If you think that adding a second tube double the plate load impedance....
then you don't understand how linear amplifiers work.
Now if you double the plate current, (1.8 amps, which a stock AL1500
wont do) then the plate load is half.
But the best you could hope for is 1.1 amps or perhaps a little bit
higher on CW or SSB... Then it would certaly increase.
Last time I checked, plate load is a function of plate voltage and plate
current. Nothing more... Nothing less.
Good luck getting 3600 to 4000 watts output from an AL1500.
73
Jim W7RY
On 3/23/2019 1:58 PM, Jim Thomson wrote:
From: "Carl" <km1h@jeremy.qozzy.com>
To: "Paul Christensen" <w9ac@arrl.net>, <amps@contesting.com>
Subject: Re: [Amps] Amps Digest, Vol 195, Issue 10--Replacing padder
caps on an Alpha 77DX/SX
<And also 2 holer AL-1500's which was as simple as using the AL-82 tube
<chassis and a filament transformer. W8JI pioneered that swap for his own use.
<Never had a report of any failures.
<Carl
## Very slick ! Is the oem PI net retained ? The resulting plate load Z
with
a pair of 8877s would only be one half of a single tube. The 2 holer would
require
double the tune and load C..and one half the UH on each band.
## Was an out board B+ supply used ?
Jim VE7RF
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