try antique electronic supply for 100uf caps work just fine in
this rig Russ
From: "MIke Wells" <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: <[email protected]>
Subject: RE: [AMRadio] DRIVER XFMR UPDATE
Date: Fri, 21 Feb 2003 16:36:38 -0700
I have changed the bias supply caps but didn't mess with the LV
multisection
cap in the can and didn't have any replacements for the high voltage caps.
The cathode bypass caps are easy to find so I always start with them. I am
at some what of a loss as to where a person can find replacements for caps
in the 300 working voltages and on up? Is there a big supply out there?
Particularly like the 150mfd 450wv high voltage caps, I don't know where to
find them so I may pick some stuff up at a swap meet but they are probably
as bad as what is in the rig. Where is the best source?
Mike
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of russ dworakowski
Sent: Friday, February 21, 2003 11:51 AM
To: [email protected]
Subject: RE: [AMRadio] DRIVER XFMR UPDATE
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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