Some years ago I built a power supply rated at 2.8 KV 1A. Since I thought I
might want to
operate it in a 50 Hz. location as well as here in the US, I asked Peter Dahl
(who is now
an SK) about it when I ordered the transformer. He said that the primary of a
60 Hz.
transformer would run very hot on 50 Hz. and he advised ordering it for 50 Hz.
It was
considerably heavier. I think it becomes more important when the transformer
gets larger!
On 4/23/2010 3:45 PM, vk3pa@vk3pa.com wrote:
> Quoting Carl<km1h@jeremy.mv.com>:
> 60hz t/former has less iron in the core causing saturation . on some
> of the yaesu t/f for 60hz when run on 50hz they burn out after a
> couple of years.. its ok to run 50hz t/f on 60 but not the other
> way.in aircraft they use 400hz es less iron still.. even running low
> power on the amp the priamy is still satueating on the t/former
> causing heating "not very good"..
>
>> The transformer will run a little bit warmer so dont push the amp to the
>> last watt. The blower will also turn slower so find a happy balance with
>> your output power and air flow.
>>
>> Dont waste your money on a new transformer, if you ever need to just get the
>> original rewound locally.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message -----
>> From: "John E. Cleeve"<g3jvc@jcleeve.idps.co.uk>
>> To:<amps@contesting.com>
>> Sent: Friday, April 23, 2010 3:18 PM
>> Subject: [Amps] Transformer 50/60hz
>>
>>
>>> Gentlemen,
>>>
>>>
>>>
>>> I would appreciate some advice from the transformer "boffins"
>>> out there. I am in process of refurbishing an Alpha 76PA, which came over
>>> from the USA. I noted, in a recent posting, a link which showed the new
>>> Dahl
>>> transformer availability, and that a 50hz 230v primary transformer is
>>> available for the 76PA. My questions are these, what are likely to be the
>>> noticeable effects on the performance of the 76PA amplifier, with the
>>> present 60hz transformer being run on 50hz and what, if any, will be the
>>> likely long term effects on a transformer designed to run on 60hz when run
>>> on 50hz. Should I "break the bank" and have the available 50hz version
>>> shipped across the pond?
>>>
>>>
>>>
>>> 73, sincerely, John. G3JVC
>>>
--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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