[Amps] L4B supply

[Paul Baldock]

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 at aol.com>
>To: <amps at 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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