This reminds me of a homebrew amplifier I got some years ago. I replaced the
missing parts and installed a good 3-500z only to find the output was very
low. I assume that why the builder gave up on it and I got it cheap. Come to
find out that the filament voltage was low. The problem was that the builder
did use a 5 volt transformer but did not take into account the drop across the
filament choke. I installed a boost transformer in the primary to set the
filament voltage at the socket to 5 volts.
73
Bill wa4lav
-----Original Message-----
From: NI4L <ni4l@charter.net>
To: amps@contesting.com
To: <amps@contesting.com>
Date: Thu, 04 Jul 2002 02:34:33 -0400
Subject: [Amps] 4-250A question
the filiament voltage ........ for the 4-250A tubes can you go over a
bit, say to 6 volts?
will this adversly affect the tube what i really need to know will it
kill it right away.
What is the max filiament voltage any of you have put on this tube and
made it last and preform to your satisfaction?
thanks for any help you can give
Chris NI4L
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