There are some HV rotary switches that can be used but not for hot
switching. Vacuum relays can also be used. I use a well insulated rotary
switch.
Carl
KM1H
----- Original Message -----
From: "Felipe Ceglia - PY1NB" <felipeceglia2@gmail.com>
To: <felipe@dxwatch.com>
Cc: <Amps@contesting.com>
Sent: Monday, November 30, 2009 7:28 PM
Subject: Re: [Amps] 2x 4cx1500b amp
> Hi folks,
>
> Thank you for the replies you sent me.
>
> Regarding the HV transformer, some things that I could gather from your
> replies:
>
> - not use a center tap on the secondary
> - look for hypersil or other good quality iron
> - good copper wire insulation
> - good layer insulation
> - primary taps are a good idea, but them should not go too far.
> - secondary taps are not a seven-headed beast, but I wont be able to
> change that
> on the fly
>
> So, I wonder as having these specs for my price quotations:
>
> primary:
> 0 - 200 - 210 - 220 - 230
>
> secondary
> 0 - 2400 - 2600 - 2800 - 3000 - 3200 - 3400 (no center tap)
>
>
> I believe that will make room for future projects using the same
> transformer.
>
>
> 73 TU,
>
> Felipe
>
>
>
>
>
>
>
>
> Felipe Ceglia - PY1NB wrote:
>> Hello "Ampers",
>>
>> I am willing to build a 2x 4CX1500B amp for 160 to 10m usage. Willing to
>> use a GM3SEK tetrode board for controlling and protecting it.
>>
>> As I will need to special order the HV supply transformer, I am thinking
>> about asking for a multiple voltage primary and a fixed voltage
>> secondary (probably 1250v - 0v - 1250v), so it will be easier to change
>> output voltage just changing the primary, instead of dealing with HV. Is
>> it a bad idea?
>>
>> I would like to hear from you if you have built anything like it, or if
>> you have something to say.
>>
>> Also, are there alternatives to the tetrode board?
>>
>> 73,
>>
>> Felipe - PY1NB
>>
>>
>>
>> _______________________________________________
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>> http://lists.contesting.com/mailman/listinfo/amps
>>
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