[Boatanchors] DX 100 and DX 100 B

[lee]

I'm thinking a NTE255 or NTE2550 transistor may do the job.  Any comments?

Lee, w0vt



-----Original Message----- 
From: lee
Sent: Monday, October 31, 2011 1:23 PM
To: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] DX 100 and DX 100 B

I think I asked this once before but got no real answer.   If the 4 watt 25K
driver pot goes South in a DX-100, replacements are hard to find.  That
said, WB2SYQ has a nice mod on the internet called, "Low Cost Drive Pot
Replacement".  All it is is a 1 meg linear pot hooked to a pass transistor.
The transistor he used looks like it is in a TO-5 case.  He says use a TV
Horizontal Output Driver Transistor.  OK, sounds good, but which Horizontal
Output transistor?  (There are zillion of them out there with different
configurations).  I am no engineer.  It would seem to me, the transistor
used must be a power transistor and good for high voltage.  I would think a
pass transistor used in a power supply such as a 2N3055 would not be good as
it's voltage rating would be too low even though it's current rating would
be just fine.


Anyone on here who can supply a real transistor number for a transistor
which will work in WB2SYQs circuit?  (The circuit shows it to be a NPN
transistor).  The article gives no real transistor number.  You can find the
article at:     http://www.frn.net/tech/mods/heathdx100/

Lee, w0vt

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