[AMRadio] GZ34 Tube

[Brian Harris]

Ron,

You might want to consider doing what I regularly do.....that is.....make a 
solid state replacement by merely breaking the glass envelope of a tube with the 
right base and then removing the guts of the tube from the socket pins.  Wire in 
silicon diodes that will meet your needs.  1N5408's are 1KV 3A units that are 
cheap.  I would suggest 2-3 of these diodes in each leg of the rectifier.  I pot 
the components in epoxy or epoxy a pill bottle over the diode assembly if it's 
too large to cram down inside the old tube base.  Going solid state will lighten 
the load on the power transformer (no rectifier filament to power) 
considerably.  Your B+ will be a little higher but that <usually> is not a 
problem.  If it is, you can insert an appropriate resistor in series between the 
rectifier output and the input to the filter, be it choke or capacitor input.

73,

Brian Harris, WA5UEK
phone 214-763-5977
email cosmophone at yahoo.com
website www.myhamshack.com/wa5uek


When they call the roll in the Senate, the Senators do not know whether to 
answer "present" or "not guilty."  Theodore Roosevelt




________________________________
From: Ronald Doering <wa9qnn at yahoo.com>
To: "amradio at mailman.qth.net" <amradio at mailman.qth.net>
Sent: Thu, February 10, 2011 3:14:49 PM
Subject: [AMRadio] GZ34 Tube

I need a GZ34, or 5AR4 tube for my Eico 720 transmitter.

Does anyone have one they can part with?  Thanks,

Ron ,    WA9QNN




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