[Amps] L4B supply

[Carl]

You might run into plate choke heating if resonances atre close as well as 
switch arcing which seems to be common with that amp.

I thru the calculator away several times and installed a LK-500 thru 800 
complete tank in a couple of L4B's and got good 160-10M coverage including 
WARC.  The tanks were left over from 6M conversions.

If Amp Supply could get away with one tank for all the amps I said what the 
hell...!! Saved a lot of time and woked fine. Even used their plate chokes.

Carl
KM1H

----- Original Message ----- 
From: "Paul Baldock" <paul at paulbaldock.com>
To: "Carl" <km1h at jeremy.mv.com>; <amps at contesting.com>; 
<mikflathead at aol.com>
Sent: Sunday, February 16, 2014 5:16 PM
Subject: Re: [Amps] L4B supply


>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
>>>_______________________________________________
>>>Amps mailing list
>>>Amps at contesting.com
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>>
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>