11/7/2022 0 Comments Homebrew amplifier plans![]() The height of the filter capacitor will not allow everything to be at one level. This will have to be on two levels with one side being lower to accommodate the tall 100 uF 2500 volt filter capacitor and the other side raised enough to allow a fan to be mounted underneath the tube enclosure. I first have to build a sub-chassis that will be attached to the front panel and be able to be slid out of the cabinet. Homebrew amplifier plans install#Three, not including a regulated screen supply will allow me to install everything including the power supply into the one single case depicted above allowing for a complete self contained amplifier. Two, I do not need low drive requirements as a grid driven amp would have as I have 100 watts available to me from the exciter. ![]() One, it is a simpler design not requiring a regulated screen supply. I have decided to go with the pair of 4CX250B's in a grounded grid circuit for a couple reasons. ![]() He is pretty much back to normal now and things are going well so with that behind me I want to let you all know that this project will be starting right away. At one point he was on a ventalator in the ICU so my mind nor heart was into anything radio related. The last year has been rough dealing with some issues my father had after contracting a nasty infection following surgery that necessitated a couple dozen trips to the city hospital over the last year to see various specialists. Unfortunately I was not able to start it when I had hoped due to some things going on in my life that required my attention to family business but things are on the upswing now. Well the project is finally going to go ahead. ![]() I need to recheck their ratings first.Either way they look cool. I may use them or just leave them in for looks. The two transformers in the middle are for the screen supply if I use it (with red plate) and bias (smallest of the two).I figure I may as well build a supply with the ability to run tetrodes and then I'll figure what I will do with the amp later that way all the work is already done.The chassis has two breakers already installed as seen below the two pilot lamps. I only need one of them but I may as well mount the other as this supply may be used in the future with other projects.The lower left is occupied by the Sprague 2500 volt 100uF filter capacitor for the high voltage. The two smaller gray transformers on the right are identical Hammond filament transformers at 10 pounds EACH. They are the largest of the transformers seen here and weigh in at 30 pounds EACH. There are two identical Hammond plate transformers to be wired in series. That will actually make them right side up and the terminals will protrude down through holes in the chassis and the transformers will be bolted from the underside. The four large gray transformers will be mounted upside down from what is seen in the photo. Enough of the depressing stuff and on to the fun stuff.īelow is the chassis with the major components in place. I got a hell of a deal on it, too good to pass up really, but anything right now is too much. There goes a bunch more of my tower and amp money. The fridge has started acting up so the day was spent shopping for a new one. The power supply will be built on a separate chassis and will be a floor model power supply.I didn't get any work done on it today other than parts placement and photos. Yesterday I decided to venture into the deep dark recesses of the basement and start digging out the stuff to build the power supply for the amp. ![]() Besides the tubes I also have a pair of Eimac SK-620 air system sockets and SK-626 ceramic chimneys I picked up at a hamfest years ago for the ridiculous price of $10.00 for the two sockets and two chimneys. I have had a used pair of Eimac 4CX250B tubes for several years as well as a new pair of Eimacs, still in the boxes and figured it was about time to do something with them.I have plans in the future for an HF amp so I decided that this one would be built for 6m. Well I finally decided to build an amp for a winter project. ![]()
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