FWIW,
I run four DX-100s in various systems, and the quickest way I know to
burn out the HV transformer is to solid state the power supply. Caveaut
Emptor, but I did the solid sate thing, it ran for a couple of weeks, then
poof!
HV transformer went. Only thing I know that does it quicker is Paul W0RWs
DX-100 in Beacon mode on 480KC, that went pretty quick and it wasn't
solid stated, I don't believe.
Keep in mind the rigs are older than most of us, was probably abused by
someone
at one time or another, and really prefers the circuit designed for it. I
ended up with
a lot of them (DX-100) because it was easier to buy the whole rig than wait
for
parts that fit and work properly. As usual, YMMV!
Jim
WB2FCN
----- Original Message -----
From: "Stevan A. White" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Heathkit Mail List" <[EMAIL PROTECTED]>;
"AM Radio Mail List" <[email protected]>; "New Old Stock Group"
<[EMAIL PROTECTED]>
Sent: Friday, April 27, 2007 11:18 AM
Subject: [AMRadio] SS Rectifier Replacements
Greetings All,
I have a DX-100 I'm working on (albeit slowly) getting on the air. I'm
going to make a few modifications to the audio circuit to satisfy my
vanity, change caps and replace the tube rectifiers with solid state. I
know that this will give me a few more volts and stabilize the PS circuit
somewhat.
I have run across the 1N1239 replacement which seems to be the standard
replacement for a long list of tube rectifiers including the 5R4, 5U4, and
5V4 to name a few. That's handy for me because I can replace my HV and LV
rectifiers with the socketed solution and not cut up the circuit too
badly. At the most, I'll have to resolder a wire on the socket.
Everything will still be nice and clean.
My concerns are simple. What can I expect in the way of problems if I use
these marvelous devices? Since I'll be changing the filter caps anyway,
should I beef them up somewhat? What is the recommended value to use with
the 1N1239. Anything else to expect or look for, namely inrush current
problems?
______________________________________________________________
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:[email protected]
To unsubscribe, send an email to [EMAIL PROTECTED] with
the word unsubscribe in the message body.
