[Amps] Ameritron AL-80A

[Carl]

Ive replaced several AL-80A transformers with the 80B version, toss the 
bracket, and drill 4 holes. The original transformer is a weak link.

You can call Ameritron direct and get a revised schematic, as well as a Step 
Start upgrade sheet. IMO the step start is useless in such a small amp and 
just causes problems.

Carl
KM1H


----- Original Message ----- 
From: "Arthur Mumaw" <artrita at peoplepc.com>
To: <amps at contesting.com>
Sent: Saturday, April 30, 2011 8:10 PM
Subject: [Amps] Ameritron AL-80A


>I recently acquired an Ameritron AL-80A amplifier built in December of 
>1987,
> Serial No. 1087 and it was damaged in shipment.  I have the AL-80A 
> schematic
> but it is not at the level of this unit.  My schematic does not have the
> soft-start, a 27pf cap at the antenna bypass, a 1N4001 diode, a small 
> choke,
> two caps (.1uf, .o1uf @ 50vdc), a 10m cap from filament to ground at the
> tube socket.
>
>
>
> It also has a xmfr that appears to be the same as the AL-80B with 
> additional
> winding mounted on an aluminum bracket that is bolted to the chassis 
> bottom;
> this is the reason for all of the damage since this was a dumb idea 
> because
> it left the xmfr without any real security and was allowed to bounce 
> around
> and destroy the parts in close proximity.
>
>
>
> Also someone has tampered with the buck/boost windings and all of the
> jumpers have been removed leaving just two wires from the three in the 
> xfmr
> for buck/boost applications and there is no documentation to tell how this
> was connected.
>
>
>
> The 3-500Z tube was clobbered and is now a pile of glass and junk.  The
> person that sent the unit never removed the tube prior to shipping.
>
>
>
> So I need some help if someone can supply the correct documentation for 
> this
> unit.  This was built by the Ameritron outfit in Cleveland, Ohio,
>
>
>
> TNX  Art
>
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