[Amps] When to leave the amp on vs turn off.

David Robbins k1ttt at verizon.net
Sun Aug 26 12:18:52 EDT 2018

I leave my so2r/remote access amp on unless it is not going to be used for
at least 24 hours... that means unless I know no remote user is expecting to
use it and/or there is a low power contest over a given weekend it stays on.
It is a well known fact that electronics fail more often due to the inrush
currents at startup then while sitting idle.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Gary Smith
Sent: Saturday, August 25, 2018 13:07
To: amps at contesting.com
Subject: [Amps] When to leave the amp on vs turn off.


For years I've turned on the amp when
needed or when anticipated I will likely use it as trying to work a
DXpedetion or sked. Turning off the amp, I've waited till the tubes (pair of
8877 & another amp with a pair of 3-500) are cooled down & then turned off
when done. Sometimes I plan to use the amp later in the day & wonder if I
should turn it off & restart later or better to leave it running.

I've been concerned that frequent
cool-down & warm-up will cause future
leaks from excessive contraction/expansion of the tubes. At the same time I
have concerns for leaving the fan on un-necessarily.

A replacement blower for the old Alpha SX will be less expensive than
replacing tubes but replacement blowers for it I understand, are difficult
to obtain.

I'm interested in thoughts about when it's best to shut down an amp vs
better to leave it running. Other than the obvious mechanical wear on the
fan, is there an issue on the tubes or PS by leaving the amp on but unused
for hours at a time. 

What's a practical rule of thumb?



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