[TenTec] OT: Need advice checking out a stored 3-500

[Bob McGraw - K4TAX]

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 at netecin.net>
To: "Discussion of Ten-Tec Equipment" <tentec at 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 at dejazzd.com>
> To: <wb5jnc at centurytel.net>; "Discussion of Ten-Tec Equipment" 
> <tentec at 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 at 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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