> Why does everyone insist that the 4-1000 needs in excess of 5kV to run
> legal
> limit? I have built several that easily put out 1500W with only 4-4.5 kV
> and 100W from a solid state rig. Am I just using good tubes vs. ones near
> the end of life? Probably.
[Steve Katz] Or, the other answer might be that people are running
a good deal more than 1500W output. (Shhh, don't tell anybody.) My 4-1000A
grid-driven amp for 50 MHz runs 1500W output with <20W PEP drive, 4100V Ep
and 600V Eg2. WB2WIK/6
> I would use bandpass coax stubs to keep harmonics down with only an "L"
> network.
>
> Mike, W1NR
>
>
> -----Original Message-----
> From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
> Behalf Of Peter Chadwick
> Sent: Thursday, January 03, 2002 3:59 AM
> To: amps@contesting.com; 'wlfuqu00@uky.edu'
> Subject: RE: [AMPS] Building new 4-1000A amp
>
>
>
> I used an L network in a marine tx many years ago: the antenna load for
> test
> purposes in the 1.6 - 3.8MHz band was 10 ohms in series with 250pF, so an
> L
> network gave adequate harmonic rejection. The working Q came out at 15 in
> that
> case, so the losses were manageable. We sold several hundred of them, so I
> guess
> they can't have been too bad.
>
> I gather from what's been said here in the past that you need 5 or 6kV on
> the
> plate, but I guess you knew that already.
>
> 73
>
> Peter G3RZP
>
>
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>
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