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

[Carl]

Same problem on all bands?

Carl
KM1H


----- Original Message ----- 
From: "Steve Bookout" <steve at nr4m.com>
To: <TexasRF at aol.com>; <amps at contesting.com>
Sent: Thursday, February 19, 2015 7:40 PM
Subject: Re: [Amps] high drive/low output QRO HF-2500


> 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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>>
>
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