I run my L4-B at 800V (no load) above the original design. 3100V key
down at .7A.1600W PEP out. It's been handling it fine for about 6
months now. I think the cooling is probably inadequate but I like to
live on the edge. The load impedance is not messed with significantly
because with the increase in voltage there is a proportional increase
in current. I did add a timer so the fans stays on for 10 mins after
power down and a few other mods.
- Paul
At 01:17 PM 2/16/2014, you wrote:
Use a transformer from an Ameritron AL-572, it will give you very
close to the original and not mess up the tubes load impedance. It
is in the MFJ catalog and reasonably priced compared the new
alternatives. The last thing to do is go overboard with voltage as
the circuit wont handle it well.
Carl
KM1H
----- Original Message ----- From: <mikflathead@aol.com>
To: <amps@contesting.com>
Sent: Sunday, February 16, 2014 3:27 PM
Subject: [Amps] L4B supply
I recently acquired a nice L4b amplifier. It has no tubes or
supply. It is in very nice condition. If you were to build the
"ultimate" supply for this what would you use for a transformer. I
would think a full wave bridge would be the way to go. Any
comments? Thanks Mike
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