BINGO!
thanks.
g.
----- Original Message -----
From: <pegasus@mho.net>
To: "Phil Clements" <philc@texascellnet.com>
Cc: "'Gary Myers'" <garymyers@powerc.net>; <w9ac@arrl.net>
Sent: Thursday, February 08, 2007 11:28 PM
Subject: Re: [Amps] General question on filament life
:
: > I have 2 amps here; one is "instant-on" and one has a 4
minute delay at
: > start-up. The latter is turned on every time I turn on my
transceiver. I
: > don't think of it as a separate "accessory." I use it for
every QSO I
: > make.
: > I have too much respect for my fellow operators. I try to
supply them with
: > the best possible signal so they won't have to listen to
noise and fading.
: > I
: > too have missed some juicy DX in the past waiting for the
amp to warm up!
: >
: > (((73)))
: > Phil, K5PC
:
: Hello Phil, et al,
: I've had several lengthy conversations with Reid Brandon,
chief
: applications engineer for Eimac regarding filamant life and
tube
: health. We have discussed how power tubes last tens of
thousands of
: hours in commercial service, yet often a small fraction of
that in
: amateur service despite the fact that they aren't generally
worked as
: hard. After investigating the operating habits of hams with
high
: failure rates he's found that they very often have operating
habits
: that contain several schedules a day where the amp is cycled
on and off
: each time. One documented (and extensive) study that is
cited by
: Eimac conducted in the commercial environment found that each
time a
: power tube is turned on it loses about 60 hours of it's
expected life
: as compared to a constant-on condition. Some hams can go
25-30 years
: between tube failures, while others seem to be changing them
all the
: time. There are lots of variables, but Reid said the high
cycle rate
: jumps out as a common condition.
: 73,
: Dennis
: N0SP
:
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