[Amps] Advice please Ameritron amp

[jeremy-ca]

The AL82 is a stable and rugged amp not prone to problems.
Are both tubes lit?
What is the idle current?
With the cover off and driving see that one tube isnt getting red while the 
other plate is dark.
Is the input VSWR under 1.2?

Carl
KM1H

----- Original Message ----- 
From: "Gerold Sklott" <gsklott at yahoo.com>
To: <amps at contesting.com>
Sent: Saturday, May 26, 2007 3:01 PM
Subject: [Amps] Advice please Ameritron amp


>I just assembled a new AL82. I've had many amps in the
> past, SB220, Alpha 76PA, Titan etc. I had no problems
> loading any of my antennas with these amps.
>
> Here's my problem and I hope it has a simple answer or
> I've just forgotten something.
>
> I can key and load the AL82(driver is 1000MP about 100
> watts).  I cannot get the load anywhere near the
> recommended value. Power out peaks at very low load
> values( the opposite of what I need). For example the
> it should be in the 3 area for 40 and I get 0 or less
> than zero. Grid current is not excessive. The load
> also becomes unreactive sooner than expected, that is
> I can't push it to the higher current levels they
> suggest. I can get to 550 mils or so. So I can't do
> higher power if I wanted. I think my drive is
> sufficient.
>
> I tried a KT34a, dipole and GP and different bands. On
> 20, 40  17 etc. the load only gives max power out for
> low load values at 2-4 below what would be expected. I
> know numbers from Ameriton are estimates. But , I'm
> not close. The load is too low.
>
> The Titan that just came off line had no problem
> anywhere, any band, any antenna, always in range and
> power out fine..
>
> Hoping someone has a solution or can tell me I did
> something dumb and forgot?
>
> Tks de,
>
> Gerry K1NY
>
> gsklott at yahoo.com
>
>
>
>
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