

Was a big help & I’ve been doing this over 30 years. Much easier.

Thank you, Tom. K7KDX

The Idiots with MFJ did not ship fuses & fuse covers........

Tom, what would prevent me from getting Grid current above 40mA on my 20Meter range please? My 40m will get >150ma Grid & >450plate? Thanks great video. So many other videos talk of peaking plate & not grid. Any help would be greatly appreciated

My Amp is 25 years old. I have no clue how long both of my needles have been moving in unison! My output has dropped to just almost 400 watts and I thought it was just weak tubes ( probably still is) but I have ordered a 1N4007. Thanks for the insight.

Do people add copper heat spreaders?

Honestly, I went from not having a clue on how to set up a tube amplifier to completely understanding from this video. Amazing presentation and perfect layman explanation, thank you.

Gosh, you are a great orator and teacher. Just a tinkerer and I have seen the ameritron issues in my own stuff but great descriptive video.

What was that flashing red inside the amp? And was that some sort of reset with the stand by switch? thanks

Tom, I just want to thank you for this video! Dang, the manuals and other well-intentioned hams would have new-to-amp folks like me thinking that proper turning is some kind of esoteric activity. You have simplified it quite a bit. Question: I have an 811H that I picked up used and will be installing a new set of 572B tubes. What mA value am I shooting for with the 572's? Thanks for your videos. They are very helpful. Sub'd.

My 606 was also shorted. QAed by "KA" on 10/17. Thanks Tom!

How do I tell if the filter cap. board is the better board on the AL-1500?

If I follow the procedure in the video works flawlessly and I get the 800 watts (happy about that) but then when I’m reading the manual it says about never exceed 80 watts so that confuses me because I want to treat well the amp but with 80 watts I don’t get more than 550watts. So do I trust the manual that should be the gospel or this video?

Will 5 watts output (lowest setting I can get) cause the grid current meter to move during this test?

Hi so you have the board available for sale ???how can I get in touch with you ?

Tom, I always tune my 811H into a dummy load. Should I be using my radio like you are? You have the best presentations on amplifiers! Hank

Thank You so much Tom!!

Thank you Tom and 73’s.

Once the amp is tuned using this method, can the output of the radio be lowered to give the desired output from the amp?

I have one that i convert to GI7B tubes but i would like to ask you about the transformer, do you use the stock one or something different? I can't decide if i will use a bigger external power supply or the stock transformer. Thanks, Chris

Thanks Tom. I am having trouble finding a video of how to install the mfj gop-100 on my al-811h.

I have a AL-811 Ameritron amp. For some reason, it started blowing fuses. I have 20-amp fuses in it and it runs on 120 vac. I just put 3 new tubes in it today. It tuned up ok and had a idle plate current at 60 ma like it supposed to have. Everything seemed ok and I made one short contact and after setting there for a few minutes it blew both 20 amp fuses. I wasn't even keying the mic or anything. Looks like I changed the tubes for nothing. Any ideas?.

Terrible, just terrible. If my soldering at work looked like that, I wouldn't have a job.

Why is Ameritron not addressing these mods themselves !

Thanks Tom for uploading this very informative video. I don't have an AL-811H, but some of the content is applicable to my amp. I have the following thoughts after watching it: 1) How is the 200 ohm value of the resistor that is added to work with the neutralizing transformer determined? (E.g., if one desires to have less effect on gain, would a lower resistance such as 100 ohms be appropriate?) 2) For some of us, a quick pictorial to illustrate the suggested circuit modification (such as the insertion of the 200 ohm resistor mentioned above) would be useful during the explanation of each modification. 3) Good point about the potential problem with loose/overlapping windings on the plate choke. The next time I have my amp open for maintenance, I plan to check the security of my plate choke windings.

I have been afraid of a tube amp due to this issue with the tuning. But at the price point per watt it makes sense to get the tube type. A solid state is ok but then they get you with the power supply and screw that. Not paying another grand for a power supply. Thanks for the good info