I believe it would; I have not studied the AL-82 schematic to confirm.
--Scott, W5WZ
On 2019-09-13 06:56, George Harlem wrote:
Wouldn’t this modification also improve the AL-82?
George W1EBI
From George's iPhone
On Sep 12, 2019, at 7:59 PM, w5wz@w5wz.com wrote:
Ray W2RE was with me in the Dayton flea market around 2010 or 2012
when I saw this AL-1200. He told me he had a couple, and they were
good contesting amps. So, I bought it. Turns out, his call sign is
again associated with this amp as I've had to repair/modify its HV
power supply and sought info online.
WARNING – LETHAL VOLTAGES!!! DO NOT ATTEMPT WITHOUT PROPER SAFETY
PRECAUTIONS!!! I’m not responsible for what you do with this
information!
The Ameritron AL-1200 has a 3,600v power supply. Its filter
capacitor bank of eight, 270mF 450vDC runs right at the limit of its
design (8 x 450 = 3600). A common modification is to add two
additional capacitors, along with the needed bleeder resistors, to
increase the filter bank capacity to 4,500v (10 x 450=4,500). Keep
in mind that the transformer still puts out 3,600v, so this
modification essentially allows the components in the filter bank to
have some overhead capacity.
W8JI and W7RY both offer a replacement PCB designed for 10
capacitors.
W1QJ described the way he modified an AL-1200 for W2RE here:
https://forums.qrz.com/index.php?threads/al-1200-power-supply-project.369641/
I choose to adopt the W1QJ method, and show how I did in the W5WZ
blog. This will also work in the AL-1500 equally well.
https://www.w5wz.com/2019/09/modify-al-1200-hv-power-supply/
--Scott, W5WZ
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