[R-390] OT: Humbug transformer

[Gary Pewitt]

Before you do anything else try tightening the screws.  73  Gary  N9ZSV



On 8/3/2010 8:39 PM, L L bahr wrote:
> Barry:
>
> I would buy a gallon of marine grade polyurethane,open the can and drop the whole thing in there and put the can lid back on.  Let it sit in there for a few days.  Maybe even shake the can from time to time to help shake the bubbles out of it.  This is not as good as having it in a vacuum, but I bet it solves your problem.  Then, a few days later remove it from the can and let it bake in the sun for a few days.  An oven would work if you don't have a high temp, but the fumes may not be acceptable to the XYL.  An oven would speed up the process.  Then when you want to use the transformer, you will have to scrape the poly off the solder terminals.  I usually hang the transformer outside on an old coat hanger and let the poly just drip off of it at an angle the drip will look good once hard.  If it is just a loose bobbin in the iron core and not vibrating windings, then all you would have to do is drive a small wood wedge in between the bobbin and the iron core stack.  Sometimes
>    a wedge is needed on both sides and sometimes just on one side.  You will have to determine what is causing the buzz.  Is it the core and bobbin, or wires within the bobbin?
>
> Lee, w0vt
>
>
> ----- Original Message -----
> From: "Barry"<n4buq at knology.net>
> To: R-390 at Mailman.qth.net
> Sent: Tuesday, August 3, 2010 4:06:29 PM GMT -06:00 US/Canada Central
> Subject: [R-390] OT: Humbug transformer
>
> No, this is not a transformer for an R390A.  It is an open-frame style made by Signal Transformer Company.  It has dual primaries and 3 low-voltage outputs (approximately 12v, 15v, and 20v - I forget the exact voltages).
>
> It sounds like it can be fixed via a proper varnishing.  It is about 1/2 the size of an R-390A transformer.
>
> The construction and mounting are similar to the ones shown in the following link (except the windings are not exposed and there are lead wires coming from underneath the tape):
>
> http://www.signaltransformer.com/sites/all/pdf/A41.pdf
>
> Thanks again guys,
>
> Barry - N4BUQ
>
>
>   On Tue 03/08/10  3:54 PM , "LEE BAHR" pulsarxp at embarqmail.com sent:
>    
>> I guess we need to wait and see.  He really didn't say. So anyone could be
>> correct.
>>
>> Lee, w0vt
>>      
>
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