Bob,
On my 80-B I have the following:
HV same readings
Grid 110
Plate 400
50 in 700 w out on 80-B wattmeter
50 in 500 w out with external wattmeter
1.3:1 Input SWR on 14.025
ALC Set 11
With 70 watts input, I get 800w out on the inboard meter and 650w out with
the external wattmeter.
Grid 150
Plate 450
ALC Set 15
I don't know how old the final tube is. I bought the amp online and it had
gone through two previous owners.
Tom W8JWN/V31TR
----- Original Message -----
From: <amps-request@contesting.com>
To: <amps@contesting.com>
Sent: Monday, December 26, 2005 11:00 AM
Subject: Amps Digest, Vol 36, Issue 48
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> 1. FW: AL-80b Problem? (Bob Moore)
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> Message: 1
> Date: Mon, 26 Dec 2005 08:57:00 -0800
> From: "Bob Moore" <ki6iv@sbcglobal.net>
> Subject: [Amps] FW: AL-80b Problem?
> To: <amps@contesting.com>
> Message-ID: <MDBBLKIELFIEJGLIPBJHGEOBCPAA.ki6iv@sbcglobal.net>
> Content-Type: text/plain; charset="windows-1250"
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>
>
>
> I am having some problems with my AL-80b. Over the past couple of weeks
the
> power out has dropped from a typical 800-900w on all bands to 500w.
> Symptoms
> include the input SWR going from 1.5 to 3.0+ (depending on band).
>
> On 14.025 the typical readings are:
>
> HV: idle 2975
> load 2800
>
> Grid: 110
> Plate: 300
>
> 100w in and 500w out
>
> Just before this problem started I did have a bang come out of the amp,
> which surprised me some
>
> I suspect the tube is failing, any other ideas..........Bob, KI6IV
>
>
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