I loaned a 4CX25000 to VOA in the Philippines years ago. For me it was a final tube in a given transmitter. For them it was a driver stage. They replaced my tube a month or so later. Also in that VOA transmitter, they used a 4CW250000 in the final stage. The only difference between the internal guts of the 4CX25000 and the 4CW250000 tube was the 4CX25000 is, of course, forced air cooled and the 4CW250000 is water cooled. Otherwise perty much the same internal parts in both tubes. In my TX, the Harris exciter put out 100 mw to a TO3 transistor at 2 watts, to a ceramic 3cx350 (I think? Too many years ago). Then to a 5CX5000 driver and finally the 4CX25000 final. Great video! Tubes rule!
Econco has always treated me well with their rebuilds, but they are harder and harder to get. Thankfully, they were able to rebuild the last one I sent them and I am banking that with them.
Used to have several 3cx150,000h3 tubes at work that after a few years (4-6) of hard use would be sent in to be rebuilt. Each time it would come back it would not last as long as the one before. Of course it was a bit less money, and it didn't take long to swap it out of it went bad, but it got to be a little to often to suit me. We did try a few YD1212, and they were a little tougher, but in our application it got a lot of rough use.
Now that is a tube ! The broadcast AM transmitter I worked on has 4CW25000 output tubes. Ben using re bult tubes for years. always have a set or 2 on hand. we have our station call letters engraved on tube. Hi power stations still use TUBE outputs. The outher AM station near buy has 300V MOSFETS . and they change modules quite often. static from winter storms main cause. Blizzard a few years ago we had thunder snow. tower took a hit . feed line arced over taking main transmitter off line and went to lower power backup and back up feed line. was fun filling out reports and getting a crew together to repair feed line and we was a state of emergency due to winter storm. I spent the night at transmitter cite with lots of coffee and microwave dinners and the power was out and on generator most of night. when all done only damage was feedline and a tower light only one went out. 73's
I Live in Denmark 🇩🇰 the country Is.way way too small to the huge Watt!! I got 3Cx1500 DOING 3k In 7/8hard line ..and a 5element Modded longjohn 10kw ballu And a SIRIO /TARGA 5KW 7/8
@@WildBillQRORESPECT !! THAT's a huge country Same population numbers 90ft tower !! T²x tail twister 7/8 hardline and ECOFLEX 15 OVER ROTOR And 7/8 as jumper cabels
Interesting, we got some used power tubes from our c02 lasers that we cant do anything with... they are 22kv i think. Water cooled. Might be able to sell them to ya for cheap
Yup - but improving your antenna can get you a lot more dbs - and that's on receive as well as transmit - and cut out QRM as well. Always look at your antenna before increasing your power. If you are doing 2-way comms (as opposed to broadcast) there really is little point in blasting out so much power that the whole World can hear you but you can't hear anyone who is replying because you're using a bit of wet string as an antenna.
@@arnoldgrubbs2005 Yes, although sadly there is often little you can do about noise coming from surrounding neighbours and infrastructure even if you identify exactly where it is coming from. LED lights might be "green" but some of them generate wideband noise up to VHF frequencies.
i was wondering, are there any red dots still available? i want to upgrade my two pill cobra base amp, and i know there are a lot of fake ones out there
I loaned a 4CX25000 to VOA in the Philippines years ago. For me it was a final tube in a given transmitter. For them it was a driver stage. They replaced my tube a month or so later. Also in that VOA transmitter, they used a 4CW250000 in the final stage. The only difference between the internal guts of the 4CX25000 and the 4CW250000 tube was the 4CX25000 is, of course, forced air cooled and the 4CW250000 is water cooled. Otherwise perty much the same internal parts in both tubes. In my TX, the Harris exciter put out 100 mw to a TO3 transistor at 2 watts, to a ceramic 3cx350 (I think? Too many years ago). Then to a 5CX5000 driver and finally the 4CX25000 final. Great video! Tubes rule!
Amazing. Never heard of VOA
That is one big tube Mr. BBI, thanks for sharing.
Ótimo vídeo trabalho gualidade total parabéns guerreiros BBI bazuka Foz do Iguaçu pr Brasil 🇧🇷🇧🇷
Econco has always treated me well with their rebuilds, but they are harder and harder to get. Thankfully, they were able to rebuild the last one I sent them and I am banking that with them.
She is a beauty.
Big boy steel baby
Used to have several 3cx150,000h3 tubes at work that after a few years (4-6) of hard use would be sent in to be rebuilt. Each time it would come back it would not last as long as the one before. Of course it was a bit less money, and it didn't take long to swap it out of it went bad, but it got to be a little to often to suit me. We did try a few YD1212, and they were a little tougher, but in our application it got a lot of rough use.
that yd1212 is a bad ass tube
I use similar in FM broadcast transmitters.
Damn.... I don't think I've ever seen one like that where the silver was so immaculate and untarnished.
Oh great, another "how to open a box" video. Now my life is complete!
You got it ;)
So, is this what you're gonna use as a pre driver for your new base amp? ;)
It is my hope that someday Mr BBi comes across an Eimac X2159 tube and builds a REALLY BIG amp !!
sweet ,busted out
Now that is a tube ! The broadcast AM transmitter I worked on has 4CW25000 output tubes. Ben using re bult tubes for years. always have a set or 2 on hand. we have our station call letters engraved on tube. Hi power stations still use TUBE outputs. The outher AM station near buy has 300V MOSFETS . and they change modules quite often. static from winter storms main cause. Blizzard a few years ago we had thunder snow. tower took a hit . feed line arced over taking main transmitter off line and went to lower power backup and back up feed line. was fun filling out reports and getting a crew together to repair feed line and we was a state of emergency due to winter storm. I spent the night at transmitter cite with lots of coffee and microwave dinners and the power was out and on generator most of night. when all done only damage was feedline and a tower light only one went out. 73's
lol i thought my 3cx3000a7 was big
I Live in Denmark 🇩🇰 the country
Is.way way too small to the huge
Watt!! I got 3Cx1500 DOING 3k
In 7/8hard line ..and a 5element
Modded longjohn 10kw ballu
And a SIRIO /TARGA 5KW 7/8
I'm in Canada
@@WildBillQRORESPECT !! THAT's a huge country
Same population numbers
90ft tower !! T²x tail twister
7/8 hardline and ECOFLEX 15 OVER ROTOR
And 7/8 as jumper cabels
Now with that said... When can you build me an amp around that tube ? 💪
Anytime I get something, I have to stare at it for a while.
Fantastic, just Beautiful, Phenomenal, but, What is It?
I own 2 x NOS valves, If treated right, they will see us all out 😉
I wish and hope to see you and Zane at least in Idaho working in some shape or form please and thank you
This for a headphone amplifier project?
Interesting, we got some used power tubes from our c02 lasers that we cant do anything with... they are 22kv i think. Water cooled. Might be able to sell them to ya for cheap
Text me a list of them bro. 2083920108
@@BoxBuilderIdaho ok i'll check to see what we have when i get back in to the shop
Do you know Mike Bach?
hm, almost 1kW for filament heating. nice.
I'm definitely a tube man, it's just not fair that doubling your power only net's 3db! 2 watts to 4.... ok, 10,000 to 20,000... oh come on!
Yup - but improving your antenna can get you a lot more dbs - and that's on receive as well as transmit - and cut out QRM as well. Always look at your antenna before increasing your power. If you are doing 2-way comms (as opposed to broadcast) there really is little point in blasting out so much power that the whole World can hear you but you can't hear anyone who is replying because you're using a bit of wet string as an antenna.
@@davemould4638 OR if you have a lot of crappy power line noise in your area. Need to go on a noise hunt quite often.
@@arnoldgrubbs2005 Yes, although sadly there is often little you can do about noise coming from surrounding neighbours and infrastructure even if you identify exactly where it is coming from. LED lights might be "green" but some of them generate wideband noise up to VHF frequencies.
DENMARK 🇩🇰 🖖 🇩 🇰 🖖 🇩🇰
♥️ ♥️👍👍🖖 3CX1500a7
Denmark 🇩🇰 is way Way too
Small til burn more then 3000Watt
If se do they Will Find us
this made no since to me
i was wondering, are there any red dots still available? i want to upgrade my two pill cobra base amp, and i know there are a lot of fake ones out there
I have a few and I'm holding on to them for repair
What the heck is it..
Is a man allowed to oogle another man's tube?
Umm what even is it? For all i know its a vacuum filter for a kirby floor cannon.... How did i end up here?
It's a really really really really really really big RF power tube
Hey Young man, you have my address... RIGHT?
What the hell does that go in
Why the rubber gloves
Because the silver plating if my hands touch it will leave a mark overtime
I think I even set it in the video I'm wearing rubber gloves cuz I don't want to touch it and ruin the Finish
@@BoxBuilderIdaho I don't blame you. It's like a work of art.