If it were an external anode tube with a indirectly heated cathode a
burn-in period would be appropriate. With a glass envelope tube and a coated
filament, there is no need to burn-in the 3-500. The tube must be operated
with color showing on the place to consume any gas inside the envelope.
The AL-80 does not have a separate FIL and HV switches. When the amp is
turned on, the filament and high voltage is uniformly applied with
appropriate delay of about 1/2 second. The warm-up requirement of the 3-500
is approximately 1 second at which time it is ready to go.
73
Bob, K4TAX
----- Original Message -----
From: "mcelmer1" <mcelmer1@netecin.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, August 03, 2014 8:37 PM
Subject: Re: [TenTec] OT: Need advice checking out a stored 3-500
Second that.
Mike
W8TRN
----- Original Message -----
From: "Rodney" <w3krq@dejazzd.com>
To: <wb5jnc@centurytel.net>; "Discussion of Ten-Tec Equipment"
<tentec@contesting.com>
Sent: Sunday, August 03, 2014 19:10
Subject: Re: [TenTec] OT: Need advice checking out a stored 3-500
put it in your amp only turn on the filament and let it run for 5 or 6
hours until you turn on plate voltage. I know a ham that had 34 304tl
tubes and that what he did.
y
-----Original Message-----
From: Al Gulseth
Sent: Sunday, August 03, 2014 8:41 PM
To: TenTec@contesting.com
Subject: [TenTec] OT: Need advice checking out a stored 3-500
(Posting this for a local fellow ham who currently isn't on the web)
As the subject line says, a local ham friend of mine asked me today about
how
to go about checking out/waking up a 3-500 (Z?) that came as a spare with
his
AL-80A when he bought it a few years back. He's not really sure how long
the
tube had been sitting around unused/un-exercised before he bought the
amp.
I've seen conflicting info on how to go about it, and the last time I had
my
hands on something like that was 30+ years ago when I worked in the
broadcast
industry before I switched to a different career. Any suggestions? Other
than
his amp I don't have any way that I know of to check it.
Contact me off list if appropriate.
BTW Ten-Tec connection: he's driving it with an Orion.
TNX/73, Al
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