Linear Amplifier, Part 2, Penta Labs, Ordering 3-500zg Tubes, Drake L4B Linear Amplifier, Jim W6LG

[@robertmeyer4744]

Great Jim. Going threw the data sheet. Yes Grid current ! Also as tube reaches end of life that grid current will rise . Great stuff so far 73

[@ham-radio]

Yes, good point, it will rise as the tube becomes less effiicient and requires more drive. Those old Eimac tubes that I had in the amp were pretty damn good for 47 years old. I am sorry that I broke one of them. I did not notice the fan was stuck. 73, Jim

[@stevehildreth1934]

Picked up an old Henry 2-3K with 3-500Z tubes. Haven't had the chance to check it out yet.

[@amateurshooter6054]

Thanks Jim

[@ham-radio]

Thanks for all the nice comments. Going to Kaiser for a transfusion on an emerency basis today. 73, Jim

[@Sneaky-Sneaky]

I have had pretty good experience with the Henry Greenstone 3-500 tubes from China. They test them as they come into stock. They are $229 a piece and you can get matched pairs…..

[@ham-radio]

Nice. If you have a link please post it. 73, Jim

[@timgoad5750]

Excellent video.

[@ham-radio]

Thank you very much!

[@Michael-DE-VO1OP]

Hi Jim: I'm Michael DE VO1OP from Newfoundland Canada and I was wondering if you could do a video on the plate dissipation of a 3-500Z VS SSB, CW and digital operation? As the 3-500Z has a plate dissipation of 500W but if you tune it to the max allowable plate current and grid current levels, your pushing well over a KW. I think these numbers can be very confusing. Thanks and 73: Michael DE VO1OP

[@bendeleted9155]

I don't remember one question in the technician or general pool that covered these hazards.

[@ham-radio]

Excellent point, truly excellent, they don't cover stuff that is so important. The questions on the currrent extra class are ridiculous. Thanks, Jim