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Re: [TenTec] Centurion Bias Transistor Follow on post

To: Michael Marx <sndtubes@vacuumtubes.com>, "TenTec@contesting.com" <TenTec@contesting.com>
Subject: Re: [TenTec] Centurion Bias Transistor Follow on post
From: James Duffer <dufferjames@hotmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 20 Nov 2017 18:18:50 +0000
List-post: <mailto:tentec@contesting.com>
Isn't it in the TO-204-2 package, where the case is the "drain"?
________________________________
From: TenTec <tentec-bounces@contesting.com> on behalf of Michael Marx 
<sndtubes@vacuumtubes.com>
Sent: Monday, November 20, 2017 12:09 PM
To: TenTec@contesting.com
Cc: TenTec@yahoogroups.com
Subject: [TenTec] Centurion Bias Transistor Follow on post

Guys,

I just posted a message about my Centurion with a bias problem.  As I stated I 
replaced the bias transistor which did not fix the problem.  Here is something 
interesting that I don’t understand.  I bought 5 of them from Mouser.  When I 
measure the transistor junctions with my Fluke 87 meter in the diode function, 
one junction seems normal as it measures .5 V in one direction and open in the 
other.  Normal, right? Now the other junction measures open in both directions. 
 It also measures open in ohmmeter mode.  Could I have bought 5 bad 
transistors?  Is that even possible?  What am I doing wrong in testing these 
transistors?  They are just an NPN bipolar transistor, right?  FYI it is an 
MJ15001G by ON.  This is exactly what Ten Tec sent a few years ago when I had 
to replace the transistor.

Very confused.

73
Mike WB0SND


Michael Marx
sndtubes@vacuumtubes.com
636-939-9190

SND Tube Sales
105 N. Division St.
Bonne Terre, MO  63628




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