[Boatanchors] PLATE XFMR

[Larry WA9VRH]

So Dave let me get this correct...

Someone who claims to be a supporter of Collins, and other boatanchor 
equipment is telling us
that no matter what you may want of my collection of iron if your not 
willing to pay scrap prices
buzz off??

Way to go Dave showing your real colors.

What a sorry ass person..

73 Larry WA9VRH

----- Original Message ----- 
From: "David Knepper" <collinsradio at comcast.net>
To: <amateur-repairs at yahoogroups.com>
Cc: <boatanchors at mailman.qth.net>
Sent: Monday, April 04, 2011 1:28 PM
Subject: Re: [Boatanchors] PLATE XFMR


>I would dearly love to dispose of my heavy iron but with the price of 
>copper
> today, I may just sell my transformers for scrap, unless, of course, 
> someone
> is need of some large plate, modulation, etc. transformers.
>
> Please do not ask me for a list.  Come inspect and then make an offer as
> long as it beats the price of copper.
>
> Thank you
>
>
> David Knepper, W3CRA/W3ST
> Editor of the Collins Journal
> Secretary of the Collins Radio Association
> www.collinsra.com
> Now on Facebook
> Join today
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: <jfor at quik.com>
> Cc: <boatanchors at mailman.qth.net>
> Sent: Monday, April 04, 2011 2:23 PM
> Subject: Re: [Boatanchors] PLATE XFMR
>
>
>> There have been several different grades of transformer iron made since
>> the
>> 20's with each new one being more efficient.
>>
>> You can trust the ARRL to be a step behind.
>>
>> Ive used the dummy load method many times to monitor temperature rise 
>> when
>> an open frame xfmr makes it easy. OTOH, those cast iron end bells take
>> ages
>> to absorb the heat and the windings could be toast by the time you 
>> realize
>> it. And you never know what is inside a sealed unit.
>>
>> The problem with old design high impedance windings is that a choke input
>> is
>> necessary to get any reasonable regulation under changing loads. You 
>> could
>> do it with a lot of C only but that requires a lot of wasted bleeder
>> current. Best keep the old iron with Class C amps and modulators.
>>
>> Carl
>> KM1H
>>
>>
>>
>> ----- Original Message ----- 
>> From: "J. Forster" <jfor at quik.com>
>> To: "Bill and Liz McHugh" <magoo at isp.ca>
>> Cc: <boatanchors at mailman.qth.net>
>> Sent: Monday, April 04, 2011 1:57 PM
>> Subject: Re: [Boatanchors] PLATE XFMR
>>
>>
>>> Roughly 40 watts/pount at 60 Hz for a transformer made with standard
>>> (cheap) iron.
>>>
>>> -John
>>>
>>> ===============
>>>
>>>
>>>
>>>> Some time ago I recall someone providing a "rule of thumb" one might 
>>>> use
>>>> to estimate the current capacity of a plate transformer based on weight
>>>> and dimensions.
>>>>
>>>> I have a Hammond with an REL number which is not in any catalog and
>>>> would
>>>> like to be able to use it in a supply for an 813 rig I am building.
>>>>
>>>> Anyone have that "rule of thumb" at hand?
>>>>
>>>> Bill VE3NH
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>>>>
>>>>
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>>>>
>>>
>>>
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>>>
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>>
>> ______________________________________________________________
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>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
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> Help: http://mailman.qth.net/mmfaq.htm
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>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html