Richard Knoppow wrote:
----- Original Message ----- From: "Garey Barrell" <[email protected]>
To: "Drakelist" <[email protected]>
Sent: Thursday, March 11, 2010 11:12 AM
Subject: Re: [Drakelist] receiver xformer
Geoff -
True! Fortunately, our Drake gear has dual primary transformers, so
just a matter of moving a few wires or even just moving a switch!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Gary, the problem is not with the voltage but the frequency. At
50hz the inductance drops and a larger core is needed, otherwise the
transformer looses efficiency and will run very hot.
Another reason transformers may run hot is from very distorted
waveforms on the power line. At least in the US this is more often the
case than not. Looking at the power line waveform with a good scope
may discover all sorts of things.
I've been running my R4 B all day lately and will check the
transformer later.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
OK... My R-4B has been on all morning (about seven hours). It sits
under an open-backed shelf that is 2.5" above it. The transformer
measures 51.7 degrees Celsius, well within "normal" temperature for
electronic equipment. This receiver DOES have a new "hayseedhamfest"
electrolytic in it, which would probably be the most likely "fault" to
cause increased transformer temperature.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
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