|
Power Transformer for a pair of 3CX3000A7
Hello All:
Looking for a good sized power transformer. Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out at 4 to 5 amps. Will be using a input choke power supply so that will keep the Plate Voltage at the manufacture spec's of around 5 grand on the plates. For a pair of 3CX3000A7 tubes. Jay in the Mojave |
On Sat, 12 Feb 2005 07:18:49 -0800, Jay in the Mojave
wrote in : Hello All: Looking for a good sized power transformer. Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out at 4 to 5 amps. Will be using a input choke power supply so that will keep the Plate Voltage at the manufacture spec's of around 5 grand on the plates. You might have better luck running single-phase, then all you would need is a small pole-pig that you can get for a couple bills in just about any well-stocked junkyard. Otherwise you will probably have to roll your own, which can get quite expensive (iron, copper, oil, can, vacuum pump, etc). So how much are you planning to spend on this transformer? ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
"Frank Gilliland" wrote in message ... On Sat, 12 Feb 2005 07:18:49 -0800, Jay in the Mojave wrote in : Hello All: Looking for a good sized power transformer. Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out at 4 to 5 amps. Will be using a input choke power supply so that will keep the Plate Voltage at the manufacture spec's of around 5 grand on the plates. You might have better luck running single-phase, then all you would need is a small pole-pig that you can get for a couple bills in just about any well-stocked junkyard. Otherwise you will probably have to roll your own, which can get quite expensive (iron, copper, oil, can, vacuum pump, etc). So how much are you planning to spend on this transformer? Good call, Frank. A single phase, 15-25KVA pole pig, standard residential has 240 volt input, and should work nicely. Incidentally, all three phase is 240, 277, or 480. There is no more 220 or 440, unless you change the taps or rewind one. Much like the mis-stated 110, which is actually 120. |
On Sun, 13 Feb 2005 03:47:46 GMT, "U Know Who"
wrote: "Frank Gilliland" wrote in message .. . On Sat, 12 Feb 2005 07:18:49 -0800, Jay in the Mojave wrote in : Hello All: Looking for a good sized power transformer. Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out at 4 to 5 amps. Will be using a input choke power supply so that will keep the Plate Voltage at the manufacture spec's of around 5 grand on the plates. You might have better luck running single-phase, then all you would need is a small pole-pig that you can get for a couple bills in just about any well-stocked junkyard. Otherwise you will probably have to roll your own, which can get quite expensive (iron, copper, oil, can, vacuum pump, etc). So how much are you planning to spend on this transformer? Good call, Frank. A single phase, 15-25KVA pole pig, standard residential has 240 volt input, and should work nicely. Incidentally, all three phase is 240, 277, or 480. There is no more 220 or 440, unless you change the taps or rewind one. Much like the mis-stated 110, which is actually 120. I don't think thats totally true Randy. I installed a BGA solder station that required 240. The only circuit I had open was a 3 phase circuit. Only 208 volts betwwen legs, I had to put a buck/boost transformer on it to get the voltage up to 240 to get it to run correctly. Most local transmission voltages are 44 kV, 27.6 kV, 13.8 kV and 6.9 kV. A little higher than what Jay was looking for. |
On Sun, 13 Feb 2005 13:47:19 GMT, Lancer wrote in
: On Sun, 13 Feb 2005 03:47:46 GMT, "U Know Who" wrote: "Frank Gilliland" wrote in message . .. On Sat, 12 Feb 2005 07:18:49 -0800, Jay in the Mojave wrote in : Hello All: Looking for a good sized power transformer. Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out at 4 to 5 amps. Will be using a input choke power supply so that will keep the Plate Voltage at the manufacture spec's of around 5 grand on the plates. You might have better luck running single-phase, then all you would need is a small pole-pig that you can get for a couple bills in just about any well-stocked junkyard. Otherwise you will probably have to roll your own, which can get quite expensive (iron, copper, oil, can, vacuum pump, etc). So how much are you planning to spend on this transformer? Good call, Frank. A single phase, 15-25KVA pole pig, standard residential has 240 volt input, and should work nicely. Incidentally, all three phase is 240, 277, or 480. There is no more 220 or 440, unless you change the taps or rewind one. Much like the mis-stated 110, which is actually 120. I don't think thats totally true Randy. I installed a BGA solder station that required 240. The only circuit I had open was a 3 phase circuit. Only 208 volts betwwen legs, I had to put a buck/boost transformer on it to get the voltage up to 240 to get it to run correctly. Most local transmission voltages are 44 kV, 27.6 kV, 13.8 kV and 6.9 kV. A little higher than what Jay was looking for. The voltage isn't as important as the ratio; i.e, you can run a 480 volt transformer at 240 to get a lower output. And since older pigs came in all kinds of sizes and ratios, you never know what's available until you look. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Hello Frank:
Yes we did have better luck goin the single phase route. But do have single and three phase avialable. After making a new type of quad/yagi type of beam for 2 meters and listening in on the ZOO channel 147.435 MHz and a few other Los Angles 2 meter repeaters I heard a conversation talking about a 10KW broadcast transmitter that had some sort of shipping and or fire damage, but the power supply was in good shape, down in San Pedro California. I called the guy and will have the place and insurance point of contact Monaday. But it does use 220 or 240 single phase, we will see. If this was really for a 10 KW Transmitter tha used a pair of 3CX3000 or a single 3CX6000 then this may be the ticket. Jay in the Mojave Frank Gilliland wrote: On Sat, 12 Feb 2005 07:18:49 -0800, Jay in the Mojave wrote in : Hello All: Looking for a good sized power transformer. Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out at 4 to 5 amps. Will be using a input choke power supply so that will keep the Plate Voltage at the manufacture spec's of around 5 grand on the plates. You might have better luck running single-phase, then all you would need is a small pole-pig that you can get for a couple bills in just about any well-stocked junkyard. Otherwise you will probably have to roll your own, which can get quite expensive (iron, copper, oil, can, vacuum pump, etc). So how much are you planning to spend on this transformer? |
Jay in the Mojave wrote:
After making a new type of quad/yagi type of beam for 2 meters and listening in on the ZOO channel 147.435 MHz and a few other Los Angles 2 meter repeaters I heard a conversation talking about a 10KW broadcast transmitter that had some sort of shipping and or fire damage, but the power supply was in good shape, down in San Pedro California. I called the guy and will have the place and insurance point of contact Monaday. But it does use 220 or 240 single phase, we will see. If this was really for a 10 KW Transmitter tha used a pair of 3CX3000 or a single 3CX6000 then this may be the ticket. Jay in the Mojave A pair of 3CX3000A7 has no legitimate use on ham or CB. Jay, you are like the guy who walks into the break room at work and says "Hi, does anyone know where I can get a detonator for some C4?". IOW, he is saying it only to impress his buddies. |
"Lancer" wrote in message ... On Sun, 13 Feb 2005 03:47:46 GMT, "U Know Who" wrote: "Frank Gilliland" wrote in message . .. On Sat, 12 Feb 2005 07:18:49 -0800, Jay in the Mojave wrote in : Hello All: Looking for a good sized power transformer. Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out at 4 to 5 amps. Will be using a input choke power supply so that will keep the Plate Voltage at the manufacture spec's of around 5 grand on the plates. You might have better luck running single-phase, then all you would need is a small pole-pig that you can get for a couple bills in just about any well-stocked junkyard. Otherwise you will probably have to roll your own, which can get quite expensive (iron, copper, oil, can, vacuum pump, etc). So how much are you planning to spend on this transformer? Good call, Frank. A single phase, 15-25KVA pole pig, standard residential has 240 volt input, and should work nicely. Incidentally, all three phase is 240, 277, or 480. There is no more 220 or 440, unless you change the taps or rewind one. Much like the mis-stated 110, which is actually 120. I don't think thats totally true Randy. I installed a BGA solder station that required 240. The only circuit I had open was a 3 phase circuit. Only 208 volts betwwen legs, I had to put a buck/boost transformer on it to get the voltage up to 240 to get it to run correctly. You're right! I forgot about 208! |
"Lancer" wrote in message ews.com... bbOn Sun, 13 Feb 2005 06:52:16 -0800, Frank Gilliland wrote: On Sun, 13 Feb 2005 13:47:19 GMT, Lancer wrote in : On Sun, 13 Feb 2005 03:47:46 GMT, "U Know Who" wrote: "Frank Gilliland" wrote in message m... On Sat, 12 Feb 2005 07:18:49 -0800, Jay in the Mojave wrote in : Hello All: Looking for a good sized power transformer. Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out at 4 to 5 amps. Will be using a input choke power supply so that will keep the Plate Voltage at the manufacture spec's of around 5 grand on the plates. You might have better luck running single-phase, then all you would need is a small pole-pig that you can get for a couple bills in just about any well-stocked junkyard. Otherwise you will probably have to roll your own, which can get quite expensive (iron, copper, oil, can, vacuum pump, etc). So how much are you planning to spend on this transformer? Good call, Frank. A single phase, 15-25KVA pole pig, standard residential has 240 volt input, and should work nicely. Incidentally, all three phase is 240, 277, or 480. There is no more 220 or 440, unless you change the taps or rewind one. Much like the mis-stated 110, which is actually 120. I don't think thats totally true Randy. I installed a BGA solder station that required 240. The only circuit I had open was a 3 phase circuit. Only 208 volts betwwen legs, I had to put a buck/boost transformer on it to get the voltage up to 240 to get it to run correctly. Most local transmission voltages are 44 kV, 27.6 kV, 13.8 kV and 6.9 kV. A little higher than what Jay was looking for. The voltage isn't as important as the ratio; i.e, you can run a 480 volt transformer at 240 to get a lower output. And since older pigs came in all kinds of sizes and ratios, you never know what's available until you look. I just don't remember any transmission voltages being 5K or a mutiple of it. The PCB oil in them might be fun to play with... That wouldn't be transmission voltage, it would be distribution. |
"Lancer" wrote in message news:3gdv0193f9cafaph3ph9s3l0bgbedm24n0@2355323778 ... On Sun, 13 Feb 2005 18:43:55 GMT, "U Know Who" wrote: "Lancer" wrote in message ynews.com... bbOn Sun, 13 Feb 2005 06:52:16 -0800, Frank Gilliland wrote: On Sun, 13 Feb 2005 13:47:19 GMT, Lancer wrote in : On Sun, 13 Feb 2005 03:47:46 GMT, "U Know Who" wrote: "Frank Gilliland" wrote in message news:74ts01lkropbvpqfjvch5s16gnrrksbho9@4ax. com... On Sat, 12 Feb 2005 07:18:49 -0800, Jay in the Mojave wrote in : Hello All: Looking for a good sized power transformer. Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out at 4 to 5 amps. Will be using a input choke power supply so that will keep the Plate Voltage at the manufacture spec's of around 5 grand on the plates. You might have better luck running single-phase, then all you would need is a small pole-pig that you can get for a couple bills in just about any well-stocked junkyard. Otherwise you will probably have to roll your own, which can get quite expensive (iron, copper, oil, can, vacuum pump, etc). So how much are you planning to spend on this transformer? Good call, Frank. A single phase, 15-25KVA pole pig, standard residential has 240 volt input, and should work nicely. Incidentally, all three phase is 240, 277, or 480. There is no more 220 or 440, unless you change the taps or rewind one. Much like the mis-stated 110, which is actually 120. I don't think thats totally true Randy. I installed a BGA solder station that required 240. The only circuit I had open was a 3 phase circuit. Only 208 volts betwwen legs, I had to put a buck/boost transformer on it to get the voltage up to 240 to get it to run correctly. Most local transmission voltages are 44 kV, 27.6 kV, 13.8 kV and 6.9 kV. A little higher than what Jay was looking for. The voltage isn't as important as the ratio; i.e, you can run a 480 volt transformer at 240 to get a lower output. And since older pigs came in all kinds of sizes and ratios, you never know what's available until you look. I just don't remember any transmission voltages being 5K or a mutiple of it. The PCB oil in them might be fun to play with... That wouldn't be transmission voltage, it would be distribution. True.. speaking of transformers check out this link.. http://www.compfused.com/directlink/403/ Ouch.......there goes a couple million bucks! |
On Sun, 13 Feb 2005 07:09:44 -0800, Jay in the Mojave
wrote in : Hello Frank: Yes we did have better luck goin the single phase route. But do have single and three phase avialable. After making a new type of quad/yagi type of beam for 2 meters and listening in on the ZOO channel 147.435 MHz and a few other Los Angles 2 meter repeaters I heard a conversation talking about a 10KW broadcast transmitter that had some sort of shipping and or fire damage, but the power supply was in good shape, down in San Pedro California. I called the guy and will have the place and insurance point of contact Monaday. But it does use 220 or 240 single phase, we will see. If this was really for a 10 KW Transmitter tha used a pair of 3CX3000 or a single 3CX6000 then this may be the ticket. The problem is that you are getting into a power range that usually requires custom-built components. It would be much easier to build up a transmitter around a 10kW transformer, instead of building it up around the tubes which are pretty much standardized components. But why are you even messing with triodes? Unless you like to constantly readjust the neutralizing cap, or you run them grounded grid and pump in a kW or so, you might be much better off with a couple large tetrodes. Broadcast pulls are cheap, in regular supply, are usually 80%+, and will last a long time running them AB1 which requires almost no drive power at all. Get even bigger tubes and you can reduce the heater voltage which will make the tubes last even longer. Plus, if you use resistance coupling then you can open up the input bandwidth -and- disregard the need for neutralization, with much better efficiency and longer tube life than grounded-grid triodes. Just something to think about. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Hello Frank:
Yeah ok on the Triodes, there were dirt cheap, so thats what we are using them. They will need a significant driver buts thats easy. I have the power supply setting in my front yard setting on a pallet, with a tarp over it now. Loooooooooooooong story! The power levels this will generate will be no dought be significant and larger than I care to admit to, and coax and connectors will be used. This isn't for use as a on the air linear amplifer, but for spectral analyst for mining. In the Mojave Desert of course. Enough said. I don't know what would be used as coax and a matching section for antenna at these power levels. But can only image that it would be big bucks incorporated. With many Capital Dollars signs. I also have a line on a 10KW radio station in Bishop California. But probably will not need it. If this amp is able to produce the arc for spectral analysts chamber as we think it will, it will allow a new concept in mining. The real ball cruncher here will be the diesel generator that must be flown in or a Bull Dozer will be needed to make a road into the area at a truck load of money. If the process works as we think it will a professional amp will be bought later on But only after the process is verified, but when starting out cheap and inexpensive methods must be taken. Jay in the Mojave Frank Gilliland wrote: On Sun, 13 Feb 2005 07:09:44 -0800, Jay in the Mojave wrote in : Hello Frank: Yes we did have better luck goin the single phase route. But do have single and three phase avialable. After making a new type of quad/yagi type of beam for 2 meters and listening in on the ZOO channel 147.435 MHz and a few other Los Angles 2 meter repeaters I heard a conversation talking about a 10KW broadcast transmitter that had some sort of shipping and or fire damage, but the power supply was in good shape, down in San Pedro California. I called the guy and will have the place and insurance point of contact Monaday. But it does use 220 or 240 single phase, we will see. If this was really for a 10 KW Transmitter tha used a pair of 3CX3000 or a single 3CX6000 then this may be the ticket. The problem is that you are getting into a power range that usually requires custom-built components. It would be much easier to build up a transmitter around a 10kW transformer, instead of building it up around the tubes which are pretty much standardized components. But why are you even messing with triodes? Unless you like to constantly readjust the neutralizing cap, or you run them grounded grid and pump in a kW or so, you might be much better off with a couple large tetrodes. Broadcast pulls are cheap, in regular supply, are usually 80%+, and will last a long time running them AB1 which requires almost no drive power at all. Get even bigger tubes and you can reduce the heater voltage which will make the tubes last even longer. Plus, if you use resistance coupling then you can open up the input bandwidth -and- disregard the need for neutralization, with much better efficiency and longer tube life than grounded-grid triodes. Just something to think about. |
On Mon, 14 Feb 2005 19:34:12 -0800, Jay in the Mojave
wrote in : snip The power levels this will generate will be no dought be significant and larger than I care to admit to, and coax and connectors will be used. Coax? .....uh, I hope you are planning on hardline. This isn't for use as a on the air linear amplifer, but for spectral analyst for mining. In the Mojave Desert of course. Enough said. I don't know what would be used as coax and a matching section for antenna at these power levels. But can only image that it would be big bucks incorporated. With many Capital Dollars signs. I also have a line on a 10KW radio station in Bishop California. But probably will not need it. If this amp is able to produce the arc for spectral analysts chamber as we think it will, it will allow a new concept in mining. I'm not clear about your plan, but if you're thinking NMR then it's already been tried with dismal results. The problem is that most minerals have enough conductivity to render the results useless. But if you figured out a solution then go for it. The real ball cruncher here will be the diesel generator that must be flown in or a Bull Dozer will be needed to make a road into the area at a truck load of money. How about a PTO generator? You can take 10-25kVA right from the truck. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
| All times are GMT +1. The time now is 06:06 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com