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Re: [Amps] high drive/low output QRO HF-2500

To: TexasRF@aol.com, amps@contesting.com
Subject: Re: [Amps] high drive/low output QRO HF-2500
From: Steve Bookout <steve@nr4m.com>
Date: Fri, 20 Feb 2015 00:40:22 +0000
List-post: <amps@contesting.com">mailto:amps@contesting.com>
The K3 that is driving it shows 1.2 or 1.3 to 1 standing wave.

Steve


On 2/20/2015 00:31 , TexasRF@aol.com wrote:
90W drive; how much reflected?
73,
K5GW
In a message dated 2/19/2015 5:22:23 P.M. Central Standard Time, steve@nr4m.com writes:
    Hello all,

    Took a QRO HF-2500 out of storage and put it on my 40 meter mult
    station.

    Tuned by the book (because I never can remember how to tune this
    thing
without the book...) and the output is low at about 1050 watts. This
    is with about 90 watts of drive.  When last used it was used on 15
    only,
    but always got plenty of power out.  Efficiency looks fine at
    about 62%
    (700ma @ 2400 volts)

    As I recall, this amp used to drive full output with 35, or so, watts.

    Power doesn't drift, and tunes up easy.  It's just acting more
    like an
    SB-220 than the amp it is.

    Plate and load cap settings appear correct per the manual.

    Ideas?

    73 de Steve, NR4M
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