The AM Forum

I am starting to build a small 100 watt class am rig using two 3C24 triode tubes. The tube has the plate on top and the grid on the side.

Trying to figure the best way to locate them side by side. I would guess taking the plate parasitic suppressors of the top in one direction, and the grid suppressors at 180 degrees.

Never seen a photo of a rig with these tubes.

Thanks

Pat
N4LTA

the 1947 Editors & Engineers handbook shows amps with 35TG and HK-54 tubes, the pics don't photograph well but they show the tubes seated deep in the chassis with, what I figure, less than a quarter of the tube base protruding above it.

Hi Pat,

How did this 3C24 project work out?   How's the other projects going in the rebuilt house?   I used to have a 24G modulated by a pair, so interested.

T

I have the parts to build this but will wait till my shop is complete it. I have the modulator complete. The RF deck is a little more than I want to attempt in the apartment. I am working on a HV bench power supply now in the apartment to keep me busy.

We hope to move back in in 2 weeks or so but it will be another 4 weeks after that  to complete the lab and shop. It is all in the dry now. starting to get the conduit for antenna coax routed in the walls and get existing coax into the lab area this week.

The house has been totally repainted and the floors refinished with new carpet upstairs.  Only the den and back hall and restroom are unfinished and they have just been put in the dry. Those areas as well as the shop and garage need to be totally refinished. We are getting there.

Pat
N4LTA

Keep us posted with pics, Pat.   I always enjoy seeing homebrew tube rigs, especially plate modulated stuff big and small.

GL on the house repairs. It always ends up better than the original in the end.

T

Like Tom said...........

I have an old BC-640 rig here that was over six feet tall that used those tubes. I don't have the PS but most of the panels. I'm going to take some pictures of it and post them on here so you can see some of the lay out of some of the stuff. They were a WW2 transmitter that was used as a base transmitter for aircraft comm. I read an article on how they were way worst than a BC-610 for wiping out every TV in town before cable TV came rolling into towns.

I seen one that was on eBay that was like factory new and surprisingly it brought over a G note which means it went to a serious collector that will hold it at bay from the junk yard electowolfs (parts Ahole's) for a few more years........

Thanks

I will be anxiously waiting or the photos. I have not seen any photos of this tube in operation.

Pat
N4LTA

Ok. Pat, it will be in about a week as I am heading for my camp right now. Don't forget to remind me if I should forget to post! I get tied up in BS and sometimes forget:)

https://www.google.com/search?q=3c24+tube+in+operation&tbm=isch&ved=2ahUKEwjB0-iB04LsAhXWn-AKHQreBoIQ2-cCegQIABAA&oq=3c24+tube+in+operation&gs_lcp=CgNpbWcQA1Djclj9fGDzf2gAcAB4AIABUogBlQKSAQE0mAEAoAEBqgELZ3dzLXdpei1pbWfAAQE&sclient=img&ei=3QNtX4HxHNa_ggeKvJuQCA&bih=937&biw=1920&hl=en#imgrc=lkstGSi80UtDpM


Here's two in audio operation. Looks like the sockets are sub-mounted a little.

Mine were very bright, like a lightbulb when the filaments were lit.  With big grid drive they really put out the power for such old, small triodes.

T

And another:

http://doityourselfaudio.blogspot.com/2012/07/3c24-se-amplifier.html