I too use my Bose QC-15s in the shack for contesting. With 2 amplifiers
running, it really helps! With the input of the QC15 set to low, it really
works well with my IC7600 or PRO III.
If you look at the BIG contests stations, you will most likely see Bose QC15
in use.
Best investment ever for the ham shack!
73
Jim W7RY
-----Original Message-----
From: Gary Smith
Sent: Sunday, October 19, 2014 11:27 AM
To: Amps@contesting.com
Subject: Re: [Amps] Solid State Amps (or rather the NCL-2000...)
Manfred,
I use the Bose QC-15 noise cancelling headset for the same reason.
Now-a-days there must be other excellent less expensive active
circuit noise cancelling headphones that work as well. There are
custom fit microphone inserts that work well with them, I have one
but can't recall who made it, I found it with an internet search a
few years ago.
FWIW, Last month I needed to return my headsets for warranty (3
year). One call and though I needed to send mine in, they sent me a
new (not refurbished) set with two headset connectors & Airline
stereo adapter plug.
There is a variable wirewound resistor in the circuit of my amplifier
fan. What I'd really like to do is; lower the fan's speed to minimum,
insert a thermal probe into the airstream from my amp's exhaust, have
it trigger a relay when the exhaust temperature rises to 100 degrees
& then raise the fan speed to maximum as it is currently set to. That
would save the fan from early failure, keep it quiet most of the time
and properly cool the tubes when it needs to.
I need to find a small unit that will fit into the amp to do this
cleanly, haven't researched finding those components yet.
73,
Gary
When the time comes and the 8122 tubes fail, if that happens before I have
my
final super top solid state amplifier up and running, then I will consider
what
to do. Maybe they never fail, because I use that amplifier only rarely.
I'm
somewhat allergic to noise, and the blower noise is highly irritating to
me. Not
when I just switch on the amplifier, but after half an hour or so of
constant
blower noise, I start going up the walls, and shut off the amplifier. That
way
the tubes last long! ;-)
Several years ago I installed an acoustic labyrinth at the air inlet, and
replaced the oil by the thickest grade that would allow it to run. The
noise got
slightly lower, but not much.
I often think that when the tubes fail, that would be the cue to get rid
of the
noisy beast!
Manfred
========================
Visit my hobby homepage!
http://ludens.cl
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