HV transformer

[christine]

hi!
I just brought home my new HV transformer, which was
made to my specifications.:

primary 230V 22A
secondary
two windings, each:
800-1000-1100-1200-1300-1400V at 2A

in this way I can connect the windings in parallell or
serie for a multipurpose HV power unit from
about 110V - 4000V at 2A depending on what
tubes I'll use in the amplifier.
the transformers weight is about 36kg...(80 pounds)

I am right now building a middlepower using
one GU84 with tunable vacuumcapacitors and rollercoil..
it's easy to add another one for more power and I don't
have to build a new HV power unit :-)

at the moment I use this new transformer in my old, small and heavily
modified GLA-1000 with 4xPL519 (transformer outside the case on the floor,
of course!)
as the original transformer is not giving enough power for those tubes.
not much left of the original GLA-1000, added 160m etc etc

I power the tubes heating with stabilized 40V from a separate transformer
as the tubes, which are made for serial heating, are that much different,
they get voltages from 39-41V in serial and I wanted tto have 40V for
each tube :-)

cheers,

cb

[Bill Turner]

ORIGINAL MESSAGE:

On Fri, 23 Dec 2005 16:54:26 +0200, "christine" >
wrote:

>
>in this way I can connect the windings in parallell or
>series


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Be careful when connecting the windings in series. The increased
voltage may be more than the insulation can handle unless you
specified it that way.

73, Bill W6WRT

[christine]

hi!

thanks for the remark!
the two windings are actually wound separately on an
"O" core and specified to be used both in serial and paralell connection.'

cheers,

cb

"Bill Turner"
> On Fri, 23 Dec 2005 16:54:26 +0200, "christine" >
>>in this way I can connect the windings in parallell or
>>series

> Be careful when connecting the windings in series. The increased
> voltage may be more than the insulation can handle unless you
> specified it that way.

[Ken Scharf]

christine wrote:
> hi!
> I just brought home my new HV transformer, which was
> made to my specifications.:
>
> primary 230V 22A
> secondary
> two windings, each:
> 800-1000-1100-1200-1300-1400V at 2A
>
> in this way I can connect the windings in parallell or
> serie for a multipurpose HV power unit from
> about 110V - 4000V at 2A depending on what
> tubes I'll use in the amplifier.
> the transformers weight is about 36kg...(80 pounds)
>
> I am right now building a middlepower using
> one GU84 with tunable vacuumcapacitors and rollercoil..
> it's easy to add another one for more power and I don't
> have to build a new HV power unit :-)
>
> at the moment I use this new transformer in my old, small and heavily
> modified GLA-1000 with 4xPL519 (transformer outside the case on the floor,
> of course!)
> as the original transformer is not giving enough power for those tubes.
> not much left of the original GLA-1000, added 160m etc etc
>
> I power the tubes heating with stabilized 40V from a separate transformer
> as the tubes, which are made for serial heating, are that much different,
> they get voltages from 39-41V in serial and I wanted tto have 40V for
> each tube :-)
>
> cheers,
>
> cb
>
>
>
>
>
>
WoW some transformer! That one will do a full gallon and then some
without breaking a sweat! I hate to ask what it cost! Sounds
like a universal replacement for any tube linear.

[christine]

lol!

actually it wasn't very expensive. it's custom made by
a transformer manufacturer and the price was some
340.-E which will add up to a little more in US-dollars

i thought first on making it with a ferrite core to save some
space and weight, but they said there is an insulation problem
with high voltages and the cost would be much higher...

cheers,

cb

"Ken Scharf"

> christine wrote:
>> primary 230V 22A
>> secondary
>> two windings, each:
>> 800-1000-1100-1200-1300-1400V at 2A
>> weight 80 pounds (36kg)

> WoW some transformer! That one will do a full gallon and then some
> without breaking a sweat! I hate to ask what it cost! Sounds
> like a universal replacement for any tube linear.