[Amps] Amps Digest, Vol 36, Issue 48

[Tom Martin]

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 at contesting.com>
To: <amps at 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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> ----------------------------------------------------------------------
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> Message: 1
> Date: Mon, 26 Dec 2005 08:57:00 -0800
> From: "Bob Moore" <ki6iv at sbcglobal.net>
> Subject: [Amps] FW:  AL-80b Problem?
> To: <amps at contesting.com>
> Message-ID: <MDBBLKIELFIEJGLIPBJHGEOBCPAA.ki6iv at 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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