Mike there are other caps that need replaced as well. remember this is
50 years old. Cathode bypass caps in the speech amp, also
electrolytics in the bias supply and LV and HV supplies are all culprits
down the road. Change these as a matter of preventive
maint. Russ.
From: "MIke Wells" <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: <[email protected]>
Subject: RE: [AMRadio] DRIVER XFMR UPDATE
Date: Thu, 20 Feb 2003 16:38:59 -0700
Hello guys,
Just thought I would again say thanks to those that helped with comments on
replacing the driver transformer in my DX-100. Bob, W4WSZ sent me out the
exact replacement and I now have it in the unit and playing.
A couple interesting things I found was the new 5V4 low voltage rectifier
tube was bad, must of seen too much current. After replacing the 5V4 and
testing the circuit I saw the 12BY7 was shorted and looked more like a
light
bulb than a tube. I went looking and found the 680 ohm cathod resistor was
burned open. Now I wonder if the resistor failed first, taking the 12BY7
then smoking the driver xfmr causing the 5V4 to die. Or maybe it all
happened when the xfmr went up in smoke. It is back on the air and Chuck,
WA0ZHH and Lonnie W0GPZ said it sounded good.
73
Mike
W0FD
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