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?




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"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.






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"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!

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.

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.




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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.