Linear Amplifier, Part4, Tuning Drake L4B, Don't Jump to Conclusions, Jim W6LG YouTube Elmer

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This is part 4 of 4, tuning up for the first time using new Penta Labs 3-500zg with Jim Heath W6LG RU-vid Elmer. Jim gets about 1500 watts out of an old Drake L4B. Initially some failures inside the amp made it look like the tubes might be defective. As you may already know, the tubes were fine.n
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Part 1 of 4, Jim W6LG tells how he was almost electrocute in 1967 testing a homebrew linear amplifier. The point of the story is to be extremely careful when dealing with the voltages in a linear amplifier.
In Part 2 of 4, ordering replacement 3-500zg tubes for an old Drake L4B linear amplifier. Getting a matched pair that can deliver 1500 watts output with Jim Heath W6LG RU-vid Elmer.
In Part 3 of 4, replacing 3-500zg with new tubes in a Drake L4B Linear Amplifier. Jim Heath W6LG talks about the process.

Опубликовано:

25 сен 2024

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Комментарии : 23

@DonDegidio 17 часов назад

Hi Jim, Hope you are feeling better. You look good in the series of videos. I checked the date code on the Eimac tubes for my SB-221 being converted to a 220 and it is 7836. Stay safe. 73 WJ3U

@ham-radio 16 часов назад

They are amazing tubes. Blood tests today showed some problems. I will be going back to the hospital tomorrow for transfusion 27; I think that is the number. Not good as I cannot keep my RBC up. 73, Jim

@DK5ONV 14 часов назад

Hey Uncle Don, how are you doing? Have a great Weekend & 73 de Uncle Günter the Rhine River Maniac 💯🙋‍♂

@justinrayguitars6024 11 часов назад

Jim your knowledge is priceless! I have learned an incredible amount of watching you over the years. Thank you so much for taking the time to share these things with us.

@bobrunge7594 9 часов назад

Nice video. Got hit by a TV high voltage once. I’ll never forget it! If you don’t remember those learning times, you shouldn’t be messing where you shouldn’t be messing. Thanks for the great video, Jim 73’s Bob Runge W1LSZ

@kastaways1259 8 часов назад

How much less output does your L4B produce on 10 meters compared to 20 ? Mine seems to be about 300 watts less , do you consider that normal Jim ? Thanks for another video Jeff VE7GMX 73

@N8ESP 8 часов назад

The chain of events you described reminds me of nearly every project I engage in -- especially the ones that I feel should be "straightforward." 🤣 It's a completely natural flow in the troubleshooting process to focus on what changed recently. Problems arise, though, when one gets so locked-in to that thinking that other possibilities are missed. Really enjoyed this series. It's been a while since I worked with a tube amp, but this highlights just how rugged, well designed, and well made the Eimac 3-500Z tubes were. 40+ years of service at full legal power is impressive, to say the least!

@billalguire74 3 часа назад

Jim, thanks for sharing.

@DK5ONV 14 часов назад

You did an excellent Job, Elmer Jim! Keep well and tnx for the Video. Happy Weekend into Rocklin / CA & 73 de Your Friend Uncle Günter, the Rhine River Maniac 💯🙋‍♂

@JayN4GO 12 часов назад

Problems always come in 3s 😂

@bendeleted9155 19 часов назад

Jim, is this all stuff you could have gone down to MarVac to get, back in the day?

@ham-radio 16 часов назад

Yes you could back then. 73, Jim

@BigJoeMackie 19 часов назад

Well done! I am a Drake operator. I always wished for that amp. A pair of 3-500z! Outstanding. As for getting zapped, I touched a pin ball machine power supply, and had a similar experience.

@ham-radio 16 часов назад

It just takes not paying attention for a split second and you are dead. Good think I was not leaning in another direction. 73, Jim

@timothymaimone8611 19 часов назад

As an electronic technician many years ago, there is usually a “looped” circuit and the component that went bad was the weakest part in the loop. Those diodes were probably compromised and you replaced them. What other components are in the loop that is also compromised? Great visual on your repairs! Glad you broke it down to four short videos, as most techs would fall asleep after 15-20 minutes. 73 de KD6UYK (Tim).

@ham-radio 16 часов назад

I think I was at 43 minutes. I had too much to say. Those diodes had me frustrated for sure. I've ordered new diodes and will trash the old ones. I had no idea how old they are. Thanks, Jim W6LG

@kierinhortle1784 18 часов назад

Hi Jim, the capacitors attached to the gang tune or the choke may have a dry joint? the L/C circuit could be causing the extra load on the input circuit causing the resistor to go in the transformer trying to deliver more load than its rated for? { i have no idea actually} just a thought

@ham-radio 16 часов назад

If so that could bee dangerous. I do have spares from Russia that are big and in new condition. Thanks! 73, Jim

@Rubedo777 19 часов назад

Well I thought this was great to watch and listen to. I didn’t understand much of the electronic references but as a mechanical engineer found the build quality interesting. The “old” stuff always offers more “soul” to me rather than the tech today.73. 💙 G0uvl

@ham-radio 16 часов назад

It was well built but showing its age. It was designed for long transmit duty cycles with 2kW input power. I need to clean it somehow and soon. It is really dirty. I heated up the RG8X to where it was hot to the touch. 73, Jim W6LG

@Rubedo777 9 часов назад

@@ham-radio you’re amazing 🤩 Can you blow it out with a compressed gas canister… I get them from Costco but I think its butane??? That’s in them… WD40 cleans up dirty fascia and cabinet boxes.73. 💙 G0uvl