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

[Steve Bookout]

The K3 that is driving it shows 1.2 or 1.3 to 1 standing wave.

Steve


On 2/20/2015 00:31 , TexasRF at 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 at 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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